The protection and management of MV/LV transformers in a rural environment requires specific circuit breakers compatible with significant load differences, thus ensuring full exploitation of the installed power, even in unbalanced operation.These units (4 poles 3 of which are protected) cut off in air with metal partition chambers to break the arc.When the circuit breaker is open, a contact makes an electrical link between the transformer neutral and the station structural earth.When the cir

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