Incessant power supply unit of power plant's auxiliary engine control box

The utility model discloses an incessant power supply unit of power plant's auxiliary engine control box, including the UPS unit, the interchange inlet wire end of UPS unit connects in parallel and has first inlet wire return circuit of power and power second inlet wire return circuit, be provided with on first inlet wire return circuit of power and the power second inlet wire return circuit respectively by first inlet wire contactor KM1 and second inlet wire contactor KM2 form from the lock -switch, be provided with active -standby switch switch and interlock switch between first inlet wire return circuit of power and the power second inlet wire return circuit, two normally open contact of connector contact ware KM3 are distinguished to the inlet wire of UPS unit end and leading -out terminal, are connected with outgoing inspection contactor KM3's coil at the leading -out terminal of UPS unit, normal close owner's contact both ends of outgoing inspection contactor KM3 are connected respectively in the interc