Siemens Q3030 30-Amp Single Pole Tandem 120-Volt Circuit Breaker

Siemens Q3030 is a 30-amp tandem circuit breaker designed for 120-volt circuits in QT-frame load centers. As a single-pole tandem (duplex) device, it occupies one slot but provides two independent 120-V circuits, ideal for freeing panel space in compatible Siemens QT panels. The unit is a plug-in mount type with a 10,000-ampere interrupt rating (10 kAIC), suitable for residential and light commercial applications where short-circuit current levels are within that rating. The Q3030 family includes CTL and non-CTL versions depending on the panel configuration, and this model is listed as QT-type tandem 1-pole 30 A. It supports 120/240 VAC single-phase service, enabling two 120-V branch circuits from a single physical slot. Typical use cases include supplying two small-draw circuits such as lighting and receptacles or split feeds for multi-wire branch circuits, in a Siemens QT panel environment. Mounting is plug-in, and various installations may feature load lug terminal options depending on the exact model. The 30-A rating aligns with standard residential circuits and provides a compact solution for panel-fill management where a tandem is permitted by panel labeling and code requirements.