A circuit breaker comprises a latching plate rotatably coupled to a moveable plate, and tensile type latching springs, each latching spring having two ends fixed to the latching plate and the moveable plate, respectively. In one embodiment a method of forming a thin film multi-junction solar cell over a substrate is provided. The invention takes advantage of the fact that the scheduling assist can be dedicated exclusively to scanning tables in its own dedicated memories looking for events that have expired andor output channels that are available and not involve the processor in the search for output channels that are available and ready to be serviced. An electric motor drives the pump. A pre-installation component, a component assembly and a method is also claimed.