PROTECTIVE DEVICE FOR LOW-VOLTAGE AC AND DC SUPPLY LINE Russian patent published in 2011 - IPC H02H3/08 

FIELD: electricity.

SUBSTANCE: protective device for a low-voltage DC or AC supply line comprises a facility of current detection, flowing in one or several conductors of the supply line, and at least one electronic protective facility connected during operation with a switch that has at least one pole inserted along the specified conductor, the detection facility comprises at least one resistor capable of serial electric connection with the specified pole of the switch and provision of passage of current flowing in the specified conductor, and at least one electronic processor circuit, receiving the voltage signal at resistor terminals and sending a current signal passing in the line conductor to the first electronic protective device, the first current sensor, which during operation is connected to a pole of an automatic circuit breaker, the second protective device, which during operation is connected to the first current sensor and is supplied from it, the second current sensor. The low-voltage electric AC or DC system includes the specified protective device. The low-voltage includes a relay made in the form of the specified protective device.

EFFECT: provision of high accuracy in the wide range of current readings.

15 cl, 6 dwg