{"product_id":"siemens-bq3b040-40a-3p-240v-circuit-breaker","title":"Siemens BQ3B040 40A 3P 240V Circuit Breaker, Bolt-On | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eThe Siemens \u003cstrong\u003eBQ3B040\u003c\/strong\u003e is a bolt-on, three-pole circuit breaker built for reliable protection of 240-volt distributions in panelboards, load centers, and electrical distribution systems. Designed for everyday electrical work, this 40-amp unit helps keep your power circuits safe, stable, and compliant with original equipment specifications.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage\u003c\/strong\u003e: 40 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles\u003c\/strong\u003e: 3\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage\u003c\/strong\u003e: 240 V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting\u003c\/strong\u003e: Bolt-On\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer\u003c\/strong\u003e: Siemens\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: BQ3B040\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApplications\u003c\/strong\u003e: panelboards, load centers, electrical distribution\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhy this matters in real-world installations? If you’re upgrading, repairing, or expanding an electrical system, using the exact original part number—BQ3B040—ensures seamless mounting, correct bus bar interaction, and predictable tripping performance. The bolt-on design delivers a secure mechanical connection that’s well-suited for retrofit projects and spare-part stocking, helping you maintain a clean BOM and minimize compatibility surprises when you’re cycling through replacements.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eKey use cases\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eReplacement projects where the panel originally specified a 3P 240V, 40A bolt-on breaker\u003c\/li\u003e \u003cli\u003eStocking spares to keep the BOM aligned with the original Siemens part number\u003c\/li\u003e \u003cli\u003eRetrofits in commercial or industrial panelboards and distribution centers\u003c\/li\u003e \u003cli\u003eMaintenance inventories for service calls that require exact-fit replacements\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eWhat makes the BQ3B040 stand out\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eDirect alignment with Siemens panelboard and load-center configurations that expect a bolt-on 3-pole, 240V device\u003c\/li\u003e \u003cli\u003eConsistency in electrical protection characteristics, reducing the risk of mismatched trip curves or mounting issues\u003c\/li\u003e \u003cli\u003eEasy integration into existing assemblies where the original part number is preserved for BOM accuracy\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eIf you’re unsure about fit or compatibility, we can help. \u003cem\u003eNeed help matching a part number or confirming compatibility?\u003c\/em\u003e Message us and we’ll help you confirm fit.\u003c\/p\u003e \u003cp\u003eDesigned for professionals who demand dependable circuit protection with straightforward installation, the Siemens BQ3B040 delivers solid performance when you’re managing panelboard protection, distribution reliability, and spare-part readiness. Add it to your procurement list for a precise, reliable upgrade or replacement that stays true to the original specifications.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"AmpState","offers":[{"title":"Default Title","offer_id":46410989797538,"sku":"BQ3B040","price":476.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_83963f7f-600e-419f-90c6-e7677089642b.png?v=1765492973","url":"https:\/\/www.ampstate.com\/products\/siemens-bq3b040-40a-3p-240v-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}