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ISO 9001:2008

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ODM Y OEM

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CE、TUV、CB、RoHS

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Current Transformer Supplier

Willmall Current Transformer options support project procurement with configurable ratio, rated current, and output form, including split-core designs for retrofit.

Three Phases 22mm Digital Meter Voltmeter Ammeter Voltage Current Frequency Meter (4)

Three Phases 22mm Digital Meter Voltmeter Ammeter Voltage Current Frequency Meter

Three Phase 22mm Digital Panel Meter Voltmeter Ammeter, Voltage Current Frequency Meter, LED Display, DIN Rail/Panel Mount for Industrial Control.
Voltmeter and Current Panel with LED Display and Transformer DIN Rail AC 80 300 (1)

Voltmeter and Current Panel with LED Display and Transformer DIN Rail AC 80-300V 0-99 a

DIN Rail Voltmeter and Ammeter Panel with LED Display, Built-In Current Transformer, AC 80–300V Voltage Range, 0–99A Measurement.
Y Ctk Series Circular Zero Open Sequence Residual Current Transformer

High Accuracy Mini Split Core Current Transformer for Energy Electricity Meter

High Accuracy Mini Split Core Current Transformer for Energy Electricity Meter, KF Series 5A–1000A, 333mV Output, Clamp-On Hinged Design.
Chk F Rectangular Residual Current Transformer (2)

Chk-F Rectangular Residual Current Transformer

CHK-F Rectangular Residual Current Transformer, Low Voltage Core-Through Zero Sequence CT, 63A–2000A, High Sensitivity, Flame-Retardant Epoxy, GB14287.2 Compliant.
CE Arrpove Low Voltage Current Transformer Dx Series

CE Arrpove Low Voltage Current Transformer Dx Series

DX Series CE Approved Low Voltage Current Transformer (DX-20/DX-30/DX-40), 0.66kV, Class 1.0, Cable & Busbar CT, DIN Rail or Screw Mount.
High Quality Rct Mr Series Low Voltage Ring Type Electric Current Power Transformer (2)

High Quality Rct Mr Series Low Voltage Ring Type Electric Current Power Transformer

RCT MR Series Low Voltage Ring Type Current Transformer, 5A–5000A, 0.66kV, Class 0.5/1.0/1.3, 50/60Hz, Panel or Busbar Mount.
0 2s Electricity Current Transformer Manufacturers Oil Filled Current Transformer (2)

0.2s Electricity Current Transformer Manufacturers Oil Filled Current Transformer

0.2S Accuracy Electricity Current Transformer, Oil-Filled Split Core CT for Energy Metering, 0.66kV Low Voltage, Clamp-On Design for RMU & Substations.
Split Core Current Transformer Cts Split Core Current Transformer CT Current Transformer

Split Core Current Transformer Cts Split Core Current Transformer CT Current Transformer

Split Core Current Transformer (CT), 0.66kV Low Voltage Clamp-On CT for Measurement & Protection, Lightweight Openable Design for RMU, RTU & FTU Systems.
Circular Residual Current Transformer for Electronic Instrument

Circular Residual Current Transformer for Electronic Instrument

Circular Residual Current Transformer for Electronic Instruments, 0.66kV Split Core Zero Sequence CT, Clamp-On Design for RMU, RTU & FTU Applications.
Ring Distribution Current Transformer Residual Zero Sequence Current Transformer (5)

Ring Distribution Current Transformer Residual Zero Sequence Current Transformer

Ring Distribution Residual Zero Sequence Current Transformer, Split Core 0.66kV Low Voltage CT, Clamp-On Design for RMU, RTU & FTU Sampling.
Low Voltage AC 0 66kv Residual Current T

Low Voltage AC 0.66kv Residual Current Transformer

Low Voltage AC 0.66kV Residual Current Transformer, Split Core Clamp-On CT, Lightweight Openable Design, Easy Installation for Switchgear and Substations
Low Voltage Residual Leakage Current (2)

Low Voltage Residual Leakage Current Transformer Sensor Output 5mA 2mA 0.5mA for Motor Protector Electrical Fire Monitoring Device

Low Voltage Residual Leakage Current Transformer Sensor 0.5mA–5mA Output, Rectangular Core-Through Zero Sequence CT, Flame-Retardant Epoxy, GB14287.2 Compliant.

Chk Ctkd Industrial Control Open and Close Outdoor Waterproof Residual Current Transformer

Chk-Ctkd Industrial Control Open and Close Outdoor Waterproof Residual Current Transformer

CHK-CTKD Industrial Control Open/Close Residual Current Transformer, Outdoor Waterproof Zero Sequence CT, Epoxy Resin Casting, High Sensitivity Leakage Monitoring.

Y Ctk Series Circular Zero Open Sequence Residual Current Transformer (4)

Y-Ctk Series Circular Zero Open Sequence Residual Current Transformer

Y-CTK Series Circular Zero Sequence Residual Current Transformer, Open Core Design, mA-Level Leakage Detection, GB14287.2 Compliant, Core-Through Installation.
Residual Current Transformer Open Closed Zero Sequence Leakage Fire Monito

Residual Current Transformer Open- Closed Zero Sequence Leakage Fire Monitoring

Residual Current Transformer Open/Closed Type Zero Sequence Leakage CT for Fire Monitoring, Epoxy Resin Casting, 5A–630A Input, Panel or Cable Mount.
Lzzbj9 10A1 Single Phase Indoor Current Transformer Class Epoxy Resin (4)

Lzzbj9-10A1 Single Phase Indoor Current Transformer Class Epoxy Resin & Copper Toroidal Coil

LZZBJ9-10A1 Single Phase Indoor Current Transformer, 10kV Epoxy Resin Cast CT with Copper Toroidal Coil, 50/60Hz, Busbar/Cable Mount.
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Wilmall Current Transformer Manufacturer

Willmall provides Current Transformer configurations to support procurement review, including selectable ratio, rated current, and output form for panel and retrofit projects.
  • Optional transformer ratio, rated current, and output form to align with metering or protection secondary requirements
  • Temperature-resistant and flame-retardant material specification for installation in electrical enclosures
  • Safety isolation design characteristic of instrument transformer applications between primary and secondary circuits
  • Open/split type Current Transformer option for retrofit on energized conductors during uninterrupted power supply upgrades
  • Documentation-oriented configuration approach intended to facilitate project acceptance and procurement review
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What is a Current Transformer?

A Current Transformer is an instrument transformer that converts a primary AC current on a conductor into a scaled secondary current suitable for measurement or protection devices. The secondary circuit is intended for connection to meters, relays, or monitoring inputs based on the selected output form.

How does a Current Transformer ratio relate to the measured current?

Current Transformer ratio defines the relationship between primary current and secondary output. Selection of transformer ratio and rated current is based on expected operating current range and the input specification of the connected device to ensure correct scaling.

Which output form should be selected for meters or protection relays?

Output form selection depends on the secondary input requirement of the meter or relay. Engineering review typically confirms the required secondary signal type and the wiring interface so the Current Transformer output form matches the receiving terminal specification.

How is an open/split type Current Transformer used for retrofit work?

Open/split type Current Transformer designs allow installation around an existing conductor without disconnecting the conductor. Installation practice generally includes verifying conductor routing, ensuring mechanical closure of the split core, and connecting the secondary to the intended measurement or protection circuit.

When should temperature-resistant and flame-retardant construction be specified?

Temperature-resistant and flame-retardant construction is specified when Current Transformer installation occurs inside electrical enclosures or environments where elevated temperature and material performance requirements apply. Specification review typically aligns material characteristics with the project’s cabinet and site conditions.