Siemens NSB Q3030NC Miniature Circuit Breaker

Siemens Q3030NC QT-type duplex miniature circuit breaker is a non-current-limiting tandem device rated for 30/30 A at 120/240 VAC, designed to protect two independent circuits in a single housing. It carries a 10 kA interrupt rating and uses a thermal/magnetic trip mechanism to provide fast, reliable overcurrent protection. As a duplex (tandem) unit within the QT family, it enables an additional 30-A circuit in panel slots where twin single-pole breakers are required, making efficient use of space in residential distribution panels. This model is widely listed for residential applications and is available under catalog number Q3030NC, reflecting Siemens' low-voltage line of mini circuit breakers.