BQ3B040HH– SIEMENS (HBQ) 3P40A 240V BOLT ON 65kA BREAKER

The BQ3B040HH belongs to the HBQ (BQ bolt-on) series, which physically bolts into the busbar rather than using a plug-on connection. It also carries a significantly higher 65kA interrupting rating compared to the typical 10–22kA ratings found on residential QP-series breakers, making it better suited to commercial or industrial panel applications with higher available fault current.

In many cases, yes — provided the replacement breaker matches the original in pole count (3P), voltage (240V), amperage (40A), and bolt-on frame type, and the panel's busbar accepts the BQ series. However, always verify the panel's interrupting-capacity requirement and busbar compatibility before substituting. Contact our team with your panel model and existing breaker part number and we'll help confirm a direct replacement.

Siemens HBQ-series bolt-on breakers can be difficult to source through general electrical distributors. Northern Breaker Group specializes in obsolete and hard-to-find breakers, and we maintain inventory of Siemens bolt-on frames across multiple ampere ratings. Reach out to our Calgary, Edmonton, or Vancouver counters — or request a quote online — and we'll check current stock or source it for you.