OVERCURRENT PROTECTION DEVICE WITH UNDERVOLTAGE BLOCKING Russian patent published in 2022 - IPC H02H3/08 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering. The overcurrent protection device with undervoltage blocking contains the first, second and third inductors, a time relay with a winding and a contact with a time delay for closing, an undervoltage relay, the first and second intermediate relays, an indicator relay. The first and second voltage amplifiers are introduced into the device, increasing the voltage coming from the first and second inductors, connected to the winding of the first intermediate relay, which sends a positive potential to the second intermediate relay connected to the contact with a time delay for closing the time relay. The positive potential of the DC source with the time relay is supplied to the indicator relay connected to the first output of the trip coil of the electrical installation switch and to the minimum voltage relay.

EFFECT: simplification of technical implementation while ensuring reliable current protection.

1 cl, 2 dwg