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difference between shunt coil and tripping coil
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Answer Posted / andrea vanni
shunt coil is not good for safety purpose use, but only for normal operation (usually to close the brk).
For safety purpose, it is necessary to apply the "fail safe" logic, then an undervoltage release coil shall be used.
usually on MV switchgear we have one closing coil shunt type, and two opening coils undervoltage release operated: one for trip commands, one for normal opening.
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