{"product_id":"siemens-hjxd63b350-350a-600v-3-pole-bolt-on-circuit-breaker","title":"Siemens HJXD63B350 - 350 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Siemens HJXD63B350—a robust 350-amp, 600-volt, 3-pole bolt-on molded case circuit breaker (MCCB) built to safeguard panelboards and loadcenters from overcurrent and short-circuit events. Designed for dependable, long-term performance in residential, commercial, and light industrial environments, this breaker blends heavy-duty protection with straightforward installation.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e—provides a rigid, vibration-resistant connection to the bus bar, reducing the risk of loose contacts in busy electrical rooms and equipment racks.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e—delivers stable, repeatable protection by combining a thermal element for time-delayed overloads with a magnetic element for instantaneous short-circuit trips.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e3-pole design for true 3-phase protection\u003c\/strong\u003e—copies and protects all three phases simultaneously, ensuring coordinated disconnection and safer downstream equipment.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e600V rated performance\u003c\/strong\u003e—suitable for modern commercial distribution and light industrial systems that demand reliable high-voltage protection.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHigh current capacity\u003c\/strong\u003e—350A rating makes it ideal for feeder circuits, main disconnects, or critical branch circuits within Siemens-compatible panels.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM compatibility\u003c\/strong\u003e—designed to pair with matching Siemens loadcenters and panelboards for straightforward upgrades, replacements, or panel refurbishments.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy choose this breaker for your panel?\u003c\/h3\u003e\n\u003cp\u003eWhen you’re protecting demanding electrical layouts, you need a device you can trust to stay seated, perform predictably, and respond precisely when fault conditions appear. The HJXD63B350’s bolt-on construction minimizes vibration-induced contact issues, while the thermal-magnetic trip system provides nuanced protection that reduces nuisance trips without compromising safety. Its 3-pole framework ensures synchronized disconnection across all phases, helping maintain system integrity in three-phase installations.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eIdeal use cases\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eUpgrading or replacing components in Siemens OEM panelboards and loadcenters\u003c\/li\u003e \u003cli\u003eFeeder protection for commercial electrical rooms and light industrial equipment\u003c\/li\u003e \u003cli\u003eResidential-to-light-commercial panel upgrades where higher current protection is required\u003c\/li\u003e \u003cli\u003eInstallations where vibration resistance and reliable trip performance are priorities\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eTechnical snapshot\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eManufacturer: Siemens\u003c\/li\u003e \u003cli\u003ePart Number: HJXD63B350\u003c\/li\u003e \u003cli\u003eType: Thermal-magnetic molded case circuit breaker (MCCB)\u003c\/li\u003e \u003cli\u003eAmperage Rating: 350A\u003c\/li\u003e \u003cli\u003eVoltage Rating: 600V\u003c\/li\u003e \u003cli\u003eNumber of Poles: 3\u003c\/li\u003e \u003cli\u003eMounting Style: Bolt-on\u003c\/li\u003e \u003cli\u003eApplication: Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eEquip your panel with a breaker that blends rugged mechanical design with precise, reliable electrical protection. The Siemens HJXD63B350 is ready to help you deliver safer, more resilient power distribution in commercial and industrial settings—backed by compatibility with Siemens’ own panel ecosystems and a proven track record of dependable performance.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349810073762,"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_9b9b1443-0be3-43ce-a3fb-1ddd74754391.png?v=1764157462","url":"https:\/\/www.ampstate.com\/products\/siemens-hjxd63b350-350a-600v-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}