{"product_id":"siemens-hed42b045-45a-480v-2-pole-bolt-on-circuit-breaker","title":"Siemens HED42B045 - 45 A, 480 V, 2-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eSiemens HED42B045\u003c\/strong\u003e is a 45A, 480V, 2-pole bolt-on molded case circuit breaker engineered for dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. This unit brings robust reliability to commercial, light industrial, and certain residential applications where 480V distribution is standard.\u003c\/p\u003e \u003ch2\u003eWhy this bolt-on breaker stands out\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e delivers a rigid, vibration-resistant bus connection. In environments with equipment vibration or temperature cycling, this design maintains consistent electrical contact and reduces the risk of loose connections over time.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e provides stable, repeatable protection. The thermal element guards against nuisance overloads, while the magnetic element delivers a fast, decisive response to short circuits, helping minimize equipment damage.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e2-pole design\u003c\/strong\u003e ensures simultaneous disconnection of both hot legs, delivering coordinated protection for 2‑pole circuits and multi-wire branch circuits common in higher‑voltage panel installations.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM compatibility\u003c\/strong\u003e is crafted for seamless integration with matching Siemens OEM load centers and panelboards, simplifying replacements, upgrades, and maintenance schedules.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile application\u003c\/strong\u003e suited for residential, commercial, and light industrial electrical distribution where reliable 480V protection is required.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eKey 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 HED42B045\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 45A\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\u003eIdeal use scenarios\u003c\/h3\u003e\n\u003cp\u003eIn commercial electrical rooms or industrial control panels where 480V distribution is standard, the Siemens HED42B045 serves as a dependable line‑side protection device for feeders and critical branch circuits. It’s an excellent choice for:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003ePanelboards and load centers that require rugged, vibration‑resistant switching and reliable trip behavior\u003c\/li\u003e \u003cli\u003eMid‑to‑large commercial installations with frequent motor loads and lighting circuits\u003c\/li\u003e \u003cli\u003eLight industrial panels where 2‑pole protection ensures coordinated disconnection of both conductors\u003c\/li\u003e \u003cli\u003eRetrofits or replacements in Siemens‑equipped systems that demand exact compatibility and performance\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003ePractical considerations and tips\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eVerify panelboard compatibility before installation to ensure the bolt‑on connection and trip characteristics align with existing equipment.\u003c\/li\u003e \u003cli\u003eOpt for this unit when you need strong vibration resistance and repeatable protection across varying environmental conditions.\u003c\/li\u003e \u003cli\u003eConsider the load profile and fault current of your system to capitalize on the thermal and magnetic trip features—this helps avoid nuisance trips while still delivering prompt protection during faults.\u003c\/li\u003e \u003cli\u003eFor installers and facilities teams, this breaker pairs well with Siemens‑supplied load centers for streamlined maintenance and reliable long‑term operation.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eDesigned for professionals who demand durability, precise protection, and OEM‑grade compatibility, the Siemens HED42B045 delivers consistent performance across a range of 480V circuits. Add it to your electrical distribution lineup through AmpState for a dependable, industry‑standard solution that protects people, equipment, and productivity.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349800374434,"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_6947edec-6af0-4944-b744-6ecaaf7cce1a.png?v=1764157177","url":"https:\/\/www.ampstate.com\/products\/siemens-hed42b045-45a-480v-2-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}