Power switching circuit

The utility model discloses a power supply switching circuit, which comprises a main power supply, a standby power supply and a switching circuit, and is characterized in that the main power supply and the standby power supply are both connected with a fuse and a leakage protector of a protection circuit, and the leakage protector is connected with a contactor. The contactor is used for automatically switching between a main power supply and a standby power supply and interlocking the main power supply and the standby power supply; the conversion circuit is connected with the main power supply and the standby power supply; compared with a complete set of stand-by power supply equipment, the stand-by power supply equipment is low in cost, low in maintenance cost, low in maintenance technical requirement, convenient to inspect and clear at a glance; automatic switching and interlocking are carried out through the two contactors, isolation can be carried out through the contactors, and automatic switching of the