It is applicable to lines with AC 50Hz, rated voltage up to 400V, and rated current up to 125A. 

When a person gets an electric shock or the grid leakage current exceeds the specified value, the residual current circuit breaker can quickly cut off the fault power supply in a very short time to protect the safety of people and electrical equipment. 

It can also protect the overload or short circuit of lines and motors, and can also be used for infrequent switching of lines and infrequent starting of motors. 

This product complies with GB/T169171 and IEC61009-1.