Siemens QF120N Miniature Circuit Breaker

The Siemens QF120N Miniature Circuit Breaker is a single-pole, 20-amp, 120-volt protective device intended to safeguard individual branch circuits in residential and light commercial electrical panels by interrupting excessive current that could overheat conductors. As part of Siemens' QF line of molded-case circuit breakers, the QF120N provides automatic overcurrent protection for circuits feeding lighting, receptacles, and other 120-volt branch circuits, helping to prevent damage and reduce electrical hazards in everyday installations. The 1-pole configuration supports residential 120-volt service, and this unit is designed for use in compatible Siemens load centers and distribution boards, where straightforward replacement and compatibility with existing breakers streamline upgrades or panel upgrades. With a 120-volt, 20-amp rating, the QF120N is a compact solution that occupies a single space in standard enclosures and integrates with standard wiring practices for safe, reliable circuit protection across common household applications.