{"product_id":"siemens-b340-40a-240v-3-pole-bolt-on-circuit-breaker","title":"Siemens B340 40 Amp 3-Pole Bolt-On Circuit Breaker","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Siemens B340 — a 40A, 240V, 3-pole bolt-on molded case circuit breaker crafted to deliver dependable branch-circuit overcurrent and short-circuit protection in panelboards and load centers. Built for steady, long-term performance, it’s a reliable choice for complex electrical setups where safety and uptime matter.\u003c\/p\u003e \u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e provides a rigid, vibration-resistant connection to the bus, helping maintain consistent electrical contact even in demanding environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection by responding to both overloads and short circuits, reducing nuisance trips and providing predictable performance across temperature variations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM-ready compatibility\u003c\/strong\u003e designed to work with matching Siemens OEM load centers and panelboards, simplifying installation and ensuring coordinated protection strategies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile application\u003c\/strong\u003e suitable for residential, commercial, and light industrial panels where dependable protection is required for branch circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number B340\u003c\/strong\u003e from Siemens, a trusted name in electrical protection equipment.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhy this breaker stands out: the bolt-on design minimizes connection play and vibration, which translates to a more reliable bus connection over time. The thermal-magnetic trip unit provides a clear, consistent response to faults, helping prevent damage to wiring and connected equipment. When your panelboard or load center specifies a bolt-on molded case breaker, the Siemens B340 is engineered to fit and perform as expected, without the guesswork of aftermarket substitutes.\u003c\/p\u003e \u003ch3\u003eUse cases and ideal applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInstalling or upgrading panelboards and load centers that require bolt-on MCCBs\u003c\/li\u003e\n\u003cli\u003eProtecting branch circuits in residential subpanels, commercial electrical rooms, and light industrial installations\u003c\/li\u003e\n\u003cli\u003eReplacing aging or incompatible breakers with a compatible Siemens solution to maintain system protection alignment\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eTechnical snapshot\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAmperage rating: 40 A\u003c\/li\u003e\n\u003cli\u003eVoltage rating: 240 V\u003c\/li\u003e\n\u003cli\u003eNumber of poles: 3\u003c\/li\u003e\n\u003cli\u003eMounting style: Bolt-on\u003c\/li\u003e\n\u003cli\u003eType: Thermal-magnetic molded case circuit breaker\u003c\/li\u003e\n\u003cli\u003eManufacturer: Siemens\u003c\/li\u003e\n\u003cli\u003ePart number: B340\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349754302626,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens-b340-40-a-240-v-3-pole-bolt-on-circuit-breaker-ampstate-959.webp?v=1788721026","url":"https:\/\/www.ampstate.com\/products\/siemens-b340-40a-240v-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}