{"product_id":"siemens-jd2b300-circuit-breaker","title":"Siemens | JD2B300 | Circuit Breaker | 300A | 2-Pole | Bolt-On","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Siemens JD2B300 Circuit Breaker—a robust 300-amp, 2-pole bolt-on protection device designed for maintenance, retrofit, and replacement scenarios where exact specs matter. This breaker is built to deliver reliable, high-current protection in demanding electrical environments, empowering you to safeguard feeders and equipment with confidence.\u003c\/p\u003e \u003ch2\u003eKey specifications\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eAmperage: 300 A\u003c\/li\u003e \u003cli\u003ePoles: 2-Pole\u003c\/li\u003e \u003cli\u003eMounting: Bolt-On\u003c\/li\u003e \u003cli\u003ePart reference: JD2B300\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhy this breaker stands out\u003c\/h2\u003e\n\u003cp\u003eSiemens is a trusted name in electrical protection, and the JD2B300 is engineered for consistency across service, retrofit, and replacement projects. The bolt-on design simplifies installation and servicing in panels that require a secure, high-current interrupt device, while the 2-pole configuration delivers coordinated protection for both hot legs and the circuit being served. This combination makes it ideal for high-demand feeders and main circuits where stability and quick isolation are essential.\u003c\/p\u003e \u003ch2\u003eIdeal use cases\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eMaintenance: Replace aging or failing breakers in existing panels to restore safe, continuous operation.\u003c\/li\u003e \u003cli\u003eRetrofit: Upgrade panel protection in systems that require a solid 300 A, 2-pole bolt-on solution.\u003c\/li\u003e \u003cli\u003eReplacement: Substitution in installations that specify JD2B300 for compatibility and performance.\u003c\/li\u003e \u003cli\u003eHigh-current circuits: Protect feeders and equipment that operate near the upper limits of standard residential or light commercial panels.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eInstallation and compatibility guidance\u003c\/h2\u003e\n\u003cp\u003eBefore purchasing, confirm fit and ratings to ensure seamless compatibility with your panel backbone and bus arrangement. The JD2B300 part number is the most reliable reference for matching components, so verify that your panel model and labeling align with a 300 A, 2-pole bolt-on configuration. When installing, follow standard electrical safety practices: de-energize the system, lockout\/tagout as required, and torque connections to your panel manufacturer’s specifications.\u003c\/p\u003e \u003ch2\u003eHow it compares to alternatives\u003c\/h2\u003e\n\u003cp\u003eFor applications needing firm bolt-on mounting and higher current protection, the JD2B300 provides a streamlined, serviceable solution compared to plug-in or lower-current options. Its two-pole design ensures simultaneous interruption of both conductors, enhancing arc control and system safety during faults. If your project requires a precise 300 A rating and a bolt-on form factor, this Siemens breaker is purpose-built to meet those demands.\u003c\/p\u003e \u003ch2\u003eWhat you gain with the JD2B300\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eReliable high-current protection for demanding circuits\u003c\/li\u003e \u003cli\u003eEase of installation with a secure bolt-on mounting\u003c\/li\u003e \u003cli\u003eClear reference for compatibility through the JD2B300 part number\u003c\/li\u003e \u003cli\u003eClear fit-for-purpose use in maintenance, retrofit, and replacement projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46424423628962,"sku":"JD2B300","price":310.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens-jd2b300-circuit-breaker-300a-2-pole-bolt-985.webp?v=1789356976","url":"https:\/\/www.ampstate.com\/products\/siemens-jd2b300-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}