When the current exceeds 2.2 amps the breaker will trip. When shorted out it will sustain a current of 100 amps for 200uS. This can start with a capacitive load of up to 400uF (not 470uF) and not trip thanks to the 200uS delay provided by the 2.2uF capacitor. The delay time, and to some extent the trigger current are dependent on the transistor’s gain. At a gain of 150 (vs. 100) the trip current is reduced to 2 amps. Also, at 150 gain, the trigger time when shorted is reduced by approximately a third, and therefore is the maximum capacitance of the load that can be tolerated without tripping the breaker.
