A device for use with an a.c. earth leakage circuit breaker provided for a d.c. load, said device comprising a current balance sensor provided for the phase and neutral lines of the a.c.power source, for sensing the pulsating d.c. earth leakage at the said load; a control unit incorporating a trigger circuit acting as an electronic switch, the trigger circuit being connected to the said sensor, such that the said sensor is capable of sensing the d.c. imbalance created by d.c. earth leakage occurring at the said load and to actuate the trigger circuit to close and create an a.c. imbalance in the said lines so as to trip the circuit breaker. 0 ARULANANDASAMY JOSEPH STEPHEN, 2197/MAS/1998A 2197/MAS/1998 INDIA 2009-03-27T15:57:30Z 2006-10-27 1998-10-01 424268 H 02 H 3/16 18069 0 254 2006-10-27 0 3Pizk0Gn 2009-04-30T22:21:07Z 87040 ARULANANDASAMY JOSEPH STEPHEN