Coil Molded Single-Phase Voltage Transformers (Potential Transformers), Indoor Use

Coil Molded Single-Phase Voltage Transformers (Potential Transformers), Indoor Use | Enhance Safety and Performance with Superior Epoxy Insulators | CIC

Based in Taiwan since 1974, CHALLENGE INDUSTRIAL CO., LTD. specializes in manufacturing high-quality electrical products, including Coil Molded Single-Phase Voltage Transformers (Potential Transformers), Indoor Use, 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.

View our voltage transformers for industrial use Current Transformers, Potential Transformers, Distribution Transformers, Electrical Reactors, Capacitors, Surge Protection Devices (SPD), Voltage Indicators, Current Sensors, Epoxy Bushings, Insulators and feel free to Contact Us.

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

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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.

Medium-Voltage Epoxy-Cast PTs

About the Product

Intended for power systems of 7.2 kV or below, these single-phase coil molded voltage transformers, or potential transformers, are compact and economical. Model EP-3SF2 features a laminated core and is fixed by two metal frames; cut-core models EP-3SF5 and EP-6SFK are fitted on a metal base. All of the models come with two fuses on the primary side and are insulated with Araldite^® epoxy resin. The EP-3SF/6SF Series is characterized by high moisture resistance and excellent electrical properties. In addition, the EP-6SFK model can be used as an auxiliary power source for circuit breaker operation (see Specifications).

(Model: EP-3SF2) Coil Molded Potential Transformer, Cut-Core

EP-3SF2

(Model: EP-3SF5) Coil Molded Potential Transformer (Cut Core)

EP-3SF5

(Model: EP-6SFK) Coil Molded Potential Transformer (Cut Core)

EP-6SFK

Specifications*

EP-3SF/6SF Series Coil Molded Single-Phase Potential Transformers - Specifications

* Other standards and specifications available.
** Models with a burden rating of 1000 VA or higher can be used as an auxiliary power source, also called a control transformer (CTR) or control power transformer (CPT), for circuit breaker operation (accuracy N/A).

Download DocumentsRelated Products

CIC Company Profile
Learn about our company: history, strengths, products, global locations, and our Advanced Electricity Lab.
【Product Brochure】Coil Molded Voltage Transformers (EP-3SF/6SF Series)
Easy-to-print document, containing product description and a selection table.
【Product Dimensions】Coil Molded Voltage Transformers (EP-3SF/6SF Series)
Download PDF for basic drawing(s) and dimensions of this product. For more detailed information, please contact CIC.
CT & PT Selection Guide: How to Choose a Current Transformer or Potential Transformer
How to select, based on application and power system attributes, the primary and secondary currents, burden, accuracy, rated frequency, type (indoor vs. outdoor), insulation material, etc.

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."
Conductive Shield Voltage Transformer (Potential Transformer) for 24 kV 4-Way Switchgear (Also Operation Power Source)
EPF-20FB
This voltage transformer is a single-phase, epoxy-resin-cast medium-voltage potential transformer designed to also function as an operation power source*, specifically paired with 24kV 4-Way Switchgear. It features a high-voltage elbow-type connector on the primary side and includes an internal high-voltage power fuse for protection. The exterior of the voltage transformer is coated with a conductive metal mixture for shielding, and waterproof treatment can be requested for the secondary side. The voltage transformer has a rated burden and accuracy of 600 VA / 3.0 CL.* Operation power source: In this application, the voltage transformer can also be referred to as a "control power transformer" (CPT), "control transformer" (CTR), "industrial control transformer," or a "machine tool transformer."
Low-Voltage Dry-Type Control Transformers
S Series
These low-voltage control power transformers, with Class A or Class H insulation, are economical products suitable for use with machine tools or industrial equipment at indoor locations with lower humidity. Also referred to as "control transformers" (CTR), "industrial control transformers," or "machine tool transformers," these control power transformers (CPT) can also be installed in low-voltage main panels or motor control panels as an auxiliary power source. This dry-type transformer is compact and easy to install.
12 kV & 24 kV Epoxy-Cast Voltage Transformer (Potential Transformer) or Control Power Transformer, as Power Source for Circuit Breaker Operation and Lighting
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This voltage transformer, cast with self-extinguishing epoxy resin, is a medium-voltage, indoor-type, single-phase potential transformer for a 12kV or 24kV power system for measuring and monitoring voltage signals. With a continuous output capacity of 4000 VA (max.), it can also serve in a small substation or a switchgear panel as a power source for circuit breaker operation and lighting equipment*.* Power source for circuit breaker operation and lighting equipment: In this application, the voltage transformer can also be referred to as a "control power transformer" (CPT), "control transformer" (CTR), "industrial control transformer," or a "machine tool transformer."
3.6 kV Current Transformer, Coil Molded
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Two-Core Coil Molded Current Transformer with Cut Cores, 3.6 kV
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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.
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3.6 kV Two-Core Epoxy-Cast Current Transformer
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Epoxy-Cast Window-Type Current Transformers for Indoor Application, 3.6 kV
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