What is working principal of V.C.B., O.C.B., A.C.B & Over load
relay?
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Answer Posted / zubair
ACB MEAMS AIR CIRCUIT BREAKER.
VCB MEANS VACCUM CIRCUIT BREAKER.
OCB MEANS OIL CIRCUIT BREAKER.
ALL THE ABOVE USED TO TRIP THE CIRCUIT,WHEN EVER THEIR IS A
FAULT AT THE LOAD SIDE, like short circuit,excess current
consumption beyond the rated value
THE DIELECTRIC STRENGTH OF VCB IS HEIGHER THAN ACB.THE ARC
EXTINGUISHER CAPACITY OF VCB IS HEIGHER THAN ACB.HENCE VCB
IS USED FOR HIEGHER VOLTAGES AND RATINGS.
THE OLR(OVER LOAD RELAY)IS ALSO USED TO TRIP THE
CIRCUIT ,WHEN EVER THE LOAD TAKES HIGER CURRENT BEYOUND
RATED VALUE, BUT THE APPLICATION IS LIMITED TO 20A.
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