Applicable Range

The RMM1LE series residual current circuit breakers (hereinafter referred to as circuit breakers) are suitable for AC 50/60 Hz power systems with a rated working voltage up to 400V and a rated working current from 16A to 630A. They are used for leakage protection in systems where the power neutral point is directly grounded. They can also prevent fire hazards caused by grounding fault currents due to equipment insulation damage. Additionally, they can be used to distribute electrical energy and protect wiring and power equipment from damage due to overloads, short circuits, and other faults. They can also serve as infrequent start-up and overload/short circuit protection for motors.

This residual current circuit breaker features a compact size (equal to that of the corresponding plastic case circuit breaker), high breaking capacity, short arc, and adjustable residual trip current. It also comes with accessories such as alarm contacts, trip coils, and auxiliary contacts, making it an ideal product for user applications. The RCD can be vertically installed (vertical mounting) or horizontally installed (horizontal mounting).

This product complies with GB14048.2 and IEC60947-2 standards.

Structure and Working Principle

·This series of residual current circuit breakers is an electronic type, primarily composed of a zero-sequence transformer, an electronic control leakage trip coil, and a circuit breaker with overload and short-circuit protection. All components are mounted within a plastic housing.

·In the event of leakage or electric shock to the protected circuit, once the residual current reaches the set action current value, the output signal of the secondary winding of the zero-sequence transformer triggers the thyristor to conduct, and the leakage circuit breaker operates through the leakage release, thereby cutting off the power supply to provide leakage and electric shock protection.

·When the protected circuit experiences an overload or a short circuit, the dual release mechanism performs a time-delayed or instantaneous release action, causing the leakage circuit breaker to operate and thereby cutting off the power to provide overload or short-circuit protection.