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Split-Core Low-Voltage Current Transformers (Rectangular Window-Type) / 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 Split-Core Rectangular-Window Current Transformer - Resin Encapsulated - Low Voltage - Indoor, 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.

Challenge Industrial Co., Ltd. (CIC) stands at the forefront of electrical innovation, specializing in the manufacturing of current transformers, voltage transformers, distribution transformers, epoxy insulators, and power capacitors. With a legacy built on over 45 years of engineering excellence and leveraging advanced German technology, CIC commits to delivering high-quality, ISO-certified electrical solutions. Their comprehensive product range, paired with an ISO-certified approach and a TAF-accredited laboratory, ensures reliability and performance for a diverse global market. CIC is your go-to source for electrical components that power progress and efficiency.

CIC has been offering customers high-capacity power capacitors since 1974, both with advanced technology and 50 years of experiences, CIC ensures each customer's demands are met.


Split-Core Rectangular-Window Current Transformer - Resin Encapsulated - Low Voltage - Indoor

ES-1S-C Series

Our split-core, rectangular-window current transformers from the ES-1S-C Series are resin-encapsulated for water resistance and self-extinguishing properties. These single-core current transformers work with protective relays or measurement instruments to monitor current flow per IEC/IEEE low voltage standards (720 volts / 600 volts, or 0.72 kV / 0.6 kV). Window-type design splits open without removing wiring for simple mounting on existing systems. Thermal withstand is 40x nominal current for 1 second. A choice of accessories helps simplify mounting and installation.

Rectangular Split-Core Resin-Insulated LV CT Instrument Transformer, 600V or 720V

About the Product

Intended for switchgear-panel manufacturers and other users, these rectangular, resin-insulated, low-voltage window-type current transformers are self-extinguishing and highly water-resistant. Each of these current transformers can be mounted on a busbar (the busbar can be either horizontally or vertically installed in the switchgear panel). Alternatively, the current transformer can be fixed directly to the switchgear panel; in this case, wiring can be done with a busbar or with insulated copper wires. The product comes with one type of mounting accessories, to be chosen by the customer from available options.

Features of the ES-1S-C Series

  • Single-core
  • Split-core window-type
  • For use with protective relays, or with measuring or monitoring instruments
  • Can be installed onto an existing system without cutting (or removing) the primary busbar or insulated wires

Specifications

  • Standard: IEC or IEEE
  • For indoor use
  • Rated voltage: ≦ 0.72 kV
  • Frequency: 50 or 60 Hz
  • AC/BIL: 3/- kV
  • Ith = 40 In/1S
  • Included: a choice of mounting accessories
  • Other specifications and standards available upon request

Selection Table for Low-Voltage Rectangular-Type Current Transformer ES-1S

The following table outlines frequently requested specifications for our ES-1S Series rectangular low-voltage current transformers; contact us if you require models with alternative standards or specifications tailored to your application.

Series Model Primary
Current (A)
Secondary Current (A) Burden/Accuracy
(IEC)
Approx.
Weight
(kg) 
Additional
Info
Core 1 Core 2
ES-1S-A ES-1S-60A 400~800 5  -  30VA/1.0 or 15VA/0.5 2.1 Single-Core
ES-1S-80A * 600~1200 5  -  30VA/1.0 or 15VA/0.5 2.1 Single-Core
ES-1S-100A * 1000~2000 5  -  30VA/1.0 or 15VA/0.5 2.2 Single-Core
ES-1S-120A * 2500~4000 5  -  40 VA/1.0 or 30VA/0.5 3.7 Single-Core
ES-1S-165A * 4000~7000 5  -  40 VA/1.0 or 30VA/0.5 4.3 Single-Core
ES-1S-B ES-1S-100B * 1000~2000 5 5 15VA/5P20+30VA/0.5 10 Two-Core
ES-1S-120B * 2500~4000 5 5 15VA/5P20+30VA/0.5 9.5 Two-Core
ES-1S-C ES-1S-165C 800~1000 5  -  7.5VA/5P10 6 Split-Core
(Single-Core) 
1250~1600 5  -  10VA/5P10 6 Split-Core
(Single-Core) 

*  Models marked with an asterisk require caution when mounted on a busbar. Care must be taken, when the switchgear panels are being moved or when during an earthquake, to prevent the current transformer from sliding due to its weight.


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