Specially designed for easy installation, Eaton's BR load centers house the branch circuit breakers and the wiring required to distribute power to individual circuits. This panel is a main lug panel which is used as sub-panel to add circuits to an existing main breaker panel. The branch breakers protect the wires leading to individual electrical loads such as fixtures and outlets. The 3BR4242L225 is a 225 Amp 3 phase main lug with 42 spaces and 42 circuits.