EATON circuit breaker, type bd, twin, 120 vac, 20/30 a, 1 phase, 50a frame, 10 ka interrupt, 1 poles, thermal magnetic actuator, 14 - 4 AWG wire, plug on mounting, 3.1 in overall length, 0.98 in overall width, 2.89 in overall depth, ansi specified, CSA certified, UL listed, for overload and short circuit protection of home electrical system. This product requires 1 inch per breaker, and has a rejection tab feature. It is interchangeable as well. It is convenient and works effectively. It is definitely a great quality product.