Electrical apparatus protection switch

The utility model provides an electrical apparatus protection switch, it includes the casing and fixes air switch, earth-leakage protector, relay and excessive pressure undervoltage protection device in the casing, earth-leakage protector's signal acquisition end connects air switch's output, the armature of relay is connected air protection switch's release, excessive pressure undervoltage protection device includes the under-voltage acquisition circuit of treater and excessive pressure, the under-voltage acquisition circuit's of excessive pressure collection end is connected air switch's output, the treater passes through the drive circuit break-make the coil return circuit of relay. Timely supply interruption when this electrical apparatus protection switch can take place the condition such as short circuit, electric leakage, under-voltage, excessive pressure at the transmission of electricity circuit, its have the design scientific, rational in infrastructure, detect accurate, outage in time and safe and reliable's advantage.