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ABB 88FN02B-E GJR2370800R0200 with factory sealed box
The CB failure protection is based on supervision of phase currents during tripping events. Only after
tripping this protective function becomes active. The test criterion is whether all phase currents
are dropped to <1% x IN within tCBFP (Circuit Breaker Failure Protection - adjustable between 0.1 -
2.0 s). If not all of the phase currents have dropped to <1%xIN within this time, CB failure is detected
and the related relay activated. The CB failure protection function is deactivated again as
soon as the phase currents have dropped to <1% x IN within tCBFP
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