Does a shunt trip breaker trip with loss of control power?

Yes, a shunt trip breaker will trip if there is a loss of control power. The shunt trip mechanism requires power to function, and without it, the breaker cannot receive the signal to trip. However, in the event of a fault or overload condition, the breaker will still trip due to its internal protective mechanisms. It's essential to ensure that control power is maintained for proper operation of the shunt trip feature.