{"product_id":"siemens-hjxd63b300-300a-600v-3-pole-bolt-on-circuit-breaker","title":"Siemens HJXD63B300 - 300 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eSiemens HJXD63B300 — the 300 A, 600 V, 3-pole bolt-on molded case circuit breaker designed to protect your panelboards and load centers with precision and confidence. This unit is purpose-built for dependable branch circuit overcurrent and short-circuit protection in homes, offices, and light industrial environments.\u003c\/p\u003e \u003cp\u003eKey advantages that set it apart:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e delivers a rigid, vibration-resistant bus connection, reducing the risk of loose contacts and arc wear in crowded electrical enclosures.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e provides stable, repeatable protection by combining long-term overload detection with instantaneous short‑circuit interruption, helping to minimize nuisance trips while quickly isolating faults.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThree-pole configuration\u003c\/strong\u003e supports three-phase power distribution, making it ideal for commercial spaces and light industrial equipment where balanced protection matters most.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-friendly compatibility\u003c\/strong\u003e is designed to work with matching Siemens load centers and panelboards, ensuring seamless integration and coordinated protection across the system.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile application\u003c\/strong\u003e suitable for residential, commercial, and light industrial applications that demand reliable fault isolation and durable performance.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eWhat it protects and how it helps you\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003ePrevents damage from overcurrent events and short circuits by interrupting fault currents at the source, safeguarding downstream equipment and reducing downtime.\u003c\/li\u003e \u003cli\u003eHelps maintain electrical safety and service continuity in panelboards and load centers where steady operation and predictable trips are essential.\u003c\/li\u003e \u003cli\u003eFacilitates future upgrades or retrofits by offering a compatible bolt-on solution that plugs into existing Siemens ecosystems without custom adapters.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eTechnical specifications at a glance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eManufacturer: Siemens\u003c\/li\u003e \u003cli\u003ePart number: HJXD63B300\u003c\/li\u003e \u003cli\u003eType: Thermal-magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003eAmperage rating: 300 A\u003c\/li\u003e \u003cli\u003eVoltage rating: 600 V\u003c\/li\u003e \u003cli\u003ePoles: 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\u003eIdeal for electricians and facilities professionals seeking a robust, field-proven protection solution, the Siemens HJXD63B300 delivers clear fault isolation, durable construction, and seamless compatibility with Siemens panelboards. Add this bolt-on, 3‑pole circuit breaker to your next panel upgrade or service improvement to ensure reliable, long-lasting protection for three-phase circuits.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349809975458,"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_9a8b0855-17de-48cd-b3f6-e7e1b96669cd.png?v=1764157459","url":"https:\/\/www.ampstate.com\/products\/siemens-hjxd63b300-300a-600v-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}