What is the Difference Between MCCB & ACB & VCB
Answer Posted / sendô
VCBs are used primarily for medium voltage circuits (11kV
in UK), due to their better arc quenching abilities (these
high voltages in ACBs or MCCBs would cause an arc between
the terminals and render the breaker useless).
The fundamental differences between ACBs and MCCBs are.
1. MCCBs cost far less than ACBs
2. MCCBs are better at lower interrupt currents (below
630/800A), ACBs are better at higher currents (800A and
above)
3. ACBs are a lot bigger and take up large sections of
panel that you might be able to fit 3 or 4 smaller MCCBs
into.
4. The main advantage is ACBs perform better under high
current short circuits, and will normally withstand for
long enough to allow a downstream device to open and clear
the fault, thus localising the short circuit trip.
5. ACBs are more easily serviced (particularly withdrawable
type).
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