This product is a residual current operated circuit breaker derived from UKM30 series molded case circuit breakers of our company. The product has perfect protection function, reliable performance, high technical indicators, complete accessories, beautiful appearance, small volume, and the same shell frame UKM30L and UKM30 have identical overall dimensions and installation dimensions.

The circuit breaker is applicable to the power system with AC 50Hz, rated voltage up to 400V and rated current up to 400A. It is used to distribute electric energy and protect the power system from overload, short circuit, leakage and other faults. It can also be used to control infrequent motor operation.

The leakage (residual current) protection function of the circuit breaker is to provide indirect contact protection for people with fatal danger of electric shock, and also to prevent electrical fire caused by long-term grounding fault current that cannot be detected by the overcurrent protection device. 

The residual action current rating of the circuit breaker can be adjusted, and the action time of the leakage protection can also be adjusted. Therefore, it can realize the selective protection of leakage in the power distribution system. When the rated residual action current is set to 30mA, the circuit breaker can also be used as a protection device for direct contact when the relevant protection device fails.