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Answer Posted / angana majumder
we know circuit breakers are used for mainly for switching
and current interrupting device.this particular cb uses the
gas sulphur hexafluride gas as for arc quenching formed
during short circuit.thus the current is interupted without
the risk or fire.
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Is a contactor (or master relay) required between incoming lines and a VFD? The question goes to safety. If a contactor were used before the VFD and an e-stop engaged then the motor will coast to a stop (i.e. VFD loses power) instead of stopping much faster if the VFD braking fucntion were used. It would make more sense to keep power on the VFD.
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