{"product_id":"siemens-cjd63b400-400a-600v-3-pole-bolt-on-circuit-breaker","title":"Siemens CJD63B400 - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eFor panelboards and load centers that demand robust, reliable protection, the Siemens CJD63B400 delivers. This 400 A, 600 V, 3-pole bolt-on molded-case circuit breaker is built to guard your electrical system against overloads and short circuits with precision and durability.\u003c\/p\u003e \u003ch3\u003eKey design features\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e provides a rigid, vibration-resistant bus connection, reducing movement and wear over time.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection by combining overload sensing with fast magnetic response for high fault currents.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e3-pole, 400 A, 600 V rating\u003c\/strong\u003eDesigned for demanding branch-circuit protection in larger panelboards and load centers.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible\u003c\/strong\u003e fully compatible with matching Siemens load centers and panelboards for streamlined replacements and serviceability.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile application\u003c\/strong\u003e suitable for residential, commercial, and light industrial installations that require dependable, code-compliant protection.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this matters\u003c\/h3\u003e\n\u003cp\u003eIn environments where vibrations, electrical noise, or high fault currents are a concern, the CJD63B400’s bolt-on construction minimizes bus-bar movement and connection wear, translating to longer service life and fewer mid-service interruptions. The thermal-magnetic trip unit ensures protective actions are precise and repeatable, helping you maintain selectivity and downstream coordination without nuisance trips.\u003c\/p\u003e \u003ch3\u003eUse cases and ideal applications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eLarge residential service panels requiring 400 A protection with solid, rock-solid mounting.\u003c\/li\u003e \u003cli\u003eCommercial panelboards where reliable short-circuit protection is critical for safety and uptime.\u003c\/li\u003e \u003cli\u003eLight industrial equipment disconnects and distribution boards that benefit from durable bolt-on assemblies.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eAvailable from AmpState, the Siemens CJD63B400 is the trusted choice when you need a rugged, compatible, and consistent protection device for your electrical distribution system. Its combination of secure mounting, precise trip logic, and OEM compatibility makes it a practical upgrade or replacement option for demanding installations.\u003c\/p\u003e \u003ch3\u003eTechnical specifications at a glance\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 CJD63B400\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\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349779927202,"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_5c3da419-a45e-4109-a437-39d3769ac595.png?v=1764156467","url":"https:\/\/www.ampstate.com\/products\/siemens-cjd63b400-400a-600v-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}