Siemens Q29000S01 U Industrial Magnetic Contactor

Siemens Q29000S01 U is a two-pole molded-case circuit breaker (MCCB) rated for 90 A at 120/240 VAC, with a 10 kA short-circuit current rating designed to protect feeders and branch circuits in commercial and industrial power-distribution setups. As part of Siemens' Q-type MCCB family, it provides thermal-magnetic protection to quickly interrupt overloads and faults while fitting compactly in standard distribution panels and motor-control centers. Some distributor listings note a 120 V shunt-trip variant for remote tripping, offering an added safety option for emergency shutdowns, while the standard configuration relies on the built-in trip mechanism for automatic fault isolation. With its 2P design and 120/240 VAC rating, the Q29000S01 U is commonly chosen as a replacement or retrofit for Siemens-based installations requiring reliable protection at a 90 A rating and a 10 kA interrupt capability. Because of its compact, 2-pole design, it helps minimize panel footprint while delivering reliable fault isolation, making it a common choice when upgrading older distribution panels or replacing failing MCCBs in mixed Siemens installations.