Siemens Q3030 Tandem Circuit Breaker 120-Volt

Siemens Q3030 QT tandem circuit breaker delivers two 30A circuits in a single 1-space, plug-on unit for 120/240V AC service. As a Type QT duplex breaker, it occupies one slot in a compatible panel yet provides two independent 120V branches, effectively doubling circuit capacity where space is tight. The unit is rated for 120/240V AC at 60 Hz and carries a 10 kA interrupt rating (10,000 AIC), suitable for typical residential and light commercial branch circuits. The Q3030 is UL-listed and designed for use in Siemens QT panels and other load centers that list tandem QT breakers as acceptable; always consult panel labeling to confirm CTL allowances and compatibility before installation. Applications include adding separate lighting or receptacle circuits in crowded panels, running two small-draw circuits from a single slot, or replacing a single-pole with a tandem to free spaces for new wiring. The 30A rating protects branch circuits against overcurrent while maintaining compact panel layouts in retrofits or new builds that require additional 120V circuits without expanding the panel footprint.