Siemens QF120 Molded-Case Circuit Breaker

Siemens QF120 Molded-Case Circuit Breaker is a 1‑pole, 120‑volt AC protective device rated at 20 A, intended for use in Siemens load centers that accept QF family breakers. It provides thermal‑magnetic overcurrent protection with a 10 kA interrupting rating, enabling fast clearing of overloads or faults on a single branch circuit. The molded‑case construction and plug‑in mounting are designed for straightforward installation in compatible Siemens panels, delivering reliable protection in residential or light commercial electrical distributions. As part of the QF line, this breaker is the standard non‑GFCI variant; Siemens also offers a QF120A variant, a 1‑pole 120‑V GFCI version (UL Type QPF2) for circuits requiring ground‑fault protection. The QF120 is UL listed for 120 VAC operation and is marketed as a genuine OEM Siemens component, suitable for replacement in qualifying Siemens panelboards and load centers that specify QF‑series breakers.