{"product_id":"siemens-jj3b400-circuit-breaker","title":"Siemens | JJ3B400 | Circuit Breaker | 400A | 3-Pole | 600V","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Siemens JJ3B400 Circuit Breaker — a purpose-built, industrial-grade protective device engineered for demanding 3-phase power systems. With a 400A rating, 3-pole configuration, and a 600V operating capacity, this breaker is designed to keep large commercial and light industrial panels running smoothly while delivering dependable overcurrent protection.\u003c\/p\u003e \u003cp\u003eDesigned for maintenance, retrofit, and replacement projects where exact specification matching matters, the JJ3B400 delivers a precise fit and reliable performance when upgrading or preserving your 3-phase distribution setup. The part number JJ3B400 is the strongest reference for compatibility, and you should confirm fit and ratings before ordering to ensure seamless integration with your panel.\u003c\/p\u003e \u003ch3\u003eKey specifications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 400 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3-Pole (three-phase protection)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage rating:\u003c\/strong\u003e 600 V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Ideal for 3-phase distribution panels in commercial and light industrial environments\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this Siemens JJ3B400 stands out\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eExact spec alignment:\u003c\/strong\u003e 400A, 3-pole, 600V configuration designed to match Siemens panel systems and compatible setups, reducing retrofit headaches.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDurable, field-ready design:\u003c\/strong\u003e Built for frequent switching in demanding environments, providing consistent protection over time.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClear compatibility path:\u003c\/strong\u003e The JJ3B400 part number is your most reliable reference when verifying replacement or upgrade options.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWho this is ideal for\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eFacility maintenance teams responsible for safeguarding large distribution panels\u003c\/li\u003e \u003cli\u003eElectrical contractors performing panel retrofits or replacements in commercial or light industrial sites\u003c\/li\u003e \u003cli\u003ePlants or facilities upgrading to robust 3-phase protection within 600V systems\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eCommon use cases and practical scenarios\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eReplacing aging or worn-out breakers in 3-phase 600V panels to restore reliable protection\u003c\/li\u003e \u003cli\u003eRetrofitting legacy systems to meet modern 400A protection requirements without changing panel footprints\u003c\/li\u003e \u003cli\u003eInstalling in new or replacement projects where Siemens JJ3B400 is specified as the exact part reference\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eOrdering tip: Always confirm the breaker’s fit and ratings against your panel model and wiring configuration. Rely on the JJ3B400 part number as the best reference to ensure compatibility and dependable protection for your three-phase, 600V system.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46424438702242,"sku":"JJ3B400","price":310.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens-jj3b400-circuit-breaker-400a-3-pole-600v-594.webp?v=1789359755","url":"https:\/\/www.ampstate.com\/products\/siemens-jj3b400-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}