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One of the VIP 400 fault LEDs flashes slowly but the MV circuit breaker is closed. What is the possible cause of this issue ?

If the VIP trips almost simultaneously with a circuit breaker upstream or downstream (discrimination incorrectly coordinated),
the fault can be eliminated before the VIP trips its circuit breaker.

In this case, when the VIP400 sends its trip pulse to the Mitop trip unit, due to its independent operation,
it is possible that the protection function will see the fault, but the energy available in the VIP400 is not sufficient to trip the Mitop trip unit.

The fault LED lights up although the Mitop trip unit has not tripped the circuit breaker.
 
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