What is the difference between MPCB and OLR?
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Answer Posted / sachin
MPCB is device which has inbuilt OLR+Short circuit
connected to Trip coil.
In event of fault like oveload OLR coil will sense and give
command to trip coil to trip.
In event of Short circuit fault SC coil will energise
inside MPCB and trip circuit breaker.
In case of OLR over load relay, its only a primary device
which senses only over loads.We need to connect contactor
to break the circuit.
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