{"product_id":"siemens-bq3b040-40a-240v-3-pole-bolt-on-circuit-breaker","title":"Siemens BQ3B040 - 40 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eThe Siemens BQ3B040 is a 40A, 240V, 3-pole bolt-on molded case circuit breaker built to shield your electrical system from overcurrent and short circuits. Designed for panelboards and load centers, it delivers dependable protection with a compact, rugged design that holds up in demanding environments.\u003c\/p\u003e \u003ch2\u003eSecure, vibration-resistant mounting\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBolt-on mounting\u003c\/strong\u003e provides a rigid connection to the bus, reducing movement and ensuring steady electrical contact even in panels subject to vibration or equipment start-up shocks.\u003c\/p\u003e \u003ch2\u003eStable protection with a thermal-magnetic trip\u003c\/h2\u003e\n\u003cp\u003eThe integrated \u003cstrong\u003ethermal-magnetic trip unit\u003c\/strong\u003e blends thermal overload sensing with magnetic instantaneous protection. This means predictable tripping under varying temperatures and fast response to short circuits, helping to limit damage and downtime.\u003c\/p\u003e \u003ch2\u003eDesigned for compatibility and versatility\u003c\/h2\u003e\n\u003cp\u003eCompatible with matching OEM load centers and panelboards, the \u003cstrong\u003eBQ3B040\u003c\/strong\u003e 3-pole breaker is suitable for \u003cstrong\u003eresidential, commercial, and light industrial\u003c\/strong\u003e applications. Its 3-pole, 240V configuration supports 3-phase equipment and 240V circuits, enabling streamlined protection in a variety of panel setups.\u003c\/p\u003e \u003ch2\u003eKey specifications\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eManufacturer: Siemens\u003c\/li\u003e \u003cli\u003ePart Number: BQ3B040\u003c\/li\u003e \u003cli\u003eType: Thermal-magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003eAmperage Rating: \u003cstrong\u003e40A\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eVoltage Rating: \u003cstrong\u003e240V\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eNumber of Poles: \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eMounting Style: \u003cstrong\u003eBolt-on\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eApplication: Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eUse cases and practical scenarios\u003c\/h2\u003e\n\u003cp\u003eInstall the Siemens BQ3B040 in panelboards or load centers to protect multi-wire 240V circuits and 3-phase equipment. Typical applications include:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eThree-pole protection for 240V motors and HVAC equipment in commercial settings\u003c\/li\u003e \u003cli\u003eBranch circuit protection for three-phase machines in light industrial spaces\u003c\/li\u003e \u003cli\u003eReplacement breaker in residential or small business panels where secure bolt-on mounting is preferred\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhy choose this breaker over alternatives\u003c\/h2\u003e\n\u003cp\u003eCompared with plug-in designs, the bolt-on BQ3B040 offers superior mechanical security and vibration resistance, reducing the risk of loose contacts over time. The thermal-magnetic trip delivers reliable, repeatable protection across temperatures, helping to prevent nuisance trips or delayed responses that can disrupt operations.\u003c\/p\u003e \u003cp\u003eIn short, the Siemens BQ3B040 is a purpose-built solution for durable, dependable protection of 240V, 40A circuits in panelboards and load centers—ready for residential, commercial, and light industrial environments.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349765148834,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens-bq3b040-40-a-240-v-3-pole-bolt-on-circuit-breaker-ampstate-100.webp?v=1788722265","url":"https:\/\/www.ampstate.com\/products\/siemens-bq3b040-40a-240v-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}