240D25-17 - OPTO 22 - Datasheet.Live

Solid-State Relays

Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com

SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com

© 2006–2017 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.

PAGE

DATA SHEET

Form 0859-170111

Solid-State Relays

Features

Rugged, epoxy encapsulation construction

4,000 volts of optical isolation

Subjected to full load test and six times the rated

current surge before and after encapsulation

Unique heat-spreader technology

Guaranteed for life

Overview

In 1974, Opto 22 introduced the first liquid epoxy-filled line of

power solid-state relays (SSR). This innovation in SSR design

greatly improved the reliability and reduced the cost of

manufacturing. At that time, we also incorporated into our

manufacturing process 100% testing under full load

conditions of every relay we produced.

By 1978, Opto 22 had gained such a reputation for reliability

that we were recognized as the world’s leading manufacturer

of solid-state relays. Through continuous manufacturing

improvements and the same 100% testing policy established

over 40 years ago, Opto 22 is still recognized today for the very

high quality and reliability of all our solid-state relays.

Description

Opto 22 offers a complete line of SSRs, from the rugged 120/

240/380-volt AC Series to the small footprint MP Series,

designed for mounting on printed circuit boards. All Opto 22

SSRs feature 4,000 volts of optical isolation, and most are UL

and CSA recognized. The innovative use of room-temperature

liquid epoxy encapsulation, coupled with Opto 22’s unique

heat-spreader technology, are key to mass producing the

world’s most reliable solid state relays.

Every Opto 22 solid state relay is subjected to full load test and

six times the rated current surge both before and after

Opto 22 Power

Series SSR

Part Numbers

Part Description

AC Switching

120A10 120 VAC, 10 Amp, AC Control

120A25 120 VAC, 25 Amp, AC Control

240A10 240 VAC, 10 Amp, AC Control

240A25 240 VAC, 25 Amp, AC Control

240A45 240 VAC, 45 Amp, AC Control

120D3 120 VAC, 3 Amp, DC Control

120D10 120 VAC, 10 Amp, DC Control

120D25 120 VAC, 25 Amp, DC Control

120D45 120 VAC, 45 Amp, DC Control

240D3 240 VAC, 3 Amp, DC Control

240D10 240 VAC, 10 Amp, DC Control

240Di10 240 VAC, 10 Amp, DC Control, with LED Indica-

tors

240D25 240 VAC, 25 Amp, DC Control

240Di25 240 VAC, 25 Amp, DC Control, with LED Indica-

tors

240D30-HS 240 VAC, 30 Amp, DC Control, with integrated

heatsink

240D45 240 VAC, 45 Amp, DC Control

240Di45 240 VAC, 45 Amp, DC Control, with LED Indica-

tors

380D25 380 VAC, 25 Amp, DC Control

380D45 380 VAC, 45 Amp, DC Control

480D10-12 480 VAC, 10 Amp, DC Control, Transient Proof

480D15-12 480 VAC, 15 Amp, DC Control, Transient Proof

480D25-12 480 VAC, 25 Amp, DC Control, Transient Proof

480D25-HS 480 VAC, 25 Amp, DC Control, Transient Proof,

with integrated heatsink

480D45-12 480 VAC, 45 Amp, DC Control, Transient Proof

575D15-12 575 VAC, 15 Amp, DC Control, Transient Proof

575D45-12 575 VAC, 45 Amp, DC Control, Transient Proof

575D30-HS 575 VAC, 30 Amp, DC Control, Transient Proof,

with integrated heatsink

575Di45-12 575 VAC, 45 Amp, DC Control, Transient Proof,

with LED Indicators

MP120D2

or P120D2

120 VAC, 2 Amp, DC Control.

P model is low profile.

MP120D4

or P120D4

120 VAC, 4 Amp, DC Control.

P model is low profile.

MP240D2

or P240D2

240 VAC, 2 Amp, DC.

P model is low profile.

MP240D4

or P240D4

240 VAC, 4 Amp, DC.

P model is low profile.

MP380D4 380 VAC, 4 Amp, DC

Z120D10 Z Model, 120 VAC, 10 Amp, DC Control

Z240D10 Z Model, 240 VAC, 10 Amp, DC Control

DC Switching

DC60P or

DC60MP

60 VDC, 3 Amp, DC Control.

P model is low profile.

DC200P or

DC200MP

200 VDC, 1 Amp, DC Control.

P model is low profile.

DC60S-3 60 VDC, 3 Amp, DC Control

DC60S-5 60 VDC, 5 Amp, DC Control

Accessories

SAFETY COVER Power Series SSR safety cover

SSR-HS Power Series SSR heatsink

SSR-THERMOPAD Thermal conductive pad (pack of 10)

Part Description

AC Switching

Solid-State Relays

Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com

SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com

Solid-State Relays

PAGE

DATA SHEET

Form 0859-170111

encapsulation. This double testing of every part before it

leaves the factory means you can rely on Opto 22 solid state

relays. All Opto 22 SSRs are guaranteed for life.

Accessories for the Power-Series SSRs include a safety cover, a

heatsink, and a matching thermal conductive pad. See page 3.

Power Series SSRs

Opto 22 provides a full range of

Power Series relays with a wide

variety of voltage (120–575 volts)

and current options (3–45 amps).

All Power Series relays feature 4,000

volts of optical isolation and have a

high PRV rating. Some Power Series

relays include built-in LEDs to

indicate operation.

See page 4.

DC Series

The DC Series delivers isolated DC control to large OEM

customers worldwide. All DC control SSRs are LS TTL

compatible.

AC Series

The AC Series offers the ultimate in solid state reliability. All AC

Power Series relays feature a built-in snubber as well as zero-

voltage turn-on and zero-current turn-off. Transient-proof

models offer self protection for noisy electrical environments.

Z Series SSRs

The Z Series employs a unique heat

transfer system that makes it

possible for Opto 22 to deliver a

low-cost, 10-amp, solid state relay

in an all-plastic case. The push-on,

tool-free quick-connect terminals

make the Z Series ideal for high-

volume OEM applications.

Operating temperature: –40 °C to

100 °C. See page 7.

Printed Circuit Series SSRs

Opto 22’s Printed Circuit Series

allows OEMs to easily deploy solid

state relays on printed circuit

boards. Two unique packages are

available, both of which will switch

loads up to four amps. Operating

temperature: –40 °C to 100 °C. See

page 9.

MP Series

The MP Series packaging is designed with a minimum

footprint to allow maximum relay density on the printed

circuit board.

P Series

The P Series power relays provide low-profile [0.5 in.

(12.7 mm)] center mounting on printed circuit boards.

HS Series SSRs

The HS Series features an integrated

heatsink, which makes themsocool.

These relays have less thermal

resistance inside, so heat dissipates

more easily than in a standard SSR

mounted to the same heatsink. With

the heatsink built-in, you don't have

to select one from a catalog, and

installation is much easier.Includes a

DIN-rail adapter. See page 13.

Specifications

(all Power Series models)

•4,000 V optical isolation, input to output

•Zero voltage turn-on

•Zero-current turn-off

•Turn-on time: 0.5 cycle maximum

•Turn-off time: 0.5 cycle maximum

•Operating temperature: –40 °C to 100 °C

•Operating frequency: 25 to 65 Hz

(operates at 400 Hz with six times off-state leakage)

•Coupling capacitance, input to output: 8 pF maximum

•Hermetically sealed

•DV/DT Off-state: 200 volts per microsecond

•DV/DT commutating: snubbed for rated current at

0.5 power factor

•UL recognized

•CSA certified

•CE component

•Torque specs for screws (this spec is both the

recommended torque and the maximum torque you

should use):

Control terminals, 10 in-lb (1.13 N-m)

Field terminals, 18 in-lb (2.03 N-m)

Solid-State Relays

Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com

SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com

Solid-State Relays DATA SHEET

Form 0859-170111

PAGE

Power Series SSR Accessories

Safety Cover

A plastic safety cover (Opto 22 part number SAFETY COVER) is

available for use with Opto 22 Power Series SSRs. The safety

cover reduces the chance of accidental contact with relay

terminals, while providing access holes for test

instrumentation.

SSR-HS Heatsink

Custom designed for the Power Series SSRs, the SSR-HS

heatsink provides excellent heat dissipation when mounted to

the SSR with a matching thermal conductive pad, used in

place of silicon grease. One thermal pad is included with the

heatsink. Additional pads may be purchased in packs of 10

(part number SSR-THERMOPAD). DIN-rail adapter is included.

Thermal Ratings

The thermal ratings shown in the following graphs were

obtained with an SSR attached to a heatsink using a thermal

conductive pad.

45 Amp Relay on SSR-HS Heatsink Derating

25 Amp Relay on SSR-HS Heatsink Derating

Heatsink Assembly

Before attaching the SSR, remove the protective film from

both sides of the thermal pad, then place the pad on the

heatsink making sure to align the holes. Secure the SSR to the

heatsink with the two 8-32 x 3/8˝ panhead Phillips screws

included in the kit. Use 20 in-lb (2.26 N-m) of torque.

An optional plastic safety cover can be installed on a Power Series SSR.

30 40 50 60 70 80 90 10020

Ambient Temperature (°C)

RMS Amperes

V: Heatsink mounted to a vertical surface

H: Heatsink mounted to a horizontal surface.

30 40 50 60 70 80 90 10020

Ambient Temperature (°C)

RMS Amperes

V: Heatsink mounted to a vertical surface

H: Heatsink mounted to a horizontal surface.

Screws

Thermal conductive pad

Power Series SSR

(not included)

Heatsink

NOTE: To take advantage of the

cooling effect of natural air flow,

mount the SSR/heatsink assembly to

a vertical surface with the Opto 22

logo right side up as shown here.

Solid-State Relays

Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com

SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com

Solid-State Relays

PAGE

DATA SHEET

Form 0859-170111

AC Power Series Specifications

Opto 22 provides a full range of Power Series relays with a wide variety of voltage (120–575) and current options (3–45 amps). All

Power Series relays feature 4,000 volts of optical isolation and have a high PRV rating. Operating temperature is –40 °C to 100 °C.

Connection Diagram

rent Control varies with control voltage. See “Control

ent Calculation” on page 17 for information.

Model

Number

Nominal

AC Line

Vol ta ge

Nominal

Current

Rating

(Amps)

1 cycle

Surge

(Amps)

Peak

Nominal

Signal Input

Resistance

(Ohms)

Signal

Pick-up

Voltage

Signal

Drop-

out

Voltage

Peak

Repetitive

Vol ta ge

Maximum

Output

Volta ge

Drop

Off-State

Leakage

(mA)

Maximum**

Operating

Vol ta ge

Range

(Volts AC)

Rating

t=8.3

(ms)

Isolation

Voltage



jc*

(°C/Watt)

Dissipation

(Watts/

Amp)

120D3

120 3 85 1000 3VDC

(32V allowed)

1 VDC 600 1.6 volts 2.5mA 12–140 30 4,000V

RMS

11 1.7

120D10

120 10 110 1000 3VDC

(32V allowed)

1 VDC 600 1.6 volts 7 mA 12–140 50 4,000V

RMS

1.3 1.6

120D25

120 25 250 1000 3VDC

(32V allowed)

1 VDC 600 1.6 volts 7 mA 12–140 250 4,000V

RMS

1.2 1.3

120D45

120 45 650 1000 3VDC

(32V allowed)

1 VDC 600 1.6 volts 7 mA 12–140 1750 4,000V

RMS

0.67 0.9

240D3

240 3 85 1000 3VDC

(32V allowed)

1 VDC 600 1.6 volts 5 mA 24–280 30 4,000V

RMS

11 1.7

240D10

240 10 110 1000 3VDC

(32V allowed)

1 VDC 600 1.6 volts 14 mA 24–280 50 4,000V

RMS

1.3 1.6

240Di10

240 10 110 730 3VDC

(32V allowed)

1 VDC 600 1.6 volts 14 mA 24–280 50 4,000V

RMS

1.3 1.6

240D25

240 25 250 1000 3VDC

(32V allowed)

1 VDC 600 1.6 volts 14 mA 24–280 250 4,000V

RMS

1.2 1.3

240Di25

240 25 250 730 3VDC

(32V allowed)

1 VDC 600 1.6 volts 14 mA 12–280 250 4,000V

RMS

1.2 1.3

240D45

240 45 650 1000 3VDC

(32V allowed)

1 VDC 600 1.6 volts 14 mA 24–280 1750 4,000V

RMS

0.67 0.9

240Di45

240 45 650 730 3VDC

(32V allowed)

1 VDC 600 1.6 volts 14 mA 24–280 1750 4,000V

RMS

0.67 0.9

380D25

380 25 250 1000 3VDC

(32V allowed)

1 VDC 800 1.6 volts 12 mA 24–420 250 4,000V

RMS

1.2 1.3

380D45

380 45 650 1000 3VDC

(32V allowed)

1 VDC 800 1.6 volts 12 mA 24–420 1750 4,000V

RMS

0.67 0.9

120A10

120 10 110 33K 85VAC

(280V allowed)

10 VAC 600 1.6 volts 7 mA 12–140 50 4,000V

RMS

1.3 1.6

120A25

120 25 250 33K 85VAC

(280V allowed)

10 VAC 600 1.6 volts 7 mA 12–140 250 4,000V

RMS

1.2 1.3

240A10

240 10 110 33K 85VAC

(280V allowed)

10 VAC 600 1.6 volts 14 mA 24–280 50 4,000V

RMS

1.3 1.6

240A25

240 25 250 33K 85VAC

(280V allowed)

10 VAC 600 1.6 volts 14 mA 24–280 250 4,000V

RMS

1.2 1.3

240A45

240 45 650 33K 85VAC

(280V allowed)

10 VAC 600 1.6 volts 14 mA 24–280 1750 4,000V

RMS

0.67 0.9

Note:



jc* = Thermal resistance from internal junction to base. Maximum internal junction temperature is 110 °C.

** Operating Frequency: 25 to 65 Hz (operates at 400 Hz with 6 times the offstate leakage)

120/240/380 Volt

Connection Diagram, DC Power Series

*Control Current varies with control voltage. See “Control

Current Calculation” on page 17 for information.

NOTE: Model numbers ending in -17 are replacement parts only. Their specifications are identical

to the same model number without the -17. For example, 240D10-17 is identical to 240D10.

Solid-State Relays

Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com

SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com

Solid-State Relays DATA SHEET

Form 0859-170111

PAGE

120/240/380 Volt (cont.)

Surge Current Data

Connection Diagram, AC Power Series

Thermal Ratings

Time

(Seconds)

Time*

(Cycles)

3-Amp

Peak

Amps

10-Amp

Peak

Amps

25-Amp

Peak

Amps

45-Amp

Peak

Amps

0.017 1 85 110 250 650

0.050 3 66 85 175 420

0.100 6 53 70 140 320

0.200 12 45 60 112 245

0.500 30 37 50 80 175

1 60 31 40 67 134

2 120 28 33 53 119

3 180 27 32 49 98

4 240 26 31 47 95

5 300 25 30 45 91

10 600 24 28 42 84

Note: *60 HZ.

Mounted on a heat sink with

2 °C/watt rating

Mounted on a heat sink with

1 °C/watt rating

Side view: Part numbers

DC60S3, 120D3, and

240D3 only

Side view: All other

part numbers

3-32VDC Control

Dimensional Drawings

NOTE: All dimensions are nominal. We do not recommend mounting the terminal side of the SSR to a flat PCB (printed circuit board) or

other flat surface, because there may be some variation in terminal height from one terminal to another and from one SSR to another.

Solid-State Relays

Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com

SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com

Solid-State Relays

PAGE

DATA SHEET

Form 0859-170111

480/575 Volt

Surge Current Data Thermal Ratings

Model

Number

Nominal

AC Line

Volta ge

Nominal

Current

Rating

(Amps)

1 cycle

Surge

(Amps)

Peak

Nominal

Signal Input

Resistance

(Ohms)

Signal

Pick-up

Vol ta ge

Signal

Drop-

out

Volta ge

Peak

Repetitive

Vol ta ge

Maximum

Output

Voltage

Drop

Off-State

Leakage

(mA)

Maximum**

Operating

Vol ta ge

Range

(Volts AC)

Rating

t=8.3

(ms)

Isolation

Volta ge



jc*

(°C/Watt)

Dissipation

(Watts/Amp)

480D10-12

480 10 110 1000 3VDC

(32V allowed)

1 VDC 1200 3.2 volts 11 mA 100–530 50 4,000V

RMS

1.2 2.5

480D15-12

480 15 150 1000 3VDC

(32V allowed)

1 VDC 1200 3.2 volts 11 mA 100–530 50 4,000V

RMS

1.2 2.5

480D25-12

480 25 250 1000 3VDC

(32V allowed)

1 VDC 1000 1.6 volts 11 mA 100–530 250 4,000V

RMS

1.3 1.3

480D45-12

480 45 650 1000 3VDC

(32V allowed)

1 VDC 1000 1.6 volts 11 mA 100–530 1750 4,000V

RMS

0.67 0.9

575D15-12

575 15 150 1000 3VDC

(32V allowed)

1 VDC 1200 3.2 volts 15 mA 100–600 90 4,000V

RMS

1.2 2.5

575D45-12

575 45 650 1000 3VDC

(32V allowed)

1 VDC 1000 1.6 volts 15 mA 100–600 1750 4,000V

RMS

0.67 0.9

575Di45-12

575 45 650 730 3VDC

(32V allowed)

1 VDC 1000 1.6 volts 15 mA 100–600 1750 4,000V

RMS

0.67 0.9

Note:



jc* = Thermal resistance from internal junction to base. Maximum internal junction temperature is 110 °C.

** Operating Frequency: 25 to 65 Hz (operates at 400 Hz with 6 times the offstate leakage)

Time

Second

Time***

(Cycles)

10-Amp

Peak

Amps

15-Amp

Peak

Amps

25-Amp

Peak

Amps

45-Amp

Peak

Amps

0.017 1 110 150 250 650

0.050 3 85 140 175 420

0.100 6 70 110 140 320

0.200 12 60 90 112 245

0.500 30 50 70 80 175

1 60 40 55 67 134

2 120 33 49 53 119

3 180 32 47 49 98

4 240 31 43 47 95

5 300 30 40 45 91

10 600 28 35 42 84

Note: ***60 HZ

Mounted on a heat sink with

1 °C/watt rating

Mounted on a heat sink with

2 °C/watt rating

Solid-State Relays

Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com

SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com

Solid-State Relays DATA SHEET

Form 0859-170111

PAGE

480/575 Volt (cont)

Dimensional Drawings

Z Series Specifications

AC Power: 120/240 Volt

The Z Series employs a unique heat transfer system that makes it possible for Opto 22 to deliver a low-cost, 10-amp, solid-state

relay in an all-plastic case. The push-on tool-free quick-connect terminals make the Z Series ideal for high-volume OEM

applications. Operating temperature is –40 °C to 100 °C.

Side view: Part numbers

DC60S3, 120D3, and

240D3 only

Side view: All other

part numbers

3-32VDC Control

NOTE: All dimensions are nominal. We do not recommend mounting the terminal side of the SSR to a flat PCB (printed circuit board) or

other flat surface, because there may be some variation in terminal height from one terminal to another and from one SSR to another.

Z120D10 Z240D10

Nominal AC Line Voltage Nominal 120 240

Current Rating (Amps) 10 10

1 cycle Surge (Amps) Peak 110 110

Nominal Signal Input Resistance (Ohms) 1000 1000

Signal Pick-up Voltage 3VDC (32V

allowed)

3VDC (32V

allowed)

Signal Drop-out Voltage 1 VDC 1 VDC

Peak Repetitive Voltage Maximum 600 600

Maximum Output Voltage Drop 1.6 volts 1.6 volts

Off-State Leakage (mA) Maximum** 6 mA 12 mA

Operating Voltage Range (Volts AC) 12–140 24–280

I2t Rating t=8.3 (ms) 50 50

Isolation Voltage 4,000 VRMS 4,000 VRMS

jc* (°C/Watt) Dissipation (Watts/Amp) 4 4

Notes: jc* = Thermal resistance from internal junction to base. Maximum internal junc-

tion temperature is 110°C.

** Operating Frequency: 25–65 Hz (operates at 400 Hz with 6 times the offstate leakage)

NOTE: Part number Z240D10-17 is a

replacement part only. Its specifications

are identical to Z240D10.

Solid-State Relays

Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com

SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com

Solid-State Relays

PAGE

DATA SHEET

Form 0859-170111

AC Power: 120/240 Volt (cont.)

Connection Diagram

Current vs. Ambient Ratings Surge Current Data

Mounted on a heat sink with

2 °C/watt rating

*Control Current varies with control voltage. See “Control

Current Calculation” on page 17 for information.

Dimensional Drawings

NOTE: All dimensions are nominal. We do not

recommend mounting the terminal side of the SSR to

a flat PCB (printed circuit board) or other flat surface,

because there may be some variation in terminal

height or alignment from one terminal to another

and from one SSR to another.

Solid-State Relays

Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com

SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com

Solid-State Relays DATA SHEET

Form 0859-170111

PAGE

Printed Circuit Series Specifications

AC Power: MP and P Series

The MP Series packaging is designed with a minimum

footprint to allow maximum relay density on the printed

circuit board. The P Series power relays provide low-profile for

0.5-inch (12.7 mm) center mounting on printed circuit boards.

Operating temperature: –40 °C to 100 °C.

Connnection Diagram

MP120D2

or P120D2

MP120D4

or P120D4

MP240D2

or P240D2

MP240D4

or P240D4 MP380D4

Nominal AC Line Voltage 120 120 240 240 380

Nominal Current Rating

Amps 24244

1 cycle Surge (Amps)

Peak 20 85 20 85 85

Nominal Signal Input

Resistance (Ohms) 1000 1000 1000 1000 1000

Signal Pick-up Voltage 3VDC***

(24V allowed)

3VDC***

(24V allowed)

3VDC***

(24V allowed)

3VDC***

(24V allowed)

3VDC***

(24V allowed)

Signal Drop-out Voltage 1 VDC 1 VDC 1 VDC 1 VDC 1 VDC

Peak Repetitive Voltage

Maximum 600 600 600 600 800

Maximum Output Volt-

age Drop 1.6 volts 1.6 volts 1.6 volts 1.6 volts 1.6 volts

Off-State Leakage mA

Maximum** 5 mA 5 mA 5 mA 5 mA 5 mA

Operating Voltage

Range (Volts AC) 12–140 12–140 24–280 24–280 24–420

I2t Rating t=8.3 (ms) 2 30 2 30 30

Isolation Voltage 4,000 VRMS 4,000 VRMS 4,000 VRMS 4,000 VRMS 4,000 VRMS

jc* °C/Watt 20 6.5 20 6.5 6.5

Dissipation Watts/Amp 1.2 1.2 1.2 1.2 1.2

Rating (Motor Load) 1 FLA at 120 VAC

6 LRA at 120 VAC

2.5 FLA at 240 VAC

6 LRA at 240 VAC

1 FLA at 120 VAC

15 LRA at 120 VAC

2.5 FLA at 240 VAC

15 LRA at 240 VAC

2.5 FLA at 380 VAC

15 LRA at 380 VAC

Notes: jc* = Thermal resistance from internal junction to base. Maximum internal junction temperature is 110 °C.

** Operating Frequency: 25 to 65 Hz (operates at 400 Hz with 6 times the offstate leakage)

*** = P Series 32 volts maximum.

*Control Current varies with control

voltage. See “Control Current

Calculation” on page 17 for information.

NOTE: Part numbers ending in -17 are

replacement parts only. Their specifica-

tions are identical to the same part num-

ber without the -17. For example,

P240D4-17 is identical to P240D4.

Solid-State Relays

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Solid-State Relays

PAGE

DATA SHEET

Form 0859-170111

AC Power: MP and P Series (cont.)

Thermal Ratings

Dimensional Drawings

NOTE: All dimensions are nominal.

Surge Current Data

Time

(Seconds)

Time*

(Cycles)

2-Amp

Peak Amps

4-Amp

Peak Amps

0.017 1 20 85

0.050 3 18 66

0.100 6 15 53

0.200 12 11 45

0.500 30 9 37

1608.5 31

2 120 8 28

3 180 7.5 27

4 240 7 26

5 300 6.5 25

10 600 6 24

Note: *60 Hz

Solid-State Relays

Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com

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Solid-State Relays DATA SHEET

Form 0859-170111

PAGE

DC Switching Series Specifications

Model DC60MP Basic Schematic (also applies to the other SSRs on this page)

NOTE: When controlling an inductive load, like a solenoid or coil, a commutating diode

must be used. Install the commutating diode across the terminals of the load (not the

SSR terminals). This will protect the SSR from damage caused by voltage spikes when

turning off the load.

DC60P

or DC60MP

DC200P or

DC200MP DC60S-3 DC60S-5

Operating Voltage

Range 5–60 VDC 5–200 VDC 5–60 VDC 5–60 VDC

Forward Voltage Drop 1.5 volts

at 3 amps

1.5 volts

at 1 amp

1.5 volts

at 3 amps

1.5 volts

at 5 amps

Nominal Currrent Rating 3 amps 1 amp 3 amps 5 amps

Off-State Blocking 60 VDC 250 VDC 60 VDC 60 VDC

Signal Pickup Voltage

3 VDC

32 Volts*

allowed

3 VDC

32 Volts*

allowed

3 VDC

32 Volts

allowed

3 VDC

32 Volts

allowed

Signal Dropout Voltage 1 VDC 1 VDC 1 VDC 1 VDC

Signal Input Impedance 1,000 ohms 1,000 ohms 1,000 ohms 1,000 ohms

1 Second Surge 5 amps 2 amps 5 amps 10 amps

Operating Temp. Range –40 °C to

100 °C

–40 °C to

100 °C

–40 °C to

100 °C

–40 °C to

100 °C

Isolation Voltage 4,000 VRMS 4,000 VRMS 4,000 VRMS 4,000 VRMS

Off-State Leakage 1 mA

maximum

1 mA

maximum

1 mA

maximum

1 mA

maximum

Package Type P/MP series P/MP series Power

series

Power

series

Turn-on Time 100 usec 100 usec 100 usec 100 usec

Turn-off Time 750 usec 750 usec 750 usec 750 usec

Note: *MP series maximum allowed control signal is 24 VDC.

Thermal Ratings

Mounted on a heat sink with

2 °C/watt rating

*Control Current varies with control voltage. See “Control

Current Calculation” on page 17 for information.

Solid-State Relays

Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com

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Solid-State Relays

PAGE

DATA SHEET

Form 0859-170111

Dimensional Drawings

NOTE: All dimensions are nominal. We do not recommend

mounting the terminal side of a Power Series or Z series SSR to a

flat PCB (printed circuit board) or other flat surface, because there

may be some variation in terminal height or alignment from one

terminal to another and from one SSR to another.

MP series and P series are designed to mount on PCBs.

Side view: Part numbers DC60S3,

120D3, and 240D3 only

Side view: All other part numbers

(+)

(+) (+)

(+)

Solid-State Relays

Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com

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Solid-State Relays DATA SHEET

Form 0859-170111

PAGE

HS Series Specifications

The HS Series features an integrated heatsink, which makes themsocool.Because there isless thermal resistance internal to the

unitthan in a standard SSR mounted to the same heat sink, heat dissipates more easily. The built-in heatsink means you don't

have to select a heatsink, and installation is much easier. Each HS-series SSR has built-in hardware for screw mounting and a built-

in DIN-rail adapter clip for mounting to a 35mm DIN rail.

Surge Current Data, Peak Amps

Model Number 240D30-HS 480D25-HS 575D30-HS

Nominal AC Line Voltage 240 480 575

Operating Voltage Range (Volts AC) 24–280 100–530 100–600

Peak Repetitive Voltage Maximum 600 1000 1200

Off-State Leakage (mA) Maximum** 5 mA 10 mA 12 mA

Nominal Output Voltage Drop (RMS) 1.0 volts 1.0 volts 1.0 volts

Nominal Current Rating (Amps) 30 25 30

1 cycle Surge (Amps) Peak 610 610 610

I2t Rating t=8.3 (ms) 1550 1550 1550

Isolation Voltage (transient 4KV) 2,500VRMS 2,500VRMS 2,500VRMS

Dissipation (Nominal Watts/Amp) 1.0 1.0 1.0

Signal Pick-up Voltage 4VDC

(32V allowed)

4VDC

(32V allowed)

4VDC

(32V allowed)

Signal Drop-out Voltage 1 VDC 1 VDC 1 VDC

Nominal Signal Input Resistance (Ohms) 730 1000 1000

ja* (°C/Watt) 2.2 2.2 2.2

Note: ja* = Thermal resistance from internal junction to ambient. Maximum internal junction

temperature is 110 °C.

** Operating Frequency: 25 to 65 Hz (operates at 400 Hz with 6 times the offstate leakage)

Time

Second 60HZ 50HZ

0.0167 610 580

0.05 394 375

0.1 300 386

0.2 230 219

0.5 164 156

1 126 120

2 112 106

39287

48985

58581

10 79 75

Solid-State Relays

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Solid-State Relays

PAGE

DATA SHEET

Form 0859-170111

HS-series (cont.)

Thermal Ratings

A: Single relay or with 0.75” spacing between relays. Derate above 40 °C; subtract 0.5 amp/°C.

B: Three relays side by side with 0.25” spacing. All relays with the same load. Derate above 40 °C; subtract 0.4 amp/°C.

30 40 50 60 70 80 90 10020

Ambient Temperature (°C)

30 Amp Models

RMS Amperes

30 40 50 60 70 80 90 10020

Ambient Temperature (°C)

25 Amp Models

RMS Amperes

NOTE: This data is for SSRs mounted to a horizontal surface. To take advantage

of the cooling effect of natural air flow, we recommend mounting HS-series SSRs

to a vertical surface with the Opto 22 logo right side up as shown here.

3.21" (81.6 mm)

3.90" (99.1 mm)

3.50" (88.9 mm) 0.20" (5.1 mm)

1.25"

(31.8 mm)

4.81"

(122.2 mm)

1.75"

(44.5 mm)

0.25"

(6.4 mm)

Dimensional Drawing

Solid-State Relays

Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com

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Solid-State Relays DATA SHEET

Form 0859-170111

PAGE

Applications: Tips

Heat Sink Calculation

Like all semiconductor devices, SSR current ratings must be based on maximum internal junction temperature. All Opto 22 SSRs

operate conservatively at maximum internal junction temperatures of 110 °C. Use the equation below to calculate the maximum

allowable heat sink thermal resistance for your application. It is good engineering practice to provide a margin for error instead of

running the application right at the limits. If your application is near the thermal limit, it can be helpful to add a fan to move air

across the heat sink.

IMPORTANT: Thermally conductive grease must be used between the relay base and the heat sink.

Sample Calculation 1

120-volt, 20-amp load; 50 °C ambient air temperature

Model: 120D25 SSR.

See the last two columns of the table on page 4 for thermal resistance and dissipation values for the 120D25. Also, see the note at

the bottom of the table.

Dissipation: 1.3 watts/amp

Thermal resistance: 1.2 °C/watt

Maximum junction temperature: 110 °C

The calculation would be as follows:

This calculation indicates that you

should select a heat sink with a thermal

resistance of less than 1.1 °C/watt.

Solid-State Relays

Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com

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Solid-State Relays

PAGE

DATA SHEET

Form 0859-170111

Sample Calculation 2

240-volt,18-amp load, 25 °C ambient air temperature

Model: 240D45

See the last two columns of the table on page 4 for thermal resistance and dissipation values for the 240D45. Also, see the note at

the bottom of the table.

Dissipation: 0.9 watts/amp

Thermal resistance: 0.67 °C/watt

Maximum junction temperature: 110 °C

The calculation would be as follows:

Duty Cycle Calculation

When solid-state relays are operated in an on/off mode, it may be advantageous to calculate the RMS value of the current through

the SSR for heat sinking or determining the proper current rating of the SSR for the given application.

This calculation indicates that you should

select a heat sink with a thermal resistance

of less than 4.6 °C/watt.

IRMS = RMS value of load or SSR

T1 = Time current is on

T2 = Time current is off

ION = RMS value of load current during on period

I RMS =

T1 + T2

(ION)2 x T1

Solid-State Relays

Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com

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Solid-State Relays DATA SHEET

Form 0859-170111

PAGE

Transformer Loads

Careful consideration should be given to the selection of the

proper SSR for driving a given transformer. Transformers are

driven from positive saturation of the iron core to negative

saturation of the core each half cycle of the alternating

voltage. Large inrush currents can occur during the first half

cycle of line voltage if a zero-voltage SSR happens to turn on

during the positive half cycle of voltage when the core is

already in positive saturation. Inrush currents greater than 10

times rated transformer current can easily occur. The following

table provides a guide for selecting the proper SSR for a given

transformer rating.

Solenoid Valve and Contactor Loads

All Opto 22 SSRs are designed to drive inductive loads such as

solenoid valves and electromechanical contactors. The built-in

snubber in each SSR assures proper operation into inductive

loads. The following table is a guide in selecting an SSR to

drive a solenoid or contactor.

Control Current Calculation

All Opto 22 DC-controlled SSRs have a control circuit

consisting of 1000 ohms in series with an Optocoupler LED.

The LED will drop 1 volt, so the voltage across the internal

resistor will be 1 volt less than the control voltage.

The control current (IC ) can be calculated from the control

voltage (VC ) as follows:

IC = (VC - 1)/1000

Examples:

3 VDC control voltage:

IC = (3 - 1)/1000 = 0.002 A (2 mA)

32 VDC control voltage:

IC = (32 - 1)/1000 = 0.031 A (31 mA)

For control voltages above 32 VDC, an external resistor can be

added in series with the SSR to limit the control current. Also, if

the device driving the control current to the SSR is limited, you

can limit the control current by using an external resistor (Re).

IC = (VC - 1)/ (Re + 1000)

Re = [(VC - 1)/(IC)] -1000

To limit the control current to 2 mA, this simplifies to:

Re = 500 (VC - 3)

120-Volt Coils

SSR CURRENT

RATING SOLENOID CONTACTOR

2- Amp 1-Am p NEMA Size 4

4-Amp 3-Amp NEMA Size 7

240-Volt Coils

SSR CURRENT

RATING SOLENOID CONTACTOR

2- Amp 1-Am p NEMA Size 7

4-Amp 3-Amp NEMA Size 7

Solid-State Relays

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Solid-State Relays

PAGE

DATA SHEET

Form 0859-170111

Opto 22 SSRs for controlling single-phase motors are shown in

the following tables:

Solid-State Relays in Series

In applications requiring higher voltage, two Opto 22 SSRs

may be operated in series for double the voltage rating. The

built-in snubber in each SSR assures proper voltage sharing of

the two SSRs in series. In the following diagram, two 240-volt,

45-amp SSRs are connected in series for operation on a 480-

volt line. The control is shown with a parallel hook-up but it

should be noted that a serial connection can also be

implemented.

Lamp Loads

Since all Opto 22 AC output SSRs use zero-voltage turn-on, they

are ideal for driving incandescent lamps, because the initial

inrush current into a cold filament is reduced. The life of the

lamp is increased when switched by a zero-voltage turn-on SSR.

The following table is a guide to selecting an Opto 22 SSR for

switching a given incandescent lamp.

120-Volt Single-Phase

Non-Reversing Motors

SSR Model MOTOR RATING

P or MP120D2 1 Amp

Z120D10 1/4 HP

120D3 1-1/2 Amp

P or MP120D4 1-1/2 Amp

120D10 o r 120A10 1/4 HP

120D25 o r 120A25 1/3 HP

120D45 3/4 HP

240-Volt Single Phase

Non-Reversing Motors

SSR Model MOTOR RATING

P or MP240D2 1 Amp

Z2 40D10 1/4 HP

240D3 1-1/2 Amp

P or MP240D4 1-1/2 Amp

240D10 or 240A10 1/3 HP

240D25 or 120A25 1/2 HP

240D45 1-1/2 HP

120-Volt Single-Phase

Reversing Motors

SSR Model MOTOR RATING

P or M P24 0D2 1 Amp

Z240D10 1/4 HP

240D3 1-1/2 Amp

P or MP240D4 1-1/2 Amp

240D10 or 240A10 1/4 HP

240D25 or 120A25 1/3 HP

240D45 3/4 HP

240-Volt Single-Phase

Reversing Motors

SSR Model MOTOR RATING

480D10-12 1/4 HP

480D15-12 1/4 HP

120 Volt Lamps

SSR CURRENT RATING LAMP RATING

2-Amp 100 Watt

4-Amp 400 Watt

10-Amp 1 Kilowatt

25-Am p 2 Kilow att

45-Amp 3 Kilowatt

240 Volt Rating

SSR CURRENT RATING LAMP RATING

2-Amp 200 Watt

4-Amp 800 Watt

10-Amp 2 Kilowatt

25-Am p 4 Kilow att

45-Amp 6 Kilowatt

Solid-State Relays

Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com

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Solid-State Relays DATA SHEET

Form 0859-170111

PAGE

Heater Loads

Care should be taken in selecting a SSR for driving a heater

load if the load is cycled on and off in a continuous manner as

might occur in a temperature control application. Constant

cycling can cause thermal fatigue in the thyristor chip at the

point where the chip bonds to the lead frame. Opto 22

employs a thick copper lead frame for mounting the SCR chips

in the power series SSRs to eliminate thermal fatigue failures.

In addition, Opto 22 recommends operating any SSR at 75%

rated current for cycling heater loads to ensure complete

reliability.

The following table is a guide to selecting the proper SSR for a

given heater load.

Single-Phase Reversing Motor Control

The circuit diagram below illustrates a typical 1 Ø motor

winding inductance and the phase shift capacitor can cause

twice-line voltage to appear across the open SSR. A 240-volt

SSR should be used for a 120-volt line. During the transition

period when one SSR is turned on and the other SSR is going

off, both SSRs may be on. In this case, the capacitor may

discharge through the two SSRs, causing large currents to

flow, which may destroy the SSRs. The addition of RL as shown

will protect the SSRs from the short circuit capacitor discharge

current.

Single-Phase Reversing Motor Control (cont.)

The resistors are unnecessary if the control circuit is designed

to ensure that one SSR is off before the other SSR is on.

Three-Phase Motor Control

Three-phase motors may be controlled by solid-state relays as

shown. A third SSR as shown is optional, but not necessary.

The control windings may be connected in series or parallel.

Care should be taken to ensure that the surge current drawn

by the motor does not exceed the surge current rating of the

SSR.

Nominal SSR

Current Rating

Maximum

Recommended

Heater Current

2-Amp 1½-Amp

4-Amp 2½-Amp

10-Amp 7½-Amp

25-Amp 18-Amp

45-Amp 35-Amp

10 480V 8-Amp

240 Volt Three-Phase Motor

SSR MODEL MOTOR

Z240D10 3/4 HP

240D10 3/4 HP

240A10 3/4 HP

240D25 2 HP

240A25 2 HP

240D45 3 HP

Solid-State Relays

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Solid-State Relays

PAGE

DATA SHEET

Form 0859-170111

Three-Phase Reversing Motor Control

Three-phase reversing motor control can be implemented

with four SSRs as shown in the connection diagram. The SSRs

work in pairs with SSR1 and SSR3 operated for rotation in one

direction and SSR2 and SSR4 operated for rotation in the

reverse direction. The resistor R1 as shown in the connection

diagram protects against line-to-line shorts if SSR1 and SSR4

or SSR3 and SSR2 are on at the same time during the reversing

transition period. Use the following table as a guide to the

proper selection of an SSR for this application.

FAQ: SSR Applications

Q : What is a solid-state relay?

A: A solid-state relay (SSR) is a semiconductor device that can

be used in place of a mechanical relay to switch electricity to a

load in many applications. Solid-state relays are purely

electronic, normally composed of a low current “control” side

(equivalent to the coil on an electromechanical relay) and a

high-current load side (equivalent to the contact on a

conventional relay). SSRs typically also feature electrical

isolation to several thousand volts between the control and

load sides. Because of this isolation, the load side of the relay is

actually powered by the switched line; both line voltage and a

load (not to mention a control signal) must be present for the

relay to operate.

Q : What are the advantages of using an SSR over a

mechanical relay?

A: There are many applications that require a moderate

amount of power (W to kW) to be switched on and off fairly

rapidly. A good example would be the operation of a heater

element in a controlled-temperature system. Typically, the

amount of heat put into the system is regulated using pulse-

width modulation turning a fixed-power heating element on

and off for time periods ranging from seconds to minutes.

Mechanical relays have a finite cycle life, as their components

tend to wear out over thousands to millions of cycles. SSRs do

not have this problem; in the proper application, they could

be operated almost infinitely.

Q : What are the limitations of using an SSR?

A: SSRs have a few limitations when compared to the

capabilities of their mechanical counterparts. First, because

the relay is semiconductor-based, it will never turn all the way

on, nor off. This means that in the “on” state, the relay still has

some internal resistance to the flow of electricity, causing it to

get hot. When in the “off” state, the relay will exhibit a small

amount of leakage current, typically a few mA. This leakage

can conspire to keep some loads, especially ones with a high

impedance, from turning off! Additionally, SSRs are more

sensitive to voltage transients; while Opto 22 relays are very

well transient-protected, if a relay gets hit hard enough a

sufficient number of times, it will die or degrade. This makes

SSRs less ideal for driving highly inductive electromechanical

loads, such as some solenoids or motors. SSRs should also

never be used for applications such as safety power

disconnects, because even in the off state, leakage current is

present. Leakage current through an SSR also implies the

presence of a potentially high voltage. Even though the relay

is not conducting a large amount of current, the switched

terminal will still be “hot,” and thus dangerous.

480 Volt Three-Phase Motors

SSR MODEL MOTOR

480D10-12 1-½ HP

480D15-12 1-½ HP

Opto 22

Relay

Motor Full

Load Rating

Resistor for

120V line

Resistor for

240V line

3-Amp 1.25-Amp 4 ohm 50 W 8 ohm 50 W

10-Amp 5-Amp 1 ohm 100 W 2 ohm 100 W

25-Amp 8-Amp .5 ohm 100 W 1 ohm 100 W

45- Am p 16-Amp .25 ohm 150 W .5 oh m 15 0 W

15-Amp 5-Amp 1 ohm 100 W 2 ohm 100 W

Solid-State Relays

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Solid-State Relays DATA SHEET

Form 0859-170111

PAGE

Q: Which SSRs should I use with a printed circuit

board (PCB)?

A: If you are mounting SSRs to a PCB, use the MP or P series

SSRs , which are designed for that purpose.

We do not recommend mounting the terminal side of a Power

Series or Z series SSR to a flat PCB (or to any other flat surface),

because there may be some variation in terminal height or

alignment from one terminal to another and from one SSR to

another.

Q : Do you make multi-pole or multi-throw SSRs?

A: Opto 22 manufactures only single-pole, single-throw SSRs.

If multi-phase operation is required, just use a relay on each

phase. Because of the limitations on semiconductor devices of

the type used in SSRs, it is not practical to build single-device

multi-throw SSRs. However, an alternative to multi-throw

operation may be accomplished with multiple relays.

Q : Can I hook up SSRs in parallel to achieve a higher

current rating?

A: No. There is no way to guarantee that two or more relays

will turn on simultaneously when operated in parallel. Each

relay requires a minimum voltage across the output terminals

to function; because of the optical isolation feature, the

“contact” part of the SSR is actually powered by the line it

switches. One relay turning on before the other will cause the

second relay to lose its turn-on voltage, and it won’t ever turn

on, or at least not until the first relay fails from carrying too

much current.

Q : What does a “zero-crossing” turn-on circuit refer

to?

A: An AC sine wave will be positive for the first half of each

cycle and negative for the second half of each cycle. The

voltage will cross through zero when the sine wave changes

from the positive half-cycle to the negative half-cycle, and vice

versa. So the voltage crosses through zero twice with each full

AC sine wave cycle. “Zero-crossing” turn-on means that the

SSR will only turn on when the AC sine wave passes through

zero voltage. The actual turn-on will occur at or near zero

voltage. All Opto 22 AC output solid-state relays are designed

with a zero-crossing turn-on circuit. Zero-voltage turn-on has

the benefit of minimizing electrical noise. All Opto 22 AC

output solid-state relays use a zero-current turn-off circuit as

well.

Q : Can I use an AC SSR to switch DC?

A: No. Because of the zero-crossing circuit described above,

the relay will most likely never turn on, and even if it is on, it

will most likely not be able to be turned off.

Q : Can I use a DC SSR to switch AC?

A: No. The semiconductor device used in Opto 22’s DC SSRs is

polarized. It may break down and conduct for the portion of

the waveform that is reversed in polarity.

Q : Can a DC SSR be used to switch an analog signal?

A: This is not recommended at all. First, the voltage drop across

the relay will cause signal loss. Second, the conduction

characteristics of the SSR are very non-linear at low operating

voltages and currents. Use a mechanical relay; it will work

much better.

Q : What agency approvals do your SSRs carry?

A: In general, Opto 22 relays carry UL, CSA, and CE approval.

See http://support.opto22.com. Additionally, some SSRs

contain VDE-approved optocouplers; contact Opto 22 for

more information.

FAQ: SSR Troubleshooting

Q : My SSR does not function anymore. What may

have happened?

A: There is no “normal” mode of failure for SSRs. They just stop

working, by refusing to turn on or off. An improper installation

is often to blame for an SSR failure, as these are very simple,

reliable devices. If you have a failed SSR, it is important to look

at the normal operating parameters of that relay within the

larger system to make sure that the relay being used is

appropriate to the application, and that the relay is being

properly installed in the system. The three most common

causes of SSR failure are as follows:

• SSR improperly matched to load. The relay was

destroyed by overheating from carrying too much

current too long.

• SSR insufficiently protected. Remember, a

semiconductor is less tough than a simple metal contact.

Reverse voltages exceeding the PRV rating of the relay

will cause damage. Voltage spikes on the switched line,

perhaps from inductive kickback, may have destroyed

one or more of the internal switching devices.

Remember to use snubbers, transorbs, MOVs, and/or

commutating diodes on highly inductive loads.

• SSR improperly installed. The SSR was not mounted to

a large enough heat sink, or no thermal compound was

used, causing the relay to overheat. Also, insufficient

tightening of the load terminals can cause arcing and

ohmic heating of the relay. Opto 22 recommends 18

inch-pounds of torque on the load screw terminals.

Similar failures have also been attributed to the use of

Solid-State Relays

Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com

SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com

Solid-State Relays

PAGE

DATA SHEET

Form 0859-170111

crimp-on terminal lugs or spades; make sure such

terminals are tightly crimped, and even drip some solder

into the joint to ensure good electrical contact and

protection from corrosion.

Q : How can I test my SSR?

A: It is not possible to test an SSR by the same methods used

to test mechanical relays; a typical SSR will always show an

infinite impedance to a resistance meter placed across the

output terminals. There are a few reasons for this. First, the SSR

requires a small amount of power to operate, derived from

whatever voltage source is placed on the load terminals. A

typical multimeter will not supply sufficient voltage to cause

the relay to change state. Second, AC SSRs contain zero-

voltage turn-on and zero-current turn-off circuits. The SSR will

not be able to turn on unless there is AC voltage connected to

the output terminals. Most test equipment will supply a DC

voltage to the relay, so it will never see the zero-voltage

transition it requires to turn on. To test an SSR, it is best to

operate it at the actual line voltage it will be used at, driving a

load such as a large light bulb.

Q : I have an SSR driving a load. The load turns on

okay, but never seems to turn off, unless I remove

power from the relay entirely. What might be hap-

pening?

A: This is normally a problem when using an SSR with a high-

impedance load, such as a neon lamp or a small solenoid.

Loads like these often have relatively large initial currents, but

relatively small “hold in” currents. The result is that the off-state

leakage current through the relay (see previous section) is

insufficient to cause the load to turn on to start with, but

sufficient to keep it on, once started. The solution is to place a

power resistor, sized for 8–10 times the rated maximum

leakage current for the SSR in parallel with the load. Make sure

that this resistor has a high enough power rating for the

application. For example, for a 5 mA leakage current at 120

VAC, a resistor drawing 50 mA would be desirable. Using

Ohm’s Law, the resistor value becomes 2,400 ohms. This

resistor will dissipate 6 watts, so a 7.5 or 10-watt size power

resistor should be used.

Q : I have a new AC SSR driving a solenoid. It turns on

okay once, but will not turn on again. What is going

on?

A: Some solenoids, some types of halogen lights, and some

types of strobe lights incorporate a diode in series with the coil

or filament. This causes the light to behave as a half-wave

rectifier. Opto 22 SSRs have a built-in R-C snubber circuit in

parallel with the output. The capacitor in this circuit charges

up but cannot discharge through the series diode, causing a

voltage to appear across the SSR terminals. Because the SSR

must detect the AC waveform cross through zero volts on the

load terminals, it will not be able to turn on again. The solution

here would be to put a high-value resistor (several tens of

Kohms) across the terminals of the relay, to allow the capacitor

to drain its charge.

More About Opto 22

www.opto22.com • Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • Form 1335-160810

SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com

© 2013–2016 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.

Products

Opto 22 develops and manufactures reliable, easy-to-use, open

standards-based hardware and software products deployed

worldwide.

Industrial automation, process control, building automation,

industrial refrigeration, remote monitoring, data acquisition,

Industrial Internet of Things (IIoT), and information technology

applications all rely on Opto 22.

groov

Monitor and control your

equipment from anywhere

using your smartphone or

tablet with groov. Build your

own mobile app easily—just

drag, drop, and tag. No

programming or coding. Visit

groov.com

for more

information and your free trial.

SNAP PAC System

Developer- and IIoT-ready, the SNAP PAC System connects

physical assets to databases and applications using open

standards. The SNAP PAC System consists of four integrated

components:

•SNAP PAC controllers

•PAC Project™ Software Suite

•SNAP PAC brains

•SNAP I/O™

SNAP PAC Controllers

SNAP PAC programmable

automation controllers handle a

wide range of digital, analog, and

serial functions for data collection,

remote monitoring, process control,

and discrete and hybrid manufacturing.

For IIoT applications and easier integration with company

systems, standalone and rack-mounted SNAP PACs include a

built-in HTTP/HTTPS server and

RESTful API

(application

program interface). The REST API gives you secure, direct access

to I/O and variable data using your choice of programming

languages. No middleware, protocol converters, drivers, or

gateways needed.

Based on open Ethernet and Internet Protocol (IP) standards,

SNAP PACs make it easier to build or extend a system without the

expense and limitations of proprietary networks and protocols.

PAC Project Software Suite

Opto 22’s PAC Project Software Suite offers full-featured, cost-

effective control programming, HMI (human machine interface),

OPC server, and database connectivity software.

Control programming includes both easy-to-learn flowcharts and

optional scripting. Commands are in plain English; variables and

I/O point names are fully descriptive.

PAC Project Basic offers control and HMI tools and is free for

download on our website,

www.opto22.com

. PAC Project

Professional, available for separate purchase, adds one SoftPAC

software-based controller, OptoOPCServer, OptoDataLink,

options for controller redundancy or segmented networking, and

support for legacy Opto 22 serial

mistic™

I/O units.

SNAP PAC Brains

While SNAP PAC controllers provide central control and data

distribution, SNAP PAC brains provide distributed intelligence for

I/O processing and communications. Brains offer analog, digital,

and serial functions, including thermocouple linearization, local

PID loop control, watchdog, totalizing, and much more.

SNAP I/O

I/O provides the local connection to sensors and equipment.

Opto 22 SNAP I/O offers 1 to 32 points of reliable I/O per module.

Analog, digital, and serial modules are mixed on one mounting

rack and controlled by a SNAP PAC brain or rack-mounted PAC.

Quality

Founded in 1974, Opto 22 has established a worldwide

reputation for high-quality products. All are made in the U.S.A. at

our manufacturing facility in Temecula, California.

Because we test each product twice before it leaves

our factory, rather than only testing a sample of each

batch, we can guarantee most solid-state relays and

optically isolated I/O modules for life.

Free Product Support

Opto 22’s California-based Product Support Group

offers free, comprehensive technical support for

Opto 22 products from engineers with decades of training and

experience. Support is available in English and Spanish by phone

or email, Monday–Friday, 7 a.m. to 5 p.m. PST.

Additional support is always available on our website: how-to

videos, OptoKnowledgeBase, self-training guide, troubleshooting

and user’s guides, and OptoForums.

In addition, hands-on training is available for free at our Temecula,

California headquarters, and you can

Purchasing Opto 22 Products

Opto 22 products are sold directly and through a worldwide

network of distributors, partners, and system integrators.

For more information, contact Opto 22 headquarters at

800-321-6786 (toll-free in the U.S. and Canada) or 951-695-3000,

or visit our website at