BQ3B050– SIEMENS 3P50A 240V BOLT ON 10kA BREAKER

Bolt-on breakers (like the BQ3B050) secure to the bus bar with a screw, providing a more rigid mechanical connection, while plug-in breakers clip directly onto the bus. You can identify your panel's type by checking the panel label or the existing breakers — if they have a visible mounting screw on the bus bar side, your panel takes bolt-on breakers. If you're unsure, share your panel model with us and we'll confirm the correct type.

The Siemens BQ series bolt-on breakers can be difficult to source through standard channels as product lines evolve. Northern Breaker Group specializes in hard-to-find and obsolete breakers, so we maintain stock of legacy Siemens bolt-on units like the BQ3B050. Contact us or request a quote and we'll confirm current availability.

The BQ3B050 is rated for 240V and is a 3-pole breaker, making it suitable for protecting 3-wire 240V single-phase loads (such as large motors or sub-panels) as well as 3-phase loads in compatible 240V 3-phase systems. Always verify that your panel and supply voltage match the breaker's ratings. If you need clarification for your specific application, our team is happy to help.