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The B140 Siemens (BL) 1P 40A 120V Bolt-On Breaker is designed for reliable performance in residential and commercial applications. With a 10kA interrupting capacity, this high-quality circuit breaker ensures safety and durability. Ideal for circuit protection, it fits seamlessly into your electrical panel, offering peace of mind for your electrical needs.
The BL series uses a bolt-on connection to the bus bar, which provides a more mechanically secure attachment — common in commercial panelboards and certain residential loadcentres. The QP series uses a plug-in connection for faster installation in standard residential panels. These two series are not interchangeable, so it's important to match the breaker type to your specific panel's bus design.
Siemens BL-series bolt-on breakers can be difficult to source through standard supply channels, particularly in specific amp ratings like the 40A. Northern Breaker Group specializes in hard-to-find and obsolete breakers across Canada — contact our Calgary, Edmonton, or Vancouver locations or request a quote online for current stock availability.
No — breakers must match the panel manufacturer and bus type. The Siemens B140 is designed specifically for Siemens/ITE panels that accept BL bolt-on breakers. Installing a breaker in a panel it was not designed for can create unsafe connections and may violate the Canadian Electrical Code (CEC). Always verify the replacement breaker matches your panel's make, series, and bus style.
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