Low-Voltage Current Transformers / Extended Range Current Transformers (ERCTs) for Billing

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Low-Voltage Current Transformers / Extended Range Current Transformers (ERCTs) for Billing - CIC

CIC | CHALLENGE INDUSTRIAL CO., LTD., since 1974, is a global supplier of Low-Voltage Current Transformers / Extended Range Current Transformers (ERCTs) for Billing. CIC specializes in the manufacture of instrument transformers, distribution transformers, detuned reactors, epoxy insulators, electronic energy meters, etc. Also provided or distributed are a wide range of other electrical or electronic apparatus.

Certified to ISO 9001, CIC ensures superior quality of its goods through such advanced technologies and materials as Swiss-manufactured equipment (for the production of resin insulators), Araldite® epoxy resin, and technology transferred from Messwandler-Bau (MWB) of Germany.

Backed by 44 years of experience, CIC offers custom-made products, OEM/ODM services, and technical support tailored to the needs of its discerning clientele.


Low-Voltage Current Transformers / Extended Range Current Transformers (ERCTs) for Billing

ROS-A Series

For ≤ 600V power systems, these current transformers offer a 0.3 Metering Class accuracy. ERCT specifications also available. Secondary side includes a short-circuiting device. Terminal cover sealable. Various window diameters and current ratios.

About the Product

Resin-insulated current transformers ROS-A Series, designed for billing purposes and suited to power systems of 600-voltage or below, offer revenue metering of at least a Class 0.3 Accuracy and can be used for indoor application or in an outdoor enclosure. Current Ratios available are from 100:5A to 800:5A, and window diameter options are 38mm, 66mm, and 78mm. ROS-A Series current transformers of the Standard Specifications have a Thermal Rating Factor (RF) of up to 4.0. Those of the ERCT Specifications are able to maintain the rated accuracy and burden rating while measuring 1% ~ 150% of the rated current, surpassing the usual metering-class requirement (5% ~ 100%). All ROS-A Series current transformers have been type-tested by CIC’s Advanced Electricity Lab, a testing facility accredited by a member of ILAC.

Product Features

  • Standards: IEEE C57.13
  • Secondary side equipped with a short-circuiting device
  • Terminal cover provided for the secondary side
  • Sealable
  • Application: Indoors, or in an outdoor enclosure
  • Rated Voltage: Up to 0.72 kV
  • Frequency: 50 / 60 Hz
  • 0.3 Metering Class
  • Type-tested by a laboratory accredited by an ILAC member
  • Additional specification or customization may be requested to comply with various electrical standards and client requirements

Selection Table

Standard Specifications

Model

Current Ratio

Thermal Rating Factor (RF)

Accuracy & Burden (IEEE)

Window Diameter

Approx. Weight

At 30℃ Ambient Temperature

At 55℃ Ambient Temperature

ROS-38A

100 / 5A

4.0

4.0

0.3 B-0.2

38 mm

6.5 kg

ROS-66A

150 / 5A

4.0

4.0

0.3 B-0.1

66 mm

5.0 kg

200 / 5A

4.0

4.0

0.3 B-0.5

250 / 5A

4.0

4.0

0.3 B-0.5

ROS-78A

300 / 5A

4.0

2.9

0.3 B-0.5

78 mm

4.0 kg

400 / 5A

4.0

2.9

0.3 B-0.5

500 / 5A

3.0

2.4

0.3 B-0.5

600 / 5A

800 / 5A

2.0

1.8

0.3 B-0.5

2.0

1.5

0.3 B-0.5

ERCT Specifications

Model

Current Ratio

Thermal Rating Factor (RF)

Accuracy &

Burden (IEEE)

Window Diameter

Approx. Weight

ROS-66A

150 / 5A

1% ~ 150%

0.3 B-0.1

66 mm

5.0 kg

200 / 5A

1% ~ 150%

0.3 B-0.5

250 / 5A

1% ~ 150%

0.3 B-0.5

ROS-78A

300 / 5A

1% ~ 150%

0.3 B-0.5

78 mm

4.0 kg

400 / 5A

1% ~ 150%

0.3 B-0.5

500 / 5A

1% ~ 150%

0.3 B-0.5

600 / 5A

1% ~ 150%

0.3 B-0.5

800 / 5A

1% ~ 150%

0.3 B-0.5

Available Models

ROS-38A, ROS-66A, ROS-78A


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