Answer Posted / anjireddy boduggam

VCB - vacuum ckt. Breaker , Quenching medium - Vacuum,
ACB - Air ckt. Breaker , Quenching medium - Air,
OCB - oil ckt. breaker , Quenching medium - Oil
above in all ckt. breakers different quenching medias are
using.
The above all ckt. Breakers principle is same, but medias
are used for arc quenching purpose.

OLR - over load relay , when current exceeds over setting
point, then action will be started and disconnected the
load supply by relay action.No medium is used in the OL
relay, but it works on bi-metallic action.

I HAVE A INCOMING 100A MCCB TPN 25KA, CABLE LENGHT OF 80M 70MM CABLE SIZE FROM MAIN SUBBOARD TO NEW DB.BASE ON THE FAULT LEVEL SETTING OF 45KA.I WOULD LIKE TO FIND OUT 25KA ENOUGH KA. APPRECIATE IF SOMEBODY CAN ASSIST ME WITH FORMULA FOR THIS. FRM: JEFF

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