ATPL: On detection of a persistent phase unbalance on an AC generator connected to the aircraft mains, with another AC generator, the protection device opens:
Question 461, Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license
The tie breaker.
The exciter control relay and the generator breaker.
Explanation: On detection of a persistent phase unbalance on an AC generator connected to the aircraft mains, with another AC generator, the protection device opens: