Indoor and Outdoor Voltage Transformers (Potential Transformers) | Elevate Power Distribution: Explore Premium Voltage Transformers | CIC

Low-Voltage / Medium-Voltage Indoor & Outdoor Voltage Transformers (VT) | 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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Voltage Transformers / Potential Transformers (VT/PT) - Instrument 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 Voltage Transformers / Potential Transformers (VT/PT) - Instrument 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 45 years of experiences, CIC ensures each customer's demands are met.

Voltage Transformers / Potential Transformers (VT/PT) - Instrument Transformers

Low-Voltage / Medium-Voltage Indoor & Outdoor Voltage Transformers (VT)

Indoor and Outdoor Voltage Transformers (Potential Transformers)
Indoor and Outdoor Voltage Transformers (Potential Transformers)

Voltage transformers (VT), also known as potential transformers (PT), are a specialized type of transformers, collectively referred to as 'instrument transformers' alongside current transformers (CT). Voltage transformers usually consist of an iron core, a primary winding, and one or two secondary windings. In application, the primary winding is connected in parallel to an AC circuit with a voltage exceeding 200V. The VT converts the higher primary voltage (V1) to a standardized low secondary voltage (V2), typically 100V or 110V maximum (according to prevalent IEC or IEEE standards today). The secondary voltage is then utilized by instruments for purposes such as metering, monitoring, and protection through relays.

Based on the primary voltage rating, VTs can be classified into low, medium and high voltage types. They can also be categorized as indoor or outdoor types based on application; and as metering or protective types based on function.

CIC is the first manufacturer in Taiwan to specialize in cast resin voltage transformers, with over 45 years of experience in R&D and production of indoor VTs. CIC also utilizes advanced technology transferred from MWB Messwandler-Bau in Germany to manufacture outdoor medium-voltage metering VTs. The main insulation material used in CIC voltage transformers is Araldite® epoxy resin (cycloaliphatic epoxy for outdoor units), ensuring consistently high quality.

CIC performs type tests and routine tests on all voltage transformers at its in-house Advanced Electricity Lab, accredited by TAF (an ILAC member). From design, type testing, to production and final testing, CIC self-controls the entire process to guarantee quality and on-time delivery.

With a wide range of ratings in voltage ratio, burden, insulation class, materials, construction and dimensions, CIC voltage transformers meet various application requirements. VTs can also be customized to fit specific needs. CIC provides ODM/OEM services and manufactures products meeting different international standards. CIC voltage transformers have successfully reached markets in countries such as the United States, Canada, Russia, and Japan, with extensive use in power utilities, factories, major projects, electrical contractors for metering and distribution applications.

Click on any category below to explore our products. You can also contact us directly and the CIC team will be happy to assist you.



  • Low-Voltage (LV) Voltage Transformers / Potential Transformers & Control Transformers 0.72 kV max.
    Low-Voltage (LV) Voltage Transformers / Potential Transformers & Control Transformers 0.72 kV max.
    Control Power Transformers & Instrument Transformers, Low-Voltage or Industrial Use

    Low-Voltage Voltage Transformers (VT, or PT) and Control Power Transformers (CPT) Series are designed for control and monitoring of electromechanical equipment. With compact size, efficient heat dissipation, and aesthetic design, they are ideal for use in the electrical panel as voltage transformers or as control and operating power transformers in industrial machinery and equipment.


  • Medium-Voltage (MV) Voltage Transformers / Potential Transformers 3.6-7.2 kV
    Medium-Voltage (MV) Voltage Transformers / Potential Transformers 3.6-7.2 kV
    3.6-7.2 kV Indoor VT Instrument Transformers

    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.


  • Medium-Voltage (MV) Voltage Transformers / Potential Transformers 12-24 kV
    Medium-Voltage (MV) Voltage Transformers / Potential Transformers 12-24 kV
    Indoor & Outdoor VT Instrument Transformers for Metering, Distribution and More

    12-24 kV Voltage Transformers (VT) by CIC constitute a stellar range of indoor and outdoor potential transformers designed for various electrical applications, including metering, distribution, and specialized functions. Distinguished by their unique and advanced features, along with superior performance, this remarkable series of voltage transformers has garnered significant interest and widespread acclaim from numerous customers in the expansive international market.


  • Medium-Voltage (MV) Voltage Transformers / Potential Transformers 36 kV
    Medium-Voltage (MV) Voltage Transformers / Potential Transformers 36 kV
    Indoor & Outdoor Epoxy Resin Cast VT Instrument Transformers for Metering Units and More

    36 kV Voltage Transformers (VT) by CIC include both indoor and outdoor potential transformers (PT). The series features single-pole resin-cast voltage transformers, capable of being combined into three-phase voltage transformer and Grounding Potential Transformer sets, alongside metal-clad-for-shielding resin-cast voltage transformers. Additionally, there are models specifically designed for power billing Metering Outfit (MOF), renowned for their exceptional UV resistance and enduring resilience, trusted by power companies across countries for over two decades.CIC's epoxy resin-cast voltage transformers utilize Huntsman's (formerly Ciba-Geigy in Switzerland) internationally acclaimed Araldite® epoxy resin. The outdoor models are meticulously crafted with UV-resistant cycloaliphatic epoxy resin, ensuring unwavering quality. Type tests and routine tests for CIC's voltage transformers are executed at CIC's Advanced Electricity Lab, accredited by TAF, a member of ILAC. With decades of experience, CIC not only manufactures voltage transformers but also offers customization and ODM/OEM services. Widely adopted by power utilities, major projects, and construction companies worldwide, CIC's voltage transformers play a crucial role in metering and distribution projects.