{"product_id":"siemens-hjxd63b400h-400a-600v-3-pole-bolt-on-circuit-breaker","title":"Siemens HJXD63B400H - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003eSiemens HJXD63B400H is a 400A, 600V, 3-pole bolt-on molded case circuit breaker engineered to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. With a secure bolt-on mounting and a thermal-magnetic trip unit, this device provides stable, repeatable protection in demanding environments—from residential distribution to commercial and light industrial applications. \u003ch3\u003eWhat sets this breaker apart\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e for a rigid, vibration-resistant bus connection that stays aligned under dynamic conditions—reducing the risk of loose connections and nuisance trips.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e combines time-delayed thermal protection with instantaneous magnetic trip for reliable response to both overloads and short circuits.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM panel compatibility\u003c\/strong\u003e designed to pair with matching Siemens OEM loadcenters and panelboards, ensuring seamless fit and consistent performance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHigh-current, high-voltage capability\u003c\/strong\u003e suited for large circuits in residential, commercial, and light industrial settings—400A at 600V protects substantial feeder and distribution circuits.\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 HJXD63B400H\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 400A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage Rating:\u003c\/strong\u003e 600V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 3\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 in panelboards\/load centers\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eIdeal applications and use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eProtection for large feeder circuits in residential service panels or multi-breaker distribution boards where 3-phase loads require solid overcurrent protection.\u003c\/li\u003e \u003cli\u003eMain or sub-feed protection in commercial panelboards handling significant equipment, HVAC, or lighting loads.\u003c\/li\u003e \u003cli\u003eReliable protection for light industrial circuits that demand robust, vibration-resistant connections and precise interruption of fault currents.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy choose this Siemens breaker over alternatives\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eThe bolt-on design delivers a sturdier, vibration-resilient connection, reducing maintenance concerns in installations subject to movement or mechanical stress.\u003c\/li\u003e \u003cli\u003eThe thermal-magnetic trip unit provides predictable, repeatable protection curves across temperature ranges, helping prevent nuisance trips while guarding against sustained faults.\u003c\/li\u003e \u003cli\u003eDesigned to integrate with Siemens OEM load centers and panelboards, offering cohesive performance, documented compatibility, and simpler replacement decisions.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eInstallation and practical considerations\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eBefore installation, verify the breaker’s compatibility with the specific Siemens panelboard or load center model in use to ensure correct bus routing and mounting alignment.\u003c\/li\u003e \u003cli\u003eFollow manufacturer torque specs for bolt-on mounting to maintain a solid electrical and mechanical connection and to preserve the integrity of the bus bar interface.\u003c\/li\u003e \u003cli\u003eUse this 3-pole breaker for branch circuit protection where a 400A maximum device is appropriate, and ensure conductors and overcurrent protection devices upstream are sized accordingly.\u003c\/li\u003e \u003cli\u003eConsider this unit for upgrading existing high-current circuits that require a reliable, heavy-duty bolt-on solution with clear, repeatable trip behavior.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWith the Siemens HJXD63B400H, you’re choosing a high-capacity, dependable protective device designed to keep large, essential circuits safe in the real world—from home autos and workshops to busy commercial spaces. Its combination of secure mounting, precise thermal-magnetic protection, and OEM-friendly compatibility makes it a practical, future-ready choice for robust electrical panel protection.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349810204834,"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_e73360b5-e82b-4d0b-9384-ae1525642be4.png?v=1764157467","url":"https:\/\/www.ampstate.com\/products\/siemens-hjxd63b400h-400a-600v-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}