MidNite Solar's Remote Trip (RT) circuit breakers require a voltage pulse of approximately 1/10th of a second. Much longer than that time and the coil will burn out. In other words, you can apply continuous power to the breaker, however, you can only apply a pulse to its coil. When purchasing an RT breaker, MidNite Solar recommends that you also purchase the:
MidNite Solar MNBDM Rapid Shutdown System
MidNite Solar MNBIRDHOUSE Emergency Disconnect Switch in Gray or Red
These 3 components work together to provide remote trip with visual and audible trip verification.