the circuit breaker is used as a protection switch for power supplying a circuit with ac 50/60hz,voltage 220v,current up to 32a.it has inherent overload protection function.combined with a fuse,it can also provide short circuit protection for circuit.besides,it can unfrequently make and break a loaded circuit.it is especially suitable for lighting devices in houses and public places,or a single electric appliance such as refrigeratoretc.