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The B340 SIEMENS (BL) 3P 40A 240V Bolt On Breaker is designed for reliability and performance, providing 10kA of short-circuit protection. Ideal for commercial and residential applications, this breaker ensures a safe and efficient electrical system. Durably constructed for long-lasting use, it’s a must-have for any electrical panel upgrade.
No, they cannot be interchanged. The BL series (e.g., B340) uses a bolt-on mounting where the breaker is physically bolted to the bus bar, providing a more secure mechanical and electrical connection. QP series breakers use a plug-in clip design. Each style requires a panelboard specifically designed for that mounting type, so it's important to match the breaker series to your panel before purchasing.
The Siemens BL bolt-on series has largely been superseded in newer panel designs, making some configurations harder to source through standard supply channels. Northern Breaker Group specialises in exactly these hard-to-find and obsolete breakers — the B340 is available from our inventory. Contact us or visit one of our Calgary, Edmonton, or Vancouver counters for current stock.
Yes — as a 3-pole, 240 V breaker, the B340 is suited for three-phase 240 V systems in commercial and light industrial panelboards. The 10 kA interrupting rating meets the short-circuit current requirements for many Canadian installations; however, you should verify the available fault current (AFC) at the point of installation with your electrician or engineer to ensure the panel's and breaker's ratings are not exceeded, as required by the Canadian Electrical Code (CEC).
