Should a downstream CB fail, a trip can be issued by the CB failure protection function. In this case the dedicated general interrogation is checked as a condition so as to guarantee increased security against overreaction.

The signal CBF_1: Starting will be issued when the signal CBF_1: Starting trig. EXT is presented to an appropriately configured binary signal input and a general starting is present. The signal CBF_1: Trip signal will be issued after timer stage CBF_1: Delay/starting trig. has elapsed.