Single phase leakage circuit breaker

The utility model relates to a single phase leakage circuit breaker, which comprises a contact bridge, a switch, a leakage trip coil, a circuit board, a zero-sequence current mutual inductor. A bimetallic strip is arranged between the contact bridge and a lock catch; outside surface of the leakage trip coil is wound with a short circuit detecting coil to form into a double-coil loose core type tripping system structure. One end of an iron core is clamped with the lock catch to realize the overload, short circuit and leakage protection of lines. The utility model has the advantages of small volume, compact structure, high reliability, and is suitable for various installation requirements. When the leakage tripping voltage drops to AC 50V, the single phase leakage circuit breaker can still normally motion to satisfy new requirements of global standard.