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What is working principal of V.C.B., O.C.B., A.C.B & Over load
relay?
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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.
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