Transformers Searched | Enhance Safety and Performance with Superior Epoxy Insulators | CIC

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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Transformers | Revolutionize Your Energy Systems with Advanced Distribution Transformers | CIC

Based in Taiwan since 1974, CHALLENGE INDUSTRIAL CO., LTD. specializes in manufacturing high-quality electrical products, including Transformers, 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.

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  • ABS-Encased Current Transformer - Low Voltage - Window Type - Indoor Use
    ABS-Encased Current Transformer - Low Voltage - Window Type - Indoor Use
    POS Series

    Window-type current transformers in the POS Series, for 600-Volt or 0.72 kV power systems, feature a compact, lightweight ABS housing that enables flexible installation, even in tight spaces like motor control centers. Their high-quality coil and annealed core deliver rated accuracy per international standards. Primary connections suit busbar or insulated wiring. With up to 40 VA burden and 0.5, 1.0 or 3.0 accuracy class, these versatile CTs meet demanding application needs. The self-extinguishing ABS enclosure ensures safety. Top-facing terminals speed wiring while covers protect connections.

  • Low-Voltage (LV) Resin-Encapsulated Current Transformer - Window Type - Indoor Use
    Low-Voltage (LV) Resin-Encapsulated Current Transformer - Window Type - Indoor Use
    EOS-RN / EOS-RM Series

    Resin-encapsulated current transformers in the EOS-RN and EOS-RM series, for indoor applications under 600 Volts or 0.72 kV, have 33-120mm windows suiting busbar/wiring primaries from 100-3200A. Robust build quality and fixed metal base ensure reliable performance. Economic models are available.

  • Single-Core Rectangular-Window Current Transformer - Resin Encapsulated - Low Voltage - Indoor
    Single-Core Rectangular-Window Current Transformer - Resin Encapsulated - Low Voltage - Indoor
    ES-1S-A Series

    Rectangular current transformers from the ES-1S-A series are single-core (solid-core), low-voltage (600 or 720 volts / 0.6 or 0.72 kV), resin-encapsulated current transformers. Their window-type design for easy mounting on busbars. Designed to work with measurement instruments to enable monitoring per IEC/IEEE standards, these current transformers deliver thermal withstand up to 40x nominal current for 1 second. Choose mounting accessories to simplify installation in your specific application.

  • Two-Core Rectangular-Window Current Transformer - Resin Encapsulated - Low Voltage - Indoor
    Two-Core Rectangular-Window Current Transformer - Resin Encapsulated - Low Voltage - Indoor
    ES-1S-B Series

    Rectangular current transformers of the ES-1S-B series are dual-core (double-core) window-type models for versatile installation. The two-core design makes this a dual-purpose CT, allowing simultaneous use with measurement devices and protective relays per IEC/IEEE low voltage standards (720 volts / 600 volts, or 0.72 kV / 0.6 kV). Resin insulation delivers water resistance and self-extinguishing properties. These current transformers withstand 40x thermal current for 1 second. A choice of mounting accessories is included.

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

  • Split-Core Rectangular-Window Current Transformer - ABS Encased - Low Voltage - Indoor
    Split-Core Rectangular-Window Current Transformer - ABS Encased - Low Voltage - Indoor
    PSC Series

    Split-core rectangular-window current transformers of the PSC Series are ABS-encased models featuring moisture resistance and self-extinguishing properties for safety. These low-voltage (720 volts / 600 volts, or 0.72 kV / 0.6 kV) current transformers are specially designed for easy retrofitting in existing switchgear panels without wiring disruption. Special mounting accessories help facilitate installation.

  • Low-Voltage Current Transformer for Higher Current Ratio and Higher Accuracy - Window Diameter up to 160mm
    Low-Voltage Current Transformer for Higher Current Ratio and Higher Accuracy - Window Diameter up to 160mm
    CR-1S Series

    Low-voltage current transformers of the CR-1S Series, available in multi-ratio or single-ratio models, offer higher current ratios (800-4000/5A), higher accuracy, and larger window diameters (even to 160mm or 6.3”) for convenient installation over high current busbars. These epoxy-resin-cast low-voltage (720 volts / 600 volts, or 0.72 kV / 0.6 kV) current transformers facilitate wiring while decreasing contact failure rates.

  • Bushing Current Transformers for 23 kV C-GIS
    Bushing Current Transformers for 23 kV C-GIS
    EO1M6, EO1M20, EO1M150

    These epoxy-cast multi-ratio bushing current transformers (BCTs, or bushing CTs) are typically installed in 23 kV C-GIS (cubicle-type gas-insulated switchgear) for use with measuring or monitoring instruments, or protective relays.

  • Zero-Phase Current Transformers (ZCT) for Ground-Fault Protection
    Zero-Phase Current Transformers (ZCT) for Ground-Fault Protection
    EZ Series

    Designed to protect the power system against leakage and earth faults, these zero-phase current transformers (ZCT) come in various window diameters. Epoxy-cast coil.

  • Low-Voltage Current Transformer / Extended Range Current Transformer (ERCT) for Revenue Metering, Window-Type
    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.

  • Low-Voltage Ring-Core Protective-Type Current Transformer for Outdoor Use (Epoxy-Cast)
    Low-Voltage Ring-Core Protective-Type Current Transformer for Outdoor Use (Epoxy-Cast)
    EO1MC20R

    Outdoor, ring-core (window-type) protective (or monitoring) current transformer for power companies or HV power systems. Converting high AC currents into signals to be received by the relay. Cycloaliphatic Epoxy.

  • Low-Voltage Split-Core Protective-Type Current Transformer for Outdoor Use (Epoxy-Cast)
    Low-Voltage Split-Core Protective-Type Current Transformer for Outdoor Use (Epoxy-Cast)
    EO1MD20

    Window-type (split-core), outdoor, protective (or monitoring) current transformer for power companies or HV power systems. Converting high AC currents into signals to be received by the relay. Cycloaliphatic Epoxy.

  • Dry-Type Bushing Current Transformers for GIS or Power Transformers
    Dry-Type Bushing Current Transformers for GIS or Power Transformers
    TB-1M Series

    Suited to power transmission and distribution systems and intended to work with measuring or monitoring instruments, or with protective relays, these bushing CTs (BCTs) can also be used with GIS or in conjunction with power transformers bushings. Insulation tape or epoxy resin as insulation material.

  • 3.6 kV Current Transformer, Coil Molded
    3.6 kV Current Transformer, Coil Molded
    EW-3S

    For measuring or monitoring instruments, this medium-voltage, indoor, coil molded current transformer is often used with the main panel or the motor control panel of a 3.6 kV (max.) power system. Insulated with Araldite® epoxy resin. Compact and easy to install.

  • Two-Core Coil Molded Current Transformer with Cut Cores, 3.6 kV
    Two-Core Coil Molded Current Transformer with Cut Cores, 3.6 kV
    EW-3C

    2-core (core type: cut-core), medium-voltage coil molded current transformer. Often used with the main panel or the motor control panel of a 3.6 kV (max.) power system. Good for protection. Suited to measuring and monitoring instruments. Araldite® epoxy resin.

  • 3.6 kV / 7.2 kV Current Transformers (1-Core / 2-Core & Single-Ratio / Dual-Ratio Options)
    3.6 kV / 7.2 kV Current Transformers (1-Core / 2-Core & Single-Ratio / Dual-Ratio Options)
    CR-3(6)S-T Series

    Intended for the main panel or the motor control panel of a 3.6/7.2 kV power system and designed to be used with measuring or monitoring instruments, or with protective relays. Each CT has a busbar terminal. Insulated with Araldite® epoxy resin.

  • 3.6 kV Two-Core Epoxy-Cast Current Transformer
    3.6 kV Two-Core Epoxy-Cast Current Transformer
    ER-3C

    Offering a higher rated current ratio, this medium-voltage, two-core current transformer is suited to the main panel or the motor control panel of a 3.6 kV (max.) power system and can be used with measuring or monitoring instruments, or with protective relays. Araldite® epoxy resin.

  • Epoxy-Cast Window-Type Current Transformers for Indoor Application, 3.6 kV
    Epoxy-Cast Window-Type Current Transformers for Indoor Application, 3.6 kV
    CR-3S Series

    2-core & single-core models. Indoor window-type current transformers for the main panel or motor control panel of a MV (≦ 3.6 kV) power system. Good for protection and appropriate for measuring and monitoring instruments. Araldite® epoxy resin.

  • Coil Molded Current Transformer with Cut Core, 12 kV
    Coil Molded Current Transformer with Cut Core, 12 kV
    EW-10SH

    Cut-core, medium-voltage, indoor-use, coil molded current transformer intended for a 12 kV (max.) power system and suited for measuring or monitoring instruments. Insulated with Araldite® epoxy resin.

  • 12 kV Two-Core Current Transformers
    12 kV Two-Core Current Transformers
    EWF-10D Series

    2-core current transformers designed for 12 kV (max.) power systems for use with measuring (or monitoring) instruments and protective relays, these products are cast in Araldite® epoxy and meet the requirements of all major electrical standards.

  • Multi-Ratio Current Transformers (Single-Core & Two-Core Types) for 15 kV (max.) Power Systems
    Multi-Ratio Current Transformers (Single-Core & Two-Core Types) for 15 kV (max.) Power Systems
    EO-10SC Series

    Single-core and 2-core indoor window-type current transformers for power systems ≦ 15 kV. Primary current: 500~3000 A (single-ratio or multi-ratio). Araldite® epoxy resin. Used with measuring or monitoring instruments, or for protection.

  • 24 kV Epoxy-Cast Current Transformers for Indoor Application
    24 kV Epoxy-Cast Current Transformers for Indoor Application
    EWF-20DA, EWF-20DB, EWF-20DD, EWF-20DE, EWF-20DS

    For use in conjunction with energy meters or protective relays. Available in single-core, 2-core, and 3-core models. Insulated with Araldite® epoxy resin. Custom-made to meet various requirements.

  • 24 kV Two-Core Current Transformer (“U-Shaped Top” Design)
    24 kV Two-Core Current Transformer (“U-Shaped Top” Design)
    EWF-20DI

    2-core epoxy-cast current transformer for a 24 kV (max.) power system. For use with measuring or monitoring instruments, and protective relays. “U-shaped top” design for safety and for a shorter distance between two current transformers installed side-by-side, thus reducing the required width of the switchgear panel.

  • Current Transformer for SF6 Gas-Insulated MOF Panel
    Current Transformer for SF6 Gas-Insulated MOF Panel
    MOF-24

    For power companies. To be mounted inside the SF6 gas-insulated MOF panel of a 25.5 kV (max) power system. With 2 primary coils, this current transformer offers 2 current ratios while maintaining the required accuracy and burden rating at each current ratio. Insulated with Araldite® epoxy resin.

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