HMI ComponentsEdition 01/2016
Characteristics
The robust Series 02 is especially
suited for:
■ Flush design
The rectangular construction (24 x 36 mm)
provides large surfaces for illumination
and labelling.
Functions
The Series 02 incorporates the
following functions:
■ Indicator
■ Pushbutton
■ Illuminated pushbutton
■ Keylock switch
■ Buzzer
Market segments
The EAO Series 02 is especially suited
for applications in the segments:
■ Ship building
■ Panel building
Series 02
Please refer to the EAO website to obtain detailed information regarding this series www.products.eao.com
Confi gure a product to your exact needs and request a quotation.
3
Content
Overview
Flush design
Indicator 4
Buzzer 5
Pushbutton 6
Illuminated pushbutton 7
Mushroom-head pushbutton 8
Keylock switch 9
Mushroom-head keylock pushbutton 10
Accessories 11
Technical data 21
Marking 23
Application guidelines 24
Index 25
02
4
Flush design
37.6 x 23.5
84
7
10 max.
NJO
NJO
3 NBY
1
2
Wiring diagram 1
Indicator, IP 40
Product can differ from the current configuration. Dimensions [mm]
Mounting cut-outs [mm]
Additional Information
• For front dimension 24 x 36 mm
• For indicator 02-07x.00x can only filament lamps
be used (no LEDs)
• For LED element fitting information see chapter
«Application guidelines»
• Take note of heat generating
Equipment consisting of (schematic overview)
Front bezel page 13
Lens page 11
LED page 17
Actuator
Fixing bezel
Each article number listed below includes all the black
components shown in the 3D-drawing.
To obtain a complete unit, please select the red com-
ponents from the pages shown.
Product attribute Behind panel depth Terminal Part No.
Wiring
diagram
Weight
Indicator actuator
without serie resistor, for LED or filament lamp 60 mm Screw 02-021.001 1 0.030 kg
Indicator actuator
with built-in lamp series resistor, 240 VAC/DC to 48 V, 25 mA,
for filament lamp
84 mm Screw 02-070.001 1 0.045 kg
with built-in lamp series resistor, 110 VAC/DC to 48 V, 25 mA,
for filament lamp
84 mm Screw 02-071.001 1 0.045 kg
with built-in lamp series resistor, 125 VAC/DC to 48 V, 25 mA,
for filament lamp
84 mm Screw 02-072.001 1 0.045 kg
with built-in lamp series resistor and diode, 240 VAC/DC to 48 V, 25 mA,
for filament lamp
84 mm Screw 02-073.001 1 0.045 kg
02
5
Flush design
84
75
7
10 max.
37.6 x 23.5
NJO
NJO
3 NBY
c
d
U1=30-55 VAC
35-75 VDC
U
2=10-35 VAC
1
0-50 VDC
e
f
g
h
f
g
h
Continous
tone
c
d
e
Intermittent tone
approx. 3Hz
Volume control
Wiring diagram 1
Buzzer, IP 40
Product can differ from the current configuration. Dimensions [mm]
Mounting cut-outs [mm]
Additional Information
• For front dimension 24 x 36 mm
• Further information in chapter «Technical Data»
Equipment consisting of (schematic overview)
Front bezel page 13
Buzzer
Fixing bezel
Each article number listed below includes all the black
components shown in the 3D-drawing.
To obtain a complete unit, please select the red com-
ponents from the pages shown.
Operating voltage Front cap Terminal Part No.
Wiring
diagram
Weight
Buzzer
10 ... 55 VAC, 10 ... 75 VDC Pastic black Screw 02-810.001 1 0.060 kg
02
6
Flush design
84
75
7
10 max.
37.6 x 23.5
NJO
NJO
3 NBY
ed
c
fg
h
ed
c
fg
h
d e
c
fg
h
e d
c
fg
h
Wiring diagram 1 Wiring diagram 2 Wiring diagram 3 Wiring diagram 4 Wiring diagram 5
Pushbutton, IP 40
Product can differ from the current configuration. Dimensions [mm]
Mounting cut-outs [mm]
Additional Information
• For front dimension 24 x 36 mm
Equipment consisting of (schematic overview)
Front bezel page 13
Lens page 11
Actuator
Fixing bezel
Each article number listed below includes all the black
components shown in the 3D-drawing.
To obtain a complete unit, please select the red com-
ponents from the pages shown.
Contacts Switching action Terminal Part No.
Wiring
diagram
Weight
1 C A Screw 02-611.011 1 0.045 kg
C Screw 02-613.011 2 0.045 kg
2 C A Screw 02-612.011 3 0.050 kg
C Screw 02-614.011 4 0.050 kg
B - C Screw 02-615.011 5 0.050 kg
Contacts: C = Changeover
Switching action: B = Momentary, C = Maintain
02
7
Flush design
84
75
7
10 max.
37.6 x 23.5
NJO
NJO
3 NBY
1ed
c2
1fg
h2
1ed
c
fg
h2
1d e
c
fg
h2
Wiring diagram 1 Wiring diagram 2 Wiring diagram 3 Wiring diagram 4
ed
c
fg
h
1
2
Wiring diagram 5
Illuminated pushbutton, IP 40
Product can differ from the current configuration. Dimensions [mm] [mm]
Mounting cut-outs [mm]
Additional Information
• For front dimension 24 x 36 mm
• For LED element fitting information see chapter
«Application guidelines»
Equipment consisting of (schematic overview)
Front bezel page 13
Lens page 11
LED page 17
Actuator
Fixing bezel
Each article number listed below includes all the black
components shown in the 3D-drawing.
To obtain a complete unit, please select the red com-
ponents from the pages shown.
Contacts Switching action Terminal Part No.
Wiring
diagram
Gewicht
Illuminated pushbutton actuator
1 C B Screw 02-616.011 1 0.050 kg
C Screw 02-618.011 2 0.050 kg
2 C B Screw 02-617.011 3 0.055 kg
C Screw 02-619.011 4 0.055 kg
B - C Screw 02-620.011 5 0.055 kg
Contacts: C = Changeover
Switching action: B = Momentary, C = Maintain
02
8
Flush design
84
75
16
10 max.
37.6 x 23.5
NJO
NJO
3 NBY
ed
c
fg
h
ed
c
fg
h
d e
c
fg
h
e d
c
fg
h
Wiring diagram 1 Wiring diagram 2 Wiring diagram 3 Wiring diagram 4 Wiring diagram 5
Mushroom-head pushbutton, IP 40
Product can differ from the current configuration. Dimensions [mm]
Mounting cut-outs[mm]
Additional Information
• For front dimension 24 x 36 mm
• Use only flush front bezel
Equipment consisting of (schematic overview)
Mushroom-head
cap page 11
Front bezel page 13
Actuator
Fixing sleeve
Each Part Number listed below includes all the black
components shown in the 3D-drawing.
To obtain a complete unit, please select the red com-
ponents from the pages shown.
Contacts Switching action Terminal Part No.
Wiring
diagram
Weight
Mushroom-head pushbutton actuator
1 C B Screw 02-611.011 1 0.045 kg
C Screw 02-613.011 2 0.045 kg
2 C B Screw 02-612.011 3 0.050 kg
C Screw 02-614.011 4 0.050 kg
B - C Screw 02-615.011 5 0.050 kg
Contacts: C = Changeover
Switching action: B = Momentary, C = Maintain
02
9
Flush design
75
1026
37.6 x 23.5
10 max.
NJO
NJO
3 NBY
ed
c
fg
h
Wiring diagram 1
B
A
Keylock switch 2 positions, IP 40
Product can differ from the current configuration. Dimensions [mm]
Mounting cut-outs [mm]
Additional Information
• For front dimension 24 x 36 mm
• Front plastic grey
• Keylock number YB1
• After turning the key 90° clockwise, the switch
can be operated
• In the unlocked switch positions always perform a
momentary action
• Two keys are supplied with each key lock switch
Equipment consisting of (schematic overview)
Front bezel page 13
Keylock front
bezel page 12
Actuator
Fixing bezel
Each article number listed below includes all the black
components shown in the 3D-drawing.
To obtain a complete unit, please select the red com-
ponents from the pages shown.
Switching positions (A = Rest, B = Momentary)
Product attribute Contacts Switching angle Key remove Terminal Part No.
Wiring
diagram
Gewicht
Schlüsselschalter-Vorsatz 2 Stellungen
A = lockable, actuated 2 C B = 90° A Screw 02-690.011 1 0.055 kg
A = lockable, non-actuated or actuated 2 C B = 90° A Screw 02-692.011 1 0.055 kg
A = lockable, non-actuated 2 C B = 90° A Screw 02-691.011 1 0.055 kg
Contacts: C = Changeover
02
10
Flush design
75
1026
37.6 x 23.5
10 max.
NJO
NJO
3 NBY
ed
c
fg
h
Wiring diagram 1
B
A
Keylock switch 2 positions, IP 40
Product can differ from the current configuration. Dimensions [mm]
Mounting cut-outs [mm]
Additional Information
• For front dimension 24 x 36 mm
• Front plastic grey
• Keylock number YB1
• After turning the key 90° clockwise, the switch
can be operated
• In the unlocked switch positions always perform a
momentary action
• Two keys are supplied with each key lock switch
Equipment consisting of (schematic overview)
Front bezel page 13
Keylock front
bezel
Actuator
Fixing bezel
Each article number listed below includes all the black
components shown in the 3D-drawing.
To obtain a complete unit, please select the red com-
ponents from the pages shown.
Switching positions (A = Rest, B = Momentary)
Product attribute Contacts Switching angle Key remove Terminal Part No.
Wiring
diagram
Gewicht
Schlüsselschalter-Vorsatz 2 Stellungen
A = lockable, non-actuated, B = lockable,
key not removable
2 C B = 90° A Screw 02-695.011 1 0.055 kg
A = lockable, non-actuated or actuated; can be used
with protective cover Part No. 22-925
2 C B = 90° A Screw 02-198.011 1 0.055 kg
Contacts: C = Changeover
02
11
Accessories
Front
Lens
Additional Information
• Material plastic
Product attribute Dimension Lens Part No. Weight
Lens
illuminative, not suitable for film insert, ripped 17.5 x 25.4 mm smoked translucent 02-901.1 0.004 kg
red translucent 02-901.2 0.004 kg
orange translucent 02-901.3 0.004 kg
yellow translucent 02-901.4 0.004 kg
green translucent 02-901.5 0.004 kg
blue translucent 02-901.6 0.004 kg
colourless transparent 02-901.7 0.004 kg
white translucent 02-901.9 0.004 kg
illuminative, use holder for film insert 17.5 x 25.4 mm red translucent 02-902.2 0.004 kg
green translucent 02-902.5 0.004 kg
colourless transparent 02-902.7 0.004 kg
non-illuminative 17.5 x 25.4 mm black opaque 02-901.0 0.004 kg
grey opaque 02-901.8 0.004 kg
Keylock front bezel
Additional Information
• Keylock number YB1
• Further lock numbers see «Technical data»
Product attribute Dimension Material Colour Part No. Weight
Keylock front bezel
17.5 x 25.5 mm Plastic grey 02-980.1 0.002 kg
for keylock switch Part No. 02-695 17.5 x 25.5 mm Plastic grey 02-982.1 0.002 kg
02
12
Accessories
Holder
Additional Information
• For lens with film insert
Material Colour Optics Part No. Weight
Holder
Plastic red translucent 02-908.2 0.001 kg
orange translucent 02-908.3 0.001 kg
yellow translucent 02-908.4 0.001 kg
green translucent 02-908.5 0.001 kg
blue translucent 02-908.6 0.001 kg
colourless transparent 02-908.7 0.001 kg
white translucent 02-908.9 0.001 kg
Diffusor plate
Additional Information
• For lens with film insert
Part No. Weight
Diffusor plate
02-909 0.001 kg
Front bezel flush
Additional Information
• Lens only removable with lens remover
Part No. 02-905
Front bezel Part No. Weight
Front bezel flush, Front dimension 24 x 36 mm
Pastic black 02-965.0 0.001 kg
02
13
Accessories
10.5
2
13.7
36
29.7
18 36.5
30
Front bezel raised
Additional Information
• Lens only removable with lens remover
Part No. 98-969
Front bezel Part No. Weight
Front bezel raised, Front dimension 24 x 36 mm
Pastic black 02-967.0 0.001 kg
Protective cover, IP 65
Additional Information
• Please note that bigger minimum distances are
necessary
• Use only flush front bezel
• Hinged, with means for sealing
• Front panel thickness reduces by 2 mm
Dimensions [mm]
Product attribute Material Optics Dimension Part No. Weight
Protective cover
for button with mounting cut-out 21.2 x 29.2 mm Plastic transparent 36 x 29.7 mm 22-925 0.004 kg
02
14
Accessories
30
42 9.5
NJO
NJO
3 NBY
Spare key
Additional Information
• Keylock number YB1
Part No. Weight
Spare key
02-989.001 0.001 kg
Front protective cap, IP 65
Additional Information
• Use only flush front bezel
• Three-part
Dimensions [mm] Mounting cut-outs [mm]
Material Colour Optics Temperature Part No. Weight
Front protective cap
PVC colourless transparent -20 ... +60 ° 02-924 0.005 kg
-25 ... +85 ° 02-935 0.005 kg
02
15
Accessories
NJO
NJO
3 NBY
Blind plug
Mounting cut-outs [mm]
Dimension Material Colour Part No. Weight
Blind plug
24 x 36 mm Plastic black 02-949.0 0.004 kg
grey 02-949.8 0.004 kg
02
16
Accessories
Backside
Terminal cover
Additional Information
• For all connection methods
• Not suitable for indicators with built-in series re-
sistor with lamp
Part No. Weight
Terminal cover
02-929 0.005 kg
02
17
Accessories
45 max.
Ø7.1 max.
+
Illumination
Single-LED, T6.8
Additional Information
• For LED element fitting information see «Applica-
tion guidelines»
• Due to high surface temperatures, the series
resistor must not be soldered directly to the termi-
nals of the equipment (use a terminal plate)
• When using AC/DC types with AC operation,
slight flickering can occure
• Luminous intensity data of the LEDs on direct
voltage
• Electrical and optical data are measured at 25 °C
• The specified versions are built with a protection
diode (halve wave rectifier) in series and the LED
• Luminosity and wave length variations caused by
LED manufacturing processes may cause slight
differences regarding the illumination
• For supply voltages above 48 V, it is necessary to
use a voltage reduction element (external series
resistor or transformer)
Dimensions [mm]
LED colour Operating voltage Operation current Lumi. intensity Dom. wavelength Part No. Weight
Single-LED
red 6 VDC 17 mA ±15 % 400 mcd 630 nm 10-2K06.3152 0.002 kg
12 VAC/DC 9/17 mA ±15 % 400 mcd 630 nm 10-2K09.1072 0.002 kg
24 VAC/DC 9/17 mA ±15 % 400 mcd 630 nm 10-2K12.1072 0.002 kg
28 VAC/DC 9/17 mA ±15 % 400 mcd 630 nm 10-2K13.1072 0.002 kg
48 VAC/DC 4/8 mA ±15 % 200 mcd 630 nm 10-2K19.1052 0.002 kg
yellow 6 VDC 17 mA ±15 % 340 mcd 340 nm 10-2K06.3154 0.002 kg
12 VAC/DC 9/17 mA ±15 % 340 mcd 340 nm 10-2K09.1074 0.002 kg
24 VAC/DC 9/17 mA ±15 % 340 mcd 340 nm 10-2K12.1074 0.002 kg
28 VAC/DC 9/17 mA ±15 % 340 mcd 340 nm 10-2K13.1074 0.002 kg
48 VAC/DC 4/8 mA ±15 % 180 mcd 340 nm 10-2K19.1054 0.002 kg
green 6 VDC 7 mA ±15 % 1050 mcd 525 nm 10-2K06.3155 0.002 kg
12 VAC/DC 4/7 mA ±15 % 1050 mcd 525 nm 10-2K09.1075 0.002 kg
24 VAC/DC 4/7 mA ±15 % 1050 mcd 525 nm 10-2K12.1075 0.002 kg
28 VAC/DC 4/7 mA ±15 % 1050 mcd 525 nm 10-2K13.1075 0.002 kg
48 VAC/DC 2/4 mA ±15 % 600 mcd 525 nm 10-2K19.1055 0.002 kg
blue 6 VDC 17 mA ±15 % 780 mcd 470 nm 10-2K06.3156 0.002 kg
12 VAC/DC 9/17 mA ±15 % 780 mcd 470 nm 10-2K09.1076 0.002 kg
24 VAC/DC 9/17 mA ±15 % 780 mcd 470 nm 10-2K12.1076 0.002 kg
28 VAC/DC 9/17 mA ±15 % 780 mcd 470 nm 10-2K13.1076 0.002 kg
48 VAC/DC 4/8 mA ±15 % 400 mcd 470 nm 10-2K19.1056 0.002 kg
02
18
Accessories
LED colour Operating voltage Operation current Lumi. intensity Dom. wavelength Part No. Weight
white 6 VDC 6 mA ±15 % 900 mcd x0.31/y0.32 nm 10-2K06.3159 0.002 kg
12 VAC/DC 3/6 mA ±15 % 900 mcd x0.31/y0.32 nm 10-2K09.1079 0.002 kg
24 VAC/DC 3/6 mA ±15 % 900 mcd x0.31/y0.32 nm 10-2K12.1079 0.002 kg
28 VAC/DC 2.5/5 mA ±15 % 750 mcd x0.31/y0.32 nm 10-2K13.1079 0.002 kg
48 VAC/DC 2/4 mA ±15 % 600 mcd x0.31/y0.32 nm 10-2K19.1059 0.002 kg
Filament lamp, T6.8
Operating voltage Operation current Part No. Weight
Filament lamp
12 VAC/DC 50 mA ±10 % 10-1209.1279 0.001 kg
12 VAC/DC 100 mA ±10 % 10-1209.1329 0.001 kg
24 VAC/DC 25 mA ±10 % 10-1212.1199 0.001 kg
24 VAC/DC 50 mA ±10 % 10-1212.1279 0.001 kg
28 VAC/DC 40 mA ±10 % 10-1213.1249 0.001 kg
30 VAC/DC 40 mA ±10 % 10-1214.1249 0.001 kg
36 VAC/DC 35 mA ±10 % 10-1216.1229 0.001 kg
Series resistor
Additional Information
• For filament lamp 48 VAC, 25 mA
• For lamp voltage reduction
• Keep to the country specific safety instructions
• Due to high surface temperatures, the series
resistor must not be soldered directly to the termi-
nals of the equipment (use a terminal plate)
Operating voltage Resistance Part No. Weight
Series resistor
110 VAC 2.7 kOhm 02-904.0 0.003 kg
125 VAC 3.3 kOhm 02-904.1 0.003 kg
145 VAC 4.7 kOhm 02-904.3 0.003 kg
240 VAC 10 kOhm 02-904.7 0.003 kg
02
19
Accessories
Terminal plate empty
Additional Information
• For fitting with series resistors
Product attribute Dimension Part No. Weight
Terminal plate empty
5 spaces 62.5 x 60 x 15 mm 02-912.1 0.025 kg
10 spaces 125 x 60 x 15 mm 02-912.2 0.045 kg
15 spaces 187.6 x 60 x 15 mm 02-912.3 0.090 kg
20 spaces 250 x 60 x 15 mm 02-912.4 0.095 kg
02
20
Accessories
Mounting
Lens remover
Product attribute Part No. Weight
Lens remover
for flush front bezel 02-905 0.011 kg
Lens remover
for raised front bezel 98-968 0.004 kg
Lamp remover
Additional Information
pVorsicht: A switching process might be released
when replacing the lamp
Product attribute Part No. Weight
Lamp remover
for LED 03-996 0.027 kg
Lamp remover
for filament lamp 61-9740.0 0.003 kg
02
21
Technical data
Actuator with snap-action switching element
Switching system
1 or 2 self-cleaning, snap-action switching elements.
1 or 2 double-throw contacts.
Material
Material of contact
Standard version:
Silver (U > 20
V)
Special versions: (on request)
Gold/Silver 700
Au/300 Ag (U < 50 V)
Silver/Palladium 700
Ag/300 Pd (U > 20 V) for atmospheres
containing sulphur
Switch housing
Thermosetting material, heat-resistant
Indicator housing with reduced length
Polyamide
Mechanical characteristics
Terminals
Screw terminal (with self-lifting clip):
max. wire cross-section, 2 x 2.5
mm²
max. wire cross-section of stranded cable, 2 x 1.5
mm²
Tightening torque
For fixing sleeve max. 20
Ncm
For screw terminal max. 80
Ncm
Actuating force
6
N … 12 N
Actuating travel
5
mm
Mechanical lifetime
Momentary action 2 million operations
Maintained action 1 million operations
Electrical characteristics
Standards
The switches comply with the “Standards for low-voltage
switching devices” IEC 60947-5-1
Rated insulation voltage
400
VAC/440 VDC, as per IEC 60947-5-1
Conventional free air thermal current
10 A
The maximum current in continuous operation and at ambient
temperature not exceeding the quoted maximum values.
Switch rating
400 VAC, 10 A, cosφ 0.95, as per IEC 60947-5-1
250 VAC, 10 A, as per UL
Electric strength
2500 VAC, 50 Hz, 1 min. between all terminals and earth,
as per IEC 60947-5-1
Environmental conditions
Storage temperature
-30 °C … +85 °C
Service temperature
-25 °C … +55 °C
For indicators and illuminated pushbuttons mounted as a block,
make sure the heat can escape freely.
Protection degree
Front side IP 40, IP 65 with spray cover, as per IEC 60529
Shock resistance
15 g for 11 ms, as per IEC 60068-2-27
Vibration resistance
10 g at 10 … 2000 Hz, amplitude 1.0 mm, as per IEC 60068-2-6
Approvals
Approbations
CB (IEC 60947-5-1)
CSA
Germanischer Lloyd
UL
Declaration of conformity
CE
02
22
Technical data
Buzzer
Buzzer system
System
Electronic non-contacting buzzer with IC oscillator
Material
Buzzer case
Thermosetting material
Front cap
Polycarbonate (PC)
Front bezel
Polymethylacrylate
Mechanical characteristics
Terminals
Screw terminal
Tightening torque
For fixing sleeve max. 20
Ncm
For screw terminal max. 80
Ncm
Electrical characteristics
Frequency (tone)
Approx. 2.8 kHz
Sound pressure
85
dB (A) ±8 dB at a distance of 0.1 m
Volume variable with a
MΩ potentiometer or corresponding fixed
resistor
Operation Voltage/Current
typical
10 … 55 VAC 10 … 75 VDC
25 mA 15 mA
Environmental conditions
Storage temperature
-40 °C … +85 °C
Operating temperature
-25 °C … +55 °C
Protection degree
Front side IP 40, as per IEC 60529
Approvals
Approbations
CB (IEC 60947-5-1)
Declaration of conformity
CE
EAO reserves the right to alter specifications without further
notice.
02
23
Marking
General notes
1. Engraving
In addition to the most commonly used world languages, in
DIN1451-3 close spacing, other typefaces are available as
Scandinavian, Slavic, Greek, Russian and Polish. Red, blue and
black lenses are filled with white colour. Other colour lenses
arefilled in black. Standard height of letters is 3 mm. If the height
is not specified, we will supply 3 mm engraved letters.
2. Hot stamping
For larger series it is worth considering markings by means of hot
stamping. We will pleased to advise you. For letters and figures,
typefaces with 2.5 mm, 3 mm and 4 mm are available.
3. Film inserts
Instead of using engraving the lenses can be fitted with transpa-
rent film inserts, as an alternative. For this purpose, though, it
isadvisible to use lenses without ripped pattern. In the case of
use of a smoke-black lens the fitted film becomes readable only
ifthe lamp is on. The film (F) is inserted in the cap. To ensure
evenillumination a diffusor (D) is recommended, which is inserted
beneath the film. If, on the other hand, the diffusor is inserted
above the film, the lettering only becomes legible when the lamp
is alight. To hold the film and diffusor in position, the use of a
holder (N) is advised. The film thickness is 0.2 mm.
All dimensions in mm
Film insert max. size Height of letters h Number of lines
Number of
capital letters per line
(target value)
Number of
small letters per line
(target value) Image
14.3 x 22.4 3 4 11 13 B1
7 – 8 8 – 9 B2
42 7 9 B1
4 5 5 – 6 B2
52 5 – 6 6 – 7 B1
3 3 – 4 4 B2
61 5 6 B1
2 3 4 B2
813 4 B1
2 2 B2
h
F
D
N
ABC
abc
ABC
abc
B1 B2
02
24
Application guidelines
Suppressor circuits
LED polarity
The free-wheeling diode should be chosen so that the reverse
breakdown voltage is greater than the voltage driving the induc-
tive load. The DC blocking voltage (VR) of the free-wheeling diode
can be found in the datasheet of a diode. The forward current
should be equal or greater than the maximum current flowing
through the load.
To get an efficient protection, the free-wheeling diode must
be connected as close as possible to the inductive load!
When switching inductive loads such as relays, DC motors, and
DC solenoids, it is always important to absorb surges (e.
g. with a
diode) to protect the contacts. When these inductive loads are
switched off, a counter emf can severely damage switch contacts
and greatly shorten lifetime.
Fig. 1 shows an inductive load with a free-wheeling diode con
-
nected in parallel. This free-wheeling diode provides a path for the
inductor current to flow when the current is interrupted by the
switch. Without this free-wheeling diode, the voltage across the
coil will be limited only by dielectric breakdown voltages of the
circuit or parasitic elements of the coil. This voltage can be kilo
-
volts in amplitude even when nominal circuit voltages are low
(e.
g. 12 VDC) see Fig. 2.
When fitting the LED element the polarity has to correspond with
the respective terminal, (+) goes to +.
Several hundred
to several
thousend volts
ON OFF
0
e = L di
dt
__
V
DC
Switch
Free-wheeling
diode
Inductive
load
Counter EMF
over load without free-wheeling diode
Fig. 2
Switching with inductive load
Fig. 1
+
_
+
21
(+)
02
25
Index
02-021.001 ................ 4
02-070.001 ................ 4
02-071.001 ................ 4
02-072.001 ................ 4
02-073.001 ................ 4
02-198.011 .............. 10
02-611.011 ................ 6
02-611.011 ................ 8
02-612.011 ................ 6
02-612.011 ................ 8
02-613.011 ................ 6
02-613.011 ................ 8
02-614.011 ................ 6
02-614.011 ................ 8
02-615.011 ................ 6
02-615.011 ................ 8
02-616.011 ................ 7
02-617.011 ................ 7
02-618.011 ................ 7
02-619.011 ................ 7
02-620.011 ................ 7
02-690.011 ................ 9
02-691.011 ................ 9
02-692.011 ................ 9
02-695.011 .............. 10
02-810.001 ................ 5
02-901.0 .................. 11
02-901.1 .................. 11
02-901.2 .................. 11
02-901.3 .................. 11
02-901.4 .................. 11
02-901.5 .................. 11
02-901.6 .................. 11
02-901.7 .................. 11
02-901.8 .................. 11
02-901.9 .................. 11
02-902.2 .................. 11
02-902.5 .................. 11
02-902.7 .................. 11
02-904.0 .................. 18
02-904.1 .................. 18
02-904.3 .................. 18
02-904.7 .................. 18
02-905 ..................... 20
02-908.2 .................. 12
02-908.3 .................. 12
02-908.4 .................. 12
02-908.5 .................. 12
02-908.6 .................. 12
02-908.7 .................. 12
02-908.9 .................. 12
02-909 ..................... 12
02-912.1 .................. 19
02-912.2 .................. 19
02-912.3 .................. 19
02-912.4 .................. 19
02-924 ..................... 14
02-929 ..................... 16
02-935 ..................... 14
02-949.0 .................. 15
02-949.8 .................. 15
02-965.0 .................. 13
02-967.0 .................. 13
02-980.1 .................. 12
02-989.001 .............. 14
03-996 ..................... 20
10-1209.1279 .......... 18
10-1209.1329 .......... 18
10-1212.1199 .......... 18
10-1212.1279 .......... 18
10-1213.1249 .......... 18
10-1214.1249 .......... 18
10-1216.1229 .......... 18
10-2K06.3152 .......... 17
10-2K06.3154 .......... 17
10-2K06.3155 .......... 17
10-2K06.3156 .......... 17
10-2K06.3159 .......... 18
10-2K09.1072 .......... 17
10-2K09.1074 .......... 17
10-2K09.1075 .......... 17
10-2K09.1076 .......... 17
10-2K09.1079 .......... 18
10-2K12.1072 .......... 17
10-2K12.1074 .......... 17
10-2K12.1075 .......... 17
10-2K12.1076 .......... 17
10-2K12.1079 .......... 18
10-2K13.1072 .......... 17
10-2K13.1074 .......... 17
10-2K13.1075 .......... 17
10-2K13.1076 .......... 17
10-2K13.1079 .......... 18
10-2K19.1052 .......... 17
10-2K19.1054 .......... 17
10-2K19.1055 .......... 17
10-2K19.1056 .......... 17
10-2K19.1059 .......... 18
22-925 ..................... 13
61-9740.0 ................ 20
98-968 ..................... 20
Part No. Page Part No. Page
02
Index from Part No.
