{"product_id":"siemens-hhjd63b400-400a-600v-3-pole-bolt-on-circuit-breaker","title":"Siemens HHJD63B400 - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThe Siemens HHJD63B400 is a high-capacity 400 A, 600 V, 3-pole bolt-on molded case circuit breaker designed for reliable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built for demanding residential, commercial, and light industrial environments, this unit delivers consistent protection performance when it’s needed most.\u003c\/p\u003e \u003ch2\u003eWhy it stands out\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e: A rigid, vibration‑resistant bus connection minimizes movement and arcing, improving long-term reliability in busy electrical rooms.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e: Combines precise thermal overload protection with rapid magnetic response for dependable trips across varying fault conditions.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThree-pole protection\u003c\/strong\u003e: Ensures synchronized interruption across all phases in 3‑phase systems, preserving balance and safety.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible design\u003c\/strong\u003e: Engineered to pair with matching Siemens OEM load centers and panelboards for seamless retrofits or new installations.\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 HHJD63B400\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\u003eIdeal applications\u003c\/h2\u003e\n\u003cp\u003eDesigned for panelboards and load centers that serve three-phase distribution in homes, offices, retail spaces, and light industrial facilities. If you need dependable, balanced protection for multi‑wire circuits and want a solution that performs consistently under vibration and electrical stress, this 3‑pole bolt-on breaker from Siemens is a strong fit.\u003c\/p\u003e \u003ch2\u003eInstallation and reliability tips\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eVerify the panelboard or load center is rated for bolt-on breakers and ensure bus connections are clean before mounting.\u003c\/li\u003e \u003cli\u003eTorque mounting hardware to the panel manufacturer’s specifications to preserve the integrity of the bolt-on connection against vibration.\u003c\/li\u003e \u003cli\u003eWhen possible, align this breaker with other Siemens protection devices to maintain a cohesive and predictable protection strategy across the system.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349809287330,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens-hhjd63b400-400-a-600-v-3-pole-bolt-on-circuit-breaker-734.webp?v=1788731251","url":"https:\/\/www.ampstate.com\/products\/siemens-hhjd63b400-400a-600v-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}