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Low-Voltage Current Transformers or Extended-Range Current Transformers (ERCT) for Revenue Metering (ROS-A Series) / Serving a diverse client base around the world, CIC is a leading manufacturer and supplier of current transformers, potential transformers (voltage transformers), distribution transformers, epoxy insulators, electronic meters, and other electrical and electronic products.

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Based in Taiwan since 1974, CHALLENGE INDUSTRIAL CO., LTD. specializes in manufacturing high-quality electrical products, including Low-Voltage Current Transformer / Extended Range Current Transformer (ERCT) for Revenue Metering, Window-Type, current transformers, voltage transformers, distribution transformers, epoxy insulators, and power capacitors. With over 45 years of expertise and technology collaboration with Germany's MWB, CIC is ISO certified and offers products recognized for reliability in various industrial applications.

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Low-Voltage Current Transformers or Extended-Range Current Transformers (ERCT) for Revenue Metering (ROS-A Series)
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Low-Voltage Current Transformer / Extended Range Current Transformer (ERCT) for Revenue Metering, Window-Type

ROS-A Series

Extended-Range Current Transformers (ERCT) for Revenue Metering offer precision in billing, with an operating range for accuracy up to 1% ~ 200% of rated current. Our window-type resin-cast current transformers “ROS-A Series” for low-voltage or LV (720 volts / 600 volts, or 0.72 kV / 0.6 kV) applications come in both ERCT and standard varieties. Range of specifications include Metering Class 0.15, Thermal Rating Factor up to 4.0, Current Ratios from 100:5A to 4000:5A, and multiple window diameter options. Special IP65 outdoor edition is available.

High Accuray Cast Resin LV CT Instrument Transformer

About the Product

Resin-insulated current transformers ROS-A Series, designed for billing purposes and suited to 0.72 kV (IEC) or 0.6 kV (IEEE) power systems, offer revenue metering accuracy of Class 0.15 to Class 0.3. Current Ratios available are from 100:5A to 4000:5A, and window diameter options are 38mm, 66mm, 78mm, and 146mm.

ROS-A current transformers are available in two series: Standard Series and ERCT Series (Extended Range Current Transformers). The Standard Series current transformers have a Continuous Thermal Rating Factor of up to 4.0 (see Note 1). The ERCT Series are able to maintain the rated accuracy and burden while measuring 1% ~ 150% or even 1% ~ 200% of the rated current, surpassing the usual metering-class requirement (5% ~ 100%).

All ROS-A 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 C57.13-2016 & IEC 61869-2:2012
  • Secondary side equipped with a short-circuiting device
  • Terminal cover provided for the secondary side
  • Sealable
  • Usage Environment: Indoors, or outdoors (See Note 2).
  • Rated Voltage: Up to 0.72 kV
  • Frequency: 60 Hz
  • Metering Class: 0.15 to 0.3
  • 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

Notes:

1. The Continuous Thermal Rating Factor, also called Thermal Rating Factor (TRF) or Rating Factor (RF), signifies how much the “actual primary current” can exceed the rated Primary Current and still meet accuracy and temperature guidelines. For example, a Rating Factor of 2.0 means the current transformer can continuously handle double its rated Primary Current without overheating.

2. While the product's water-repellent property and standard secondary cover allow for potential outdoor operation under certain conditions, it's not guaranteed to withstand all weather elements. For full outdoor use, contact CIC for our special outdoor option, providing IP65 protection.


Selection Tables for LV Current Transformers for Revenue Metering, ROS-A Series

The following tables outline frequently requested specifications for our LV Cast-Resin Current Transformers ROS-Series for Revenue Metering; contact us if you require models with alternative standards or specifications tailored to your application.



ERCT Series & Standard Series per IEEE C57.13-2016

LV Current Transformer ROS-A Series - Specifications - ERCT Series & Standard Series per IEEE C57.13-2016
* ERCT Operating Range for Accuracy: 1% ~ 150% of Rated Current
Note: Other standards and specifications available



ERCT Series per IEC 61869-2:2012

LV Current Transformer ROS-A Series - Specifications - ERCT Series per IEC 61869-2:2012
** ERCT Operating Range for Accuracy: 1% ~ 200% of Rated Current



LV Current Transformer ROS-A Series - product designs

Available Models

ROS-38A, ROS-66A, ROS-78A, ROS-146A



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