{"product_id":"siemens-jd63b300l-300a-600v-3-pole-bolt-on-circuit-breaker","title":"Siemens JD63B300L - 300 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eSiemens JD63B300L is a robust 300A, 600V, 3‑pole bolt‑on molded‑case circuit breaker designed to safeguard your electrical distribution. Built for dependable branch circuit overcurrent and short‑circuit protection in panelboards and loadcenters, it delivers reliable performance where it matters most. Available through AmpState for dependable sourcing and fast fulfillment.\u003c\/p\u003e \u003cp\u003eKey advantages you’ll notice in real‑world panels:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt‑on mounting\u003c\/strong\u003e provides a rigid, vibration‑resistant bus connection that stays tight over time, reducing nuisance trips from loose connections.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal‑magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection by reacting to both overload (thermal) and short‑circuit (magnetic) conditions.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM compatibility\u003c\/strong\u003e designed to pair with matching Siemens OEM load centers and panelboards for a streamlined, integrated protection system.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile application\u003c\/strong\u003e suitable for residential, commercial, and light industrial environments where dependable feeder protection is essential.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eTechnical specifications\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: JD63B300L\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\u003ePrimary use\u003c\/strong\u003e: Branch circuit overcurrent and short‑circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eUse scenarios and practical tips:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eInstall in service panelboards or distribution panels to protect feeders feeding subpanels, motor circuits, and lighting mains in commercial spaces or light industrial facilities.\u003c\/li\u003e \u003cli\u003eWhen replacing an aging breaker or expanding capacity, JD63B300L ensures compatibility with Siemens panel hardware, reducing retrofit complexity.\u003c\/li\u003e \u003cli\u003eEnsure proper torque on mounting bolts per manufacturer guidelines to maintain that vibration‑resistant connection in areas with equipment or HVAC loads.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349814497442,"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_28a99ae1-4136-430a-9439-0a8224921127.png?v=1764157610","url":"https:\/\/www.ampstate.com\/products\/siemens-jd63b300l-300a-600v-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}