MV Indoor Single-Phase and Three-Phase Voltage Transformers 3.6-7.2 kV | Elevate Power Distribution: Explore Premium Voltage Transformers | CIC

3.6-7.2 kV Indoor VT Instrument Transformers | 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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Medium-Voltage (MV) Voltage Transformers / Potential Transformers 3.6-7.2 kV | 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 Medium-Voltage (MV) Voltage Transformers / Potential Transformers 3.6-7.2 kV, 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 45 years of experiences, CIC ensures each customer's demands are met.

Medium-Voltage (MV) Voltage Transformers / Potential Transformers 3.6-7.2 kV

3.6-7.2 kV Indoor VT Instrument Transformers

MV Indoor Single-Phase and Three-Phase Voltage Transformers 3.6-7.2 kV
MV Indoor Single-Phase and Three-Phase Voltage Transformers 3.6-7.2 kV

Voltage Transformer 3.6-7.2 kV Series by CIC is primarily designed to provide indoor VT (PT) solutions. This includes coil-molded voltage transformers that can also be used as control and operating power sources. Additionally, the lineup includes fully molded cast resin voltage transformers and medium-voltage three-phase grounding voltage transformers.

The primary insulation material employed in this series is the internationally renowned Araldite® epoxy resin from Huntsman Advanced Materials (formerly Ciba-Geigy). This choice ensures the utmost reliability and performance of the voltage transformers.

Customization is a key feature of CIC's voltage transformers, allowing them to be tailored to meet specific regulatory requirements, including those outlined by IEC, IEEE, and other industry standards.

To guarantee the quality and precision of our voltage transformers, type tests and routine tests are meticulously carried out at CIC's Advanced Electricity Lab. This facility is accredited by TAF, a member of ILAC, underscoring our commitment to maintaining the highest standards.

With decades of experience in manufacturing instrument transformers, CIC also provides ODM/OEM services. CIC's medium-voltage voltage transformers have been widely adopted by electric utilities, factories, major projects and construction companies globally for metering and distribution applications.


Explore our featured selections below for this category. Click any product to learn more.

For our full range or specific inquiries, please contact us directly.

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  • Coil Molded Single-Phase Voltage Transformers (Potential Transformers), Indoor Use
    Coil Molded Single-Phase Voltage Transformers (Potential Transformers), Indoor Use
    EP-3SF/6SF Series

    Voltage transformers of the EP-3SF/6SF Series are coil-molded, single-phase, indoor-type, medium-voltage, epoxy-resin-insulated potential transformers suitable for power systems of 7.2kV or below. Made with either a laminated core (Model EP-3SF2) or a cut core (EP-3SF5 & EP-6SFK), the voltage transformer has two power fuses attached to the primary side. Specific models from this series can be used as an auxiliary power source for circuit breaker operation — that is, as a control power transformer (CPT), also referred to as a control transformer (CTR), industrial control transformer, or machine tool transformer.


  • Voltage Transformers (Potential Transformers) as Circuit Breaker Operation Power Source
    Voltage Transformers (Potential Transformers) as Circuit Breaker Operation Power Source
    EPF-3SF1, EPF-6SF2

    Voltage transformers EPF-3SF1 and EPF-6SF2 are medium-voltage, indoor-type potential transformers cast in epoxy resin, commonly installed on switchgear (3.3kV or 6.6kV) to serve as an auxiliary power source* for circuit breaker operation. Positioned atop the switch as an operational power source, these transformers can handle relatively high outputs for short durations. Featuring Class-F heat-resistant insulation material for the coils, each voltage transformer is equipped with two power fuses on the primary side to safeguard against overload and short-circuit currents.* Auxiliary power source: In this application, the voltage transformer may also be referred to as a "control power transformer" (CPT), "control transformer" (CTR), "industrial control transformer," or a "machine tool transformer."


  • Three-Phase Grounding Voltage Transformer (GVT), or Grounding Potential Transformer (GPT), for MV Indoor Applications
    Three-Phase Grounding Voltage Transformer (GVT), or Grounding Potential Transformer (GPT), for MV Indoor Applications
    EGP-3DF, EGP-6DF

    This ground voltage transformer (GVT), or ground potential transformer (GPT), is a three-phase medium-voltage (MV) potential transformer for indoor applications. With a fuse for each phase, this PT (VT) features epoxy-insulated coils and a five-legged (five-limbed) laminated core. This voltage transformer is used with measuring or monitoring instruments, or for ground-fault protection.



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