Circuit Breakers for Low Voltage Substation Distribution System - Paperbackby Karrar S. Faraj (Author), Ali Maki Khyoun (Author) The Circuit Breaker (C. B) is a device for disconnecting and connecting to the electrical circuit. Its location is between the electrical source and the loads fed from this source, and the mechanical parts move in it, either manually or electrically, to work in turn to separate the electrical current on the center of the loads, regardless of whether they are engines, or lighting circuits, or fed to