When will the Alt Field circuit breaker pop out?

The alt field circuit breaker is designed to protect the alternator's field winding and the overall electrical system from excessive electrical current, which can occur if the alternator is supplying too much electricity. When the system's output exceeds its rated capacity, the circuit breaker acts as a safety mechanism, cutting off the electrical flow to prevent damage to the alternator and associated components. This function is critical for ensuring the safe operation of the electrical system and maintaining the integrity of flight operations.

The other options do not directly relate to the function of the alt field circuit breaker. Disconnecting the battery or applying ground power can affect the overall electrical system, but they do not specifically trigger the circuit breaker related to alternator overload. Heavy loads may affect system performance, but the breaker is specifically designed to address situations where the alternator itself is generating excessive current.