Three-Phase Combined Current Transformer

The three-phase integrated current transformer is a compact CT solution developed for outdoor pole-mounted switches. It is installed directly on the three-phase bushings of the breaker, enabling short-circuit protection, zero-sequence (ground-fault) protection, and auxiliary power supply for the controller.

This series can also be mounted on the incoming and outgoing bushings of RMUs for current measurement, energy metering, and microprocessor-based protection.

Product Detail

Overview

This series can also be mounted on the incoming and outgoing bushings of RMUs for current measurement, energy metering, and microprocessor-based protection.

By solving the limited space issue inside pole-mounted switches, the product has been widely adopted in models such as ZW20, ZW27, ZW28, and VSP5, and has demonstrated stable and reliable performance in long-term operation.

Multiple models are available based on different current ratios, accuracy classes, and rated burdens. Detailed specifications can be found in the corresponding parameter tables.

Technical Specifications

Rated Secondary Current: 5 A or 1 A

Application	Measuring CT			Protection CT			Dual-Winding CT
Rated Primary Current	Accuracy Class and Rated Burden (VA)			Accuracy Class and Rated Burden (VA)			Composite Accuracy Class and Rated Burden (VA)
Rated Primary Current	0.2S	0.2	0.5	10P20	10P15	10P10	0.2S	0.2	10P15	10P10
75			Class 3, 1 VA					Class 3, 1 VA
100			Class 3, 2.5 VA					Class 3, 1 VA
150			2.5			2.5		2.5
200		2.5	2.5			5		2.5		5
300	2.5	2.5	5			5		2.5		5
400	5	5	10			5		5		7.5
500	5	10	10			10		10		10
600	5	10	10			10		10		10
800	10	10	10			10		10		10
* This model supports an optional zero-sequence winding.