Electrical Panel Known as a distribution board or a breaker box, among other names is an enclosed, steel box that houses your electrical system’s circuit breakers, which are switches that regulate your home’s power supply. Circuits distribute the power provided by your electrical service—usually from a municipal source—throughout your home. Circuit breakers protect your wiring from electrical surges or shorts, effectively shutting off the power supply when tripped. Every electrical panel has an inherent electrical-capacity load to handle specific usage needs. If you increase your home’s load capacity, you will need to add another breaker box to compensate.