{"product_id":"siemens-hed42b040-40a-480v-2-pole-bolt-on-circuit-breaker","title":"Siemens HED42B040 - 40 A, 480 V, 2-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eSiemens HED42B040 is a 40A, 480V, 2-pole bolt-on molded case circuit breaker designed for dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built to deliver consistent protection when it matters, this unit helps keep electrical systems safe and uninterrupted.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e provides a rigid, vibration-resistant bus connection. This design minimizes loosening and ensures reliable electrical continuity in installations subject to vibration or movement.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection performance. The thermal element handles overload conditions with predictable timing, while the magnetic element delivers instantaneous action during high-energy short circuits, helping to quickly clear faults.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible design\u003c\/strong\u003e is built to pair with matching Siemens load centers and panelboards, simplifying selection and installation when upgrading or expanding protection in existing systems.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile application\u003c\/strong\u003e suitable for residential, commercial, and light industrial environments, where reliable branch-circuit protection is essential for safety and uptime.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eOverview: what this breaker does for your electrical system\u003c\/h3\u003e\n\u003cp\u003eAs a bolt-on molded case circuit breaker, the HED42B040 is engineered to protect distribution circuits from overcurrent and short-circuit events. Its 2-pole configuration provides synchronized protection across two conductors, making it ideal for circuits that require simultaneous disconnection. By combining a robust mechanical mounting method with a precise thermal-magnetic trip mechanism, this Siemens breaker offers predictable protection characteristics that electricians trust in panel installations and upgrades.\u003c\/p\u003e \u003ch3\u003eTechnical specifications at a glance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Siemens\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e HED42B040\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Thermal-magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage rating:\u003c\/strong\u003e 40A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage rating:\u003c\/strong\u003e 480V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNumber of poles:\u003c\/strong\u003e 2\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting style:\u003c\/strong\u003e Bolt-on\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWho benefits from the Siemens HED42B040\u003c\/h3\u003e\n\u003cp\u003eAnyone upgrading or expanding panelboards and load centers in residential, commercial, or light industrial settings will appreciate the combination of secure mounting, reliable protection, and OEM-compatible integration. It’s particularly well-suited for circuits that require robust protection in environments where vibration or movement could affect connections, and for projects where a predictable trip response is critical for safety and equipment longevity.\u003c\/p\u003e \u003ch3\u003ePractical tips for installation and use\u003c\/h3\u003e\n\u003cp\u003ePair this 2-pole bolt-on breaker with Siemens-compatible panelboards to ensure optimal fit and performance. When installing, verify the panel’s compatibility with bolt-on molded case breakers and follow electrical code requirements for secure mounting torque and wiring terminations. For future-proofing, consider keeping a compatible spare on hand to minimize downtime in service panels that demand quick, reliable protection on every circuit.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349800276130,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens_breaker_and_panel_0c951ade-77b2-478b-ae2d-6803d4bf4946.png?v=1764157173","url":"https:\/\/www.ampstate.com\/products\/siemens-hed42b040-40a-480v-2-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}