{"product_id":"siemens-hhjxd63b300-300a-600v-3-pole-bolt-on-circuit-breaker","title":"Siemens HHJXD63B300 - 300 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eSiemens HHJXD63B300 is a rugged, high-capacity bolt-on molded case circuit breaker designed to protect your electrical system with precision. Rated at 300 A and 600 V, this 3-pole unit delivers dependable branch-circuit overcurrent and short-circuit protection for panelboards and loadcenters in demanding environments.\u003c\/p\u003e \u003cp\u003eBuilt for reliability in real-world installations, the bolt-on mounting provides a secure, vibration-resistant bus connection that stays tight even in settings with equipment vibration or cycling loads. The result is consistent protection performance across a wide range of operating conditions.\u003c\/p\u003e \u003ch2\u003eKey benefits that matter in the field\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting:\u003c\/strong\u003e Ensures a rigid, long-lasting connection to the bus, reducing the risk of loose contacts and nuisance trips.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit:\u003c\/strong\u003e Combines precise thermal overload protection with instantaneous magnetic response to shield circuits from both gradual faults and sudden surges.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThree-pole design:\u003c\/strong\u003e Ideal for three-phase systems common in commercial and light industrial applications, while still suitable for residential setups requiring robust protection.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHigh-capacity rating:\u003c\/strong\u003e 300 A at 600 V provides a capable solution for larger branch circuits and higher fault-current scenarios.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible:\u003c\/strong\u003e Designed to integrate with matching Siemens OEM load centers and panelboards for a streamlined replacement or upgrade.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhy this design makes a difference\u003c\/h2\u003e\n\u003cp\u003eIn panel installations, the connection integrity between the breaker and the bus is a common source of reliability issues. The HHJXD63B300’s bolt-on approach minimizes movement, reduces wear over time, and sustains protective performance even under vibration or frequent cycling. The thermal-magnetic trip mechanism delivers predictable, repeatable responses—long-time protection against sustained overloads and immediate action on short circuits—so equipment and wiring stay safer with less downtime.\u003c\/p\u003e \u003ch2\u003eIdeal use cases\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eUpgrading service panels in commercial spaces or light industrial facilities where 3-phase protection is required.\u003c\/li\u003e \u003cli\u003eReplacing aging or incompatible breakers in OEM panelboards that require a Siemens bolt-on solution.\u003c\/li\u003e \u003cli\u003eProtecting sizable branch circuits with a single, robust unit capable of handling higher fault currents at once.\u003c\/li\u003e \u003cli\u003eApplications spanning residential, commercial, and light industrial environments where dependable overcurrent protection is essential.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eSpecifications at a glance\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 HHJXD63B300\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 300 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 \u003cp\u003eFor professionals seeking a reliable, installation-friendly protection solution within Siemens’ ecosystem, the HHJXD63B300 from AmpState offers a compelling combination of strength, compatibility, and performance. Bring secure protection to your panelboards and loadcenters—order this 3-pole bolt-on circuit breaker and keep critical circuits safeguarded.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349809418402,"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_a375e262-67ab-4d84-b8de-31a550ffeb2f.png?v=1764157437","url":"https:\/\/www.ampstate.com\/products\/siemens-hhjxd63b300-300a-600v-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}