Siemens BF120 N Ground Fault Interrupter Circuit Breaker

Siemens BF120 N Ground Fault Interrupter Circuit Breaker is a single-pole, 120-volt GFCI breaker rated for 20 amps, built to protect a branch circuit from ground faults in U.S. electrical systems. As a ground-fault interrupter (GFCI) device, it trips when it detects leakage current to ground, delivering Class A protection with a 5 mA trip threshold that helps prevent electric shock on 120 V circuits. This model is designed for use in residential and light commercial panels that require 120 V GFCI protection on standard outlets and other branch circuits, and it is part of Siemens' BF120 family of protective devices. When installed in a compatible Siemens panel, the BF120 N provides rapid disconnection of the load upon ground-fault detection, helping to meet NEC requirements for personnel protection on circuits where receptacles or equipment with a potential for contact with water or conductive surfaces may be present.