{"product_id":"siemens-jxd63s400a-400a-600v-3-pole-bolt-on-circuit-breaker","title":"Siemens JXD63S400 A - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eThe Siemens JXD63S400A is a 400A, 600V, 3-pole bolt-on molded case circuit breaker engineered for dependable protection in panelboards and loadcenters. Built for demanding electrical environments, it delivers precise branch circuit overcurrent and short-circuit protection with a robust, vibration-resistant connection.\u003c\/p\u003e \u003cp\u003eKey features designed to outperform everyday breakers include a secure bolt-on mounting that creates a rigid bus connection, minimizing movement and arcing in dynamic electrical installations. The thermal-magnetic trip unit provides stable, repeatable protection by responding to both overload conditions (thermal) and short-circuit events (magnetic), helping to prevent nuisance trips and equipment damage under real-world load fluctuations.\u003c\/p\u003e \u003ch2\u003eWhy this breaker stands out\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e ensures a rigid, vibration-resistant bus connection for long-term reliability in panels and loadcenters.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic protection\u003c\/strong\u003e delivers dependable response to both overloads and short circuits, maintaining consistent performance across temperature changes and electrical noise.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e3-pole design\u003c\/strong\u003e ideal for three-phase systems, providing balanced protection in commercial and light industrial settings.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e400A, 600V rating\u003c\/strong\u003e suits heavy feeders and main-lault protection requirements without compromising trip characteristics.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM compatibility\u003c\/strong\u003e designed to align with matching Siemens OEM loadcenters and panelboards for a seamless, interchangeable fit.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile applications\u003c\/strong\u003e suitable for residential, commercial, and light industrial distribution where reliable branch-circuit protection is essential.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eApplications and use cases\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eProtect large feeders and main distribution paths in commercial panelboards and loadcenters.\u003c\/li\u003e \u003cli\u003eUpgrade or retrofit 3-phase electrical rooms in light industrial environments requiring robust overcurrent protection.\u003c\/li\u003e \u003cli\u003eInstall as a reliable safety device in emergency electrical systems where stable trip performance is critical.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eTechnical specifications\u003c\/h2\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 JXD63S400A\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\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eInstallation and best practices\u003c\/h2\u003e\n\u003cp\u003eFor optimal performance, ensure mounting is solidly secured to the panelboard or loadcenter and that bus connections are clean and free of corrosion. Follow Siemens installation guidelines and verify compatibility with your specific OEM panelboard. When replacing a breaker, match the amperage, voltage rating, and pole configuration to maintain consistent protection characteristics and coordination with downstream devices.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349820756130,"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_230ae44a-4403-4267-82c1-b11055e22538.png?v=1764157701","url":"https:\/\/www.ampstate.com\/products\/siemens-jxd63s400a-400a-600v-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}