Faulty current circuit for protective circuit breaker - has rectifier bridge producing fault-indicating signal to release auxiliary voltage via rectifier

摘要

The fault-current circuit, for protective circuit-breakers, derives an auxiliary voltage from the mains supply via a rectifier. Two rectifying paths are provided for each line. Four or more rectifying paths (G) belonging to two or more lines form a bridge circuit. The auxiliary voltage (Uh) is obtained from one of the bridges diagonals. A capacitor may also be connected across this diagonal. Linear or non-linear resistors are connected before the rectifiers. These resistors may be integrated with the rectifiers.