Federal Pacific Electric NB370U Circuit Breaker

The Federal Pacific Electric NB370U circuit breaker is a 70 amp, three-pole (3P), 240-volt protection device designed to interrupt excessive current in three-phase electrical circuits. As part of Federal Pacific Electric's NB-series family, the NB370U is intended for use in panels and distribution systems that require a 70A, 3P, 240V breaker to protect feeders and motors from overloads and short circuits. With three-pole operation, all conductors disconnect simultaneously to isolate faults and prevent backfeed on the other phases. This rating makes it suitable for medium-current loads commonly found in commercial or light industrial applications that run on 240V three-phase power. Installers should ensure the panel is labeled for NB-series breakers and that the installation complies with local electrical codes and the panel manufacturer's instructions to provide proper overcurrent protection for connected loads.