{"product_id":"siemens-hed42b125-125a-480v-2-pole-bolt-on-circuit-breaker","title":"Siemens HED42B125 - 125 A, 480 V, 2-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eSiemens HED42B125\u003c\/strong\u003e is a robust \u003cem\u003e125 A, 480 V\u003c\/em\u003e two-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection for panelboards and loadcenters. Built for professional electrical installations, it combines secure mounting, precise protection, and compatibility with Siemens OEM panels to meet the demands of commercial and light industrial environments—and even certain higher-demand residential applications.\u003c\/p\u003e \u003ch3\u003eWhy this breaker stands out\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e provides a rigid, vibration-resistant bus connection. That means fewer loosening issues in environments with machinery, doors, or frequent activity, and a more reliable long-term connection.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection performance. It reacts quickly to short circuits and adapts to normal load variations, helping prevent nuisance trips while still guarding equipment.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM panel compatibility\u003c\/strong\u003e designed for use with matching Siemens panels and other OEM panelboards, ensuring straightforward installation and reliable fitment in your distribution system.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile 2-pole design for 480 V systems\u003c\/strong\u003e ideal for disconnecting both hot legs on 480 V circuits, boosting safety and simplifying wiring layouts in commercial and light industrial applications.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eTechnical snapshot\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 HED42B125\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 125 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage rating:\u003c\/strong\u003e 480 V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\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 for and use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eNew installations and panelboard retrofit projects in commercial facilities, light industrial equipment rooms, and data-center distribution hubs that operate at 480 V.\u003c\/li\u003e \u003cli\u003eRepairs or replacements in existing Siemens panelboards and matched OEM panels where a secure bolt-on solution is preferred over snap-in alternatives.\u003c\/li\u003e \u003cli\u003eProtection for critical branch circuits where reliable, repeatable trip characteristics minimize downtime and protect downstream equipment from damage.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003ePractical considerations and setup tips\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eEnsure the panelboard or loadcenter is compatible with the HED series and that the bolt-on mounting method is appropriate for your enclosure and bus connection.\u003c\/li\u003e \u003cli\u003ePrepare for secure installation by following manufacturer installation guidelines and tightening torque specifications for bolt-on devices to maintain a solid connection.\u003c\/li\u003e \u003cli\u003eUse this breaker as part of a coordinated protection strategy for 480 V distribution networks, pairing it with correctly rated conductors, protective devices, and upstream protection to optimize safety and reliability.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eDesigned for professionals who demand dependable, long-lasting performance in demanding electrical distribution environments, the Siemens HED42B125 125 A, 480 V, 2-pole bolt-on molded case circuit breaker provides decisive protection, solid mounting, and seamless compatibility with Siemens panel systems. It’s the practical choice when you need precise overcurrent and short-circuit protection that you can trust in panelboards and loadcenters across residential, commercial, and light industrial settings.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349801160866,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens-hed42b125-125-a-480-v-2-pole-bolt-on-circuit-breaker-483.webp?v=1788729831","url":"https:\/\/www.ampstate.com\/products\/siemens-hed42b125-125a-480v-2-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}