Siemens Q120H U 20A 120V 1P Q-Line Circuit Breaker

Siemens Q120H U is a 1-pole Q-Line circuit breaker designed for 120 V systems, delivering 20 A of overcurrent protection for individual circuits in Siemens load centers. This plug-in breaker uses a thermal-magnetic trip and is designed for use in compatible Siemens Q-Line panels, including legacy ITE/Siemens panels that accept Q-Line devices. It carries a 22 kA interrupt rating at 120 V, enabling it to interrupt faults quickly in typical residential branch circuits. The Q120H U is a single-pole device that mounts by plugging into the Siemens bus connection, and its QPH family designation distinguishes it within the Q-Line line. Common applications include protecting lighting circuits, general receptacle outlets, and small-appliance branch circuits in homes and light commercial installations requiring 120 V and 20 A protection. When selecting a replacement, ensure the panel specifies Type QP/Q-Line breakers and that the device is the 20 A, 1P variant; Siemens and distributors catalog the Q120H family as 20 A, 1P, 120 V with a 22 kA interrupt rating, ensuring coordinated protection with other Siemens Q-Line devices.