{"product_id":"siemens-cjd63l400-400a-600v-3-pole-bolt-on-circuit-breaker","title":"Siemens CJD63L400 - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Siemens CJD63L400 — a 400A, 600V, 3-pole bolt-on molded case circuit breaker built to shield panelboards and loadcenters from overcurrent and short circuits. From AmpState, this unit pairs industrial-grade reliability with a practical, easy-install design for demanding electrical installations.\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 delivers a rigid, vibration-resistant bus connection that stays tight under panel activity, reducing the risk of loose contacts and arc faults.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e provides stable, repeatable protection by combining thermal sensing for overloads with magnetic sensing for instantaneous short-circuit response, maintaining shielded circuits across temperature variations.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThree-pole configuration\u003c\/strong\u003e supports balanced protection for three-phase systems, making it well-suited for commercial and light industrial applications while also accommodating residential 3-phase setups.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible design\u003c\/strong\u003e is engineered to be compatible with matching Siemens OEM loadcenters and panelboards, ensuring proper form, fit, and electrical coordination.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eIdeal applications and use cases\u003c\/h2\u003e\n\u003cp\u003eDesigned for branch circuit protection, the CJD63L400 excels in service upgrades, panelboard modernization, and new installations where a robust 3-pole, 400A breaker is required. It’s appropriate for residential, commercial, and light industrial environments where reliable protection and durable construction matter most.\u003c\/p\u003e \u003ch2\u003eKey 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 CJD63L400\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 400 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage rating:\u003c\/strong\u003e 600 V\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\u003ePractical guidance and benefits\u003c\/h2\u003e\n\u003cp\u003eChoosing a bolt-on MCCB like the CJD63L400 helps ensure long-term panel reliability in environments with frequent vibration or movement. The bolt-on connection minimizes bus-bar looseness, while the thermal-magnetic trip unit delivers predictable protection across a wide range of operating conditions. This minimizes nuisance trips during startup surges and keeps critical loads protected during faults.\u003c\/p\u003e \u003cp\u003eIf you’re updating panelboards or adding a main feeder in a three-phase system, the CJD63L400 provides a proven, compatible solution that aligns with Siemens' engineered ecosystem. Its 400A rating makes it suitable for substantial distribution needs without compromising on safety or performance.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349780156578,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens-cjd63l400-400-a-600-v-3-pole-bolt-on-circuit-breaker-189.webp?v=1788723842","url":"https:\/\/www.ampstate.com\/products\/siemens-cjd63l400-400a-600v-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}