Siemens QB120 Molded Case Circuit Breaker 1 Pole

Siemens Q120 1-pole molded case circuit breaker provides dependable protection for 120V branch circuits in residential and light commercial panels. With a 20 A rating and a 10,000 AIC, it protects against both overloads and short circuits, tripping via its thermal-magnetic mechanism. This Type QP/MP breaker in the Siemens Q-series uses a plug-in connection for quick installation and removal, and some stock configurations offer Insta Wire terminations for faster wiring. Designed for single-pole, 120 VAC circuits, it fits standard 120V panelboards and is commonly used to guard lighting and receptacle circuits, small appliances, or subpanel feeder lines. Its compact molded case construction minimizes panel footprint while delivering robust protection, making it a straightforward replacement option when a 20A, 1-pole device is required in a Siemens panel.