7020-01039-0 - Murata - Datasheet.Live

DMS Accessories

5 Amp AC Current Transformers

www.murata-ps.com Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000

MPM_DMS-CT.A01 Page 1 of 4

These commercial grade, UL & CSA recognized, “donut style” AC current-transformers

(CT) provide an isolated 0-5A output that can be used with DATEL’s ACA5 Series of digital

ammeters. Installation is straightforward: simply pass the load-carrying conductor through

the 5A CT’s primary window, and then route its secondary’s leads through the ACA5-amme-

ter’s built-in, low-burden, toroid sensor.

All models feature rugged, fully insulated construction, allowing continuous operation

with primary voltages up to 600Vac, at line frequencies from 50 to 400Hz. Fourteen models

are available to enable accurate measurements from 50A through 2000A. When combined

with DATEL’s ACA5 Series ammeters, secondary lead-extensions may be used for those

applications where the CT cannot be installed in the immediate vicinity of the ammeter.

TECHNICAL NOTES

~ Basic Lightning Impulse Insulation Level (BIL): The insulation

strength referenced to the crest value of an impulse voltage-

waveform which rises to a crest value in 1.2 microseconds, then

drops to ½ the crest value in 50 microseconds.

Insulation Class 600V, 10kV BIL full wave~

Frequency Range 50-400Hz

Supplied Secondary Flexible conductors, 24"

Leads (61cm) 16AWG (1.8mm2),

UL Style 1015, 105°C

Max. Secondary Lead See Table 1 and technical

Length note 5

Rated Accuracy See Table 1 and

technical note 6

Burden See Table 1

UL FIle No. E93779

CSA File No. LR89403

Weight 1.0 lbs. (454g)

IMPORTANT! To ensure safe and reliable operation, Current Transformers and asso-

ciated equipment must be installed and serviced by qualiﬁed technical personnel.

Never open the CT’s secondary connections while the primary is energized. Open

CT secondary wiring can generate potentially lethal voltages when the primary cir-

cuit is energized. Contact DATEL if you have any doubts regarding the installation

or operation of any of our ac-mains measurement instruments and accessories.

1. CT Precautions: In normal operation, a 5A current transformer’s secondary circuit

operates at a relatively low voltage due to its closed-loop, low burden conﬁguration

(essentially zero Ohms when used with DATEL’s ACA5 series ammeters). However, any

CT can generate potentially lethal voltages if its output current is suddenly interrupted. For

example, loose secondary connections can produce a condition referred to as “inductive

kick.” Inductive kick can generate extremely high voltages across the open secondary

connections.

Therefore, all connections made to a CT’s secondary leads must only be performed with

zero current ﬂowing in the primary circuit. Never operate a CT with its secondary circuit

open and current ﬂowing in the primary.

2. CT Connections and Grounding: Some applications require connecting one of the CT’s

5A output terminals to earth/chassis ground. In the USA, consult the latest revision of the

National Electrical Code for more information.

After all mechanical assembly is completed, pass the 5A secondary leads through the

ACA5 ammeter’s built-in toroid, then connect the two leads together as shown in Figure

1. For this connection, and for connections involving lead extensions, pressure-style

connectors (commonly called “wire nuts”) are acceptable as long as they are rated for the

currents and voltages involved.

3. Installation: CT’s must be installed in a manner that ensures no excessive stresses are

applied to the primary conductor that passes through the CT or to the secondary circuit

and its associated instruments. Use plastic tie-wraps and/or other suitable non-conductive

restraining devices to secure the CT.

Figure 1. Typical Connections

TB1

ACA5-20PC-X-ACX

AC POWER

SUPPLY

5A CURRENT

TRANSFORMER

TO AC LOAD

0-5A

OUTPUT

(see technical notes)

General Speciﬁcations (all models)

DMS Accessories

5 Amp AC Current Transformers

Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000

www.murata-ps.com

MPM_DMS-CT.A01 Page 2 of 4

TECHNICAL NOTES

Table 1. Selection Guide

DATEL Part No. Current Ratio Accuracy Burden Lead Ext. Thermal Rating Factor

(Amps) (@ 60Hz) VA (Ohms) Feet (Meters) (@30°C)

7020-01036-0 50:5 ±2% 1.5 (0.06) 4 (1.2) 1.5

7020-01037-0 75:5 ±2% 3.0 (0.12) 10 (3.0) 1.5

7020-01038-0 100:5 ±1% 3.0 (0.12) 10 (3.0) 1.5

7020-01039-0 150:5 ±1% 6.0 (0.24) 20 (6.1) 1.5

7020-01040-0 200:5 ±1% 8.0 (0.32) 30 (9.1) 1.5

7020-01041-0 250:5 ±1% 10.0 (0.40) 40 (12.2) 1.5

39-3681407* 300:5 ±1% 12.5 (0.50) 50 (15.2) 1.5

39-3681408* 400:5 ±1% 12.5 (0.50) 50 (15.2) 1.5

39-3681409* 500:5 ±1% 20.0 (0.80) 80 (24.4) 1.5

7020-01042-0 600:5 ±1% 10.0 (0.40) 40 (12.2) 2.0

7020-01043-0 750:5 ±1% 10.0 (0.40) 40 (12.2) 2.0

7020-01044-0 1000:5 ±1% 10.0 (0.40) 40 (12.2) 2.0

7020-01045-0 1500:5 ±1% 12.5 (0.50) 50 (15.2) 2.0

7020-01046-0 2000:5 ±1% 15.0 (0.60) 60 (18.3) 2.0

* Not RoHS Compliant

burden column. Accuracy measurements are taken at 100% primary

current, using a resistive burden and a nominal line frequency of 60Hz.

7. Polarity: CTs are marked with ‘H1’ (primary) and ‘X1’ (secondary)

polarity indicators. When a CT’s only function is to measure amperes,

polarity markings can be disregarded. However, correct polarity is

mandatory in applications in which the phase relationship between

two currents is involved (watt or watt-hour meters are two examples

of polarity sensitive applications). Refer to the respective instruments’

documentation for more information.

8. Thermal Rating Factor: The thermal rating factor denotes the amount

by which the primary current can be increased on a continuous

basis over its rated value without exceeding the CT’s maximum

temperature rise.

The formula below can be used to calculate thermal rating factors at

temperatures above 30°C.

4. Reference Documentation: Prior to connecting CTs to any measure-

ment device (analog or digital), relay, or other apparatus, be sure to

thoroughly review the applicable device’s technical documentation (for

example, DATEL’s ACA5-20PC product data sheet). In particular, make

sure the CT’s ratings meet the requirements of your application.

5. Secondary Lead Extensions: When calculating the total burden

imposed on a CT’s 5A output, DATEL’s ACA5 digital ammeters’ input

impedance is negligible and can be assumed to be zero Ohms. In

many applications, the length of secondary wiring can be increased up

to the value speciﬁed in Table 1 without adversely affecting perfor-

mance.

In order to achieve the speciﬁed accuracy, the maximum permissible

burden must not exceed the value shown in Table 1. When used with

ACA5 ammeters, the total burden is the sum of the resistance of the

CT’s 24” leads and any lead-extensions. Make sure all connections

are securely tightened and properly strain relieved. If terminal blocks

are used for intermediary connections, refer to the manufacturer’s

torque recommendations.

Table 1 lists general guidelines for adding lead extensions when using

DATEL’s ACA5-Series ammeters as the readout device. The lengths in

Table 1 assume the lead extensions are 16AWG. Stated dimensions

are one-way distances between the ACA5 and the CT. Make sure all

secondary extensions meet or exceed the speciﬁcations of the CT’s

built-in leads. In order to minimize external noise pick up, lead exten-

sions should be as kept short as possible.

6. Accuracy: The indicated accuracy speciﬁcations are valid as long

as the total secondary burden does not exceed the value in Table 1’s

(85 - NAT)(RF)

NAT

NRF =

(85 - 55)(2)

NRF = = 1.48

NRF = Rating Factor at New Ambient Temperature

RF = 30°C Rating Factor

NAT = New Ambient Temperature

Example: Find the 55°C. thermal rating factor of a 2000:5 CT whose

30°C rating factor is 2.0

DMS Accessories

5 Amp AC Current Transformers

Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000

www.murata-ps.com

MPM_DMS-CT.A01 Page 3 of 4

MECHANICAL SPECIFICATIONS

Models: 7020-01036-0 – (50:5)

7020-01037-0 – (75:5)

7020-01038-0 – (100:5)

7020-01039-0 – (150:5)

7020-01040-0 – (200:5)

7020-01041-0 – (250:5)

Models: 39-3681407 – (300:5)

39-3681408 – (400:5)

39-3681409 – (500:5)

Models: 7020-01042-0 – (600:5)

7020-01043-0 – (750:5)

7020-01044-0 – (1000:5)

7020-01045-0 – (1500:5)

7020-01046-0 – (2000:5)

1.56

(39.6)

DIA

1.10 (27.9)

3.56

(90.4)

1.25

(31.8)

DIA

1.42 (36.1)

2.69

(68.3)

3.00

(76.2)

DIA

1.13 (28.7)

4.50

(114.3)

DMS Accessories

5 Amp AC Current Transformers

Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other

technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply

the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Speciﬁcations are subject to change without

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Website: www.murata-ps.jp

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Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com

Murata Power Solutions, Inc.

11 Cabot Boulevard, Mansﬁeld, MA 02048-1151 U.S.A.

Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356

www.murata-ps.com email: sales@murata-ps.com ISO 9001 REGISTERED

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MPM_DMS-CT.A01 Page 4 of 4