Abstract: A power interruption detector including a housing, a power input cord, a multi-volt transformer having a 120-208-240 primary winding and a 24 volt secondary winding, a power contactor with an actuating coil, a power plug receptacle, a delay timer, a counting circuit, an alarm circuit, a thumb-wheel switch, a digital trip counter display driver, a display output device, an audible alarm enunciator, and a battery. The power input cord couples line power to the primary winding of the multi-volt transformer and to one side of the power contactor. The other side of the power contactor is wired to the terminals of the power plug receptacle. The power contactor has contacts that close to complete the circuit between the power input cord and the power plug receptacle when the actuating coil is energized. The secondary winding is coupled to the delay timer. The delay timer has a delay timer output coupled to the actuating coil of the contactor.