The Circular Residual Current Transformer (RCT) from Jiangyin Lingzhi Electric Co., Ltd. is specifically designed for cable circuit environments. It features a simple structure, compact size, and flexible application, providing precise residual current measurement and reliable electrical protection in industrial, commercial, and smart power systems. Unlike conventional CTs, this series combines high magnetic conductivity core materials with an advanced circular core design to ensure stability and safety.

Electrical Performance and Technical Specifications

To meet diverse monitoring and protection requirements, the Circular RCT offers:

Through-core diameter: 25mm ~ 200mm 

Main circuit current range: 63A ~ 2000A 

Accuracy: Class 0.2, 0.5, 1 

Residual current output: Optimized for 30mA, 10mA, 5mA, or 3mA 

Working frequency: 50–400Hz 

Core materials: High magnetic conductivity nickel steel or nanocrystalline 

Shell material: ABS, flame retardant grade 94-V0 

Internal structure: Environment-friendly epoxy resin casting 

Connection: Terminal type with shielded strand 1.5m 

These specifications ensure excellent linearity, high sensitivity, and strong anti-electromagnetic interference ability, providing reliable protection for equipment. The product meets the requirements of GB 14287.2-2005 and GB 14287.2-2014 standards.

Key Applications

The Circular Residual Current Transformer is ideal for:

• Electrical fire monitoring and leakage protection systems 
• Intelligent power systems 
• Low-current grounding systems 
• Electromagnetic relay protection 
• Microcomputer protection 
• Environmental monitoring 

It is particularly suitable for projects requiring high reliability, precise measurement, and strict residual current balance.

Structural and Installation Advantages

Through-Core Structure
The circular core design allows installation without disconnecting existing wiring, reducing operational downtime and simplifying maintenance.

Durable Materials and Stability
Flame-retardant epoxy resin and high-permeability core materials provide long-term durability, accurate measurement, and strong resistance to interference.

Flexible Measurement Range
Supporting 63A to 2000A, one RCT model can accommodate multiple system configurations from small circuits to main power lines.

Compact and Secure Installation
ABS shell and PBT skeleton offer mechanical stability, while screw fixation ensures secure mounting in electrical panels and enclosures.

Installation & Maintenance

• Open the circular core and thread the conductor through the transformer window. 
• Secure the transformer using the screw fixation points. 
• Connect the secondary output to the monitoring or protection device. 

Routine maintenance is minimal, typically limited to inspection of connections and fastening integrity.

Explore Circular Residual Current Transformer solutions from Jiangyin Lingzhi Electric for high-precision, retrofit-friendly electrical protection applications. Contact us for detailed specifications, installation guidance, or customization support.