{"product_id":"siemens-jd3b300-circuit-breaker","title":"Siemens | JD3B300 | Circuit Breaker | 300A | 3-Pole | 240V | 65kA","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Siemens JD3B300 circuit breaker—a robust, three-pole protection solution designed for demanding three-phase systems. With a 300 A rating, 240 V operation, and a 65 kA breaking capacity, it’s engineered to safeguard feeders, motors, and transformers in industrial and commercial panels. Perfect for maintenance, retrofit, or replacement projects where exact specifications matter, the JD3B300 ensures continuity and protection without guesswork.\u003c\/p\u003e \u003ch2\u003eKey specifications\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eAmperage: 300 A\u003c\/li\u003e \u003cli\u003ePoles: 3-Pole\u003c\/li\u003e \u003cli\u003eVoltage: 240 V\u003c\/li\u003e \u003cli\u003eShort-Circuit Breaking Capacity: 65 kA\u003c\/li\u003e \u003cli\u003ePart Number: JD3B300\u003c\/li\u003e \u003cli\u003eBrand: Siemens\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhy this breaker matters\u003c\/h2\u003e\n\u003cp\u003eIn three-phase power systems, precise overcurrent protection is crucial. The JD3B300’s 65 kA breaking capacity supports higher fault currents common in industrial environments, reducing the risk of equipment damage and unexpected downtime. Its 240 V rating makes it compatible with standard commercial and light industrial distribution, delivering predictable, reliable trip behavior when faults occur.\u003c\/p\u003e \u003ch2\u003eFit, compatibility, and installation tips\u003c\/h2\u003e\n\u003cp\u003eAlways confirm fit and ratings before ordering. The part number JD3B300 is your most reliable reference for compatibility with Siemens panels and existing protection schemes. When replacing like-for-like, ensure the panel’s bus configuration and protective coordination align with a 3-pole, 300 A, 240 V device to maintain correct fault current paths and code-compliant protection.\u003c\/p\u003e \u003ch2\u003eUse cases and ideal environments\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eThree-phase motor circuits driving conveyors, pumps, and compressors\u003c\/li\u003e \u003cli\u003ePower distribution panels in manufacturing facilities and warehouses\u003c\/li\u003e \u003cli\u003eUPS and critical load sections in data centers requiring dependable short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhat sets it apart\u003c\/h2\u003e\n\u003cp\u003eSiemens JD3B300 is purpose-built to integrate seamlessly with Siemens panels and standard 3-phase distributions. Its 65 kA breaking capacity delivers strong fault resilience, while the 300 A, 3-pole, 240 V configuration provides a precise, matched protection profile for typical industrial and commercial installations. This isn’t a generic part—it’s a deliberate match for systems that demand reliable, predictable protection in everyday operation and during fault events.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46424428544162,"sku":"JD3B300","price":310.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens-jd3b300-circuit-breaker-300a-3-pole-240v-65ka-787.webp?v=1789358423","url":"https:\/\/www.ampstate.com\/products\/siemens-jd3b300-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}