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ABB YPG110E 100% brand new

For the MRI3-overcurrent relays with directional feature different time delays or time multipliers can be set for forward and backward faults (ref. to chapter 5.4.3). If the trip delay for backward faults is set longer than the one for forward faults, the protective relay works as a "backup"-relay for the other lines on the same busbar. This means that the relay can clear a fault in the backward direction with a longer time delay in case of refusal of the relay or the circuit breaker on the faulted line

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