{"product_id":"siemens-km3b300-circuit-breaker","title":"Siemens | KM3B300 | Circuit Breaker | 300A | 3-Pole | 600V | 50kA | Bolt-On","description":"\u003cdiv\u003e\n\u003cp\u003eThe Siemens KM3B300 Circuit Breaker is a robust three‑pole protection device designed for reliable power distribution in industrial and commercial settings. With a 300 A rating, 600 V maximum, and a 50 kA interrupt capacity, it delivers dependable protection for demanding electrical feeders. The bolt‑on mounting makes field installation straightforward, enabling swift maintenance, retrofit, or replacement without extensive panel modification.\u003c\/p\u003e \u003ch3\u003eSpecifications at a glance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eAmperage: 300 A\u003c\/li\u003e \u003cli\u003ePoles: 3-Pole\u003c\/li\u003e \u003cli\u003eVoltage rating: 600 V\u003c\/li\u003e \u003cli\u003eInterrupting capacity: 50 kA\u003c\/li\u003e \u003cli\u003eMounting: Bolt-On\u003c\/li\u003e \u003cli\u003ePart number: KM3B300\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this KM3B300 stands out\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eExact spec alignment for maintenance, retrofit, or replacement in compatible Siemens electrical systems, reducing guesswork and ensuring reliable protection on refitted panels.\u003c\/li\u003e \u003cli\u003eThree‑phase protection with a bolt‑on footprint that simplifies installation and minimizes downtime during service events.\u003c\/li\u003e \u003cli\u003eHigh 50 kA interrupt rating equips you to handle fault currents common in motors, pumps, and large feeders without compromising safety or performance.\u003c\/li\u003e \u003cli\u003eDurable construction designed for industrial environments, delivering consistent performance across temperature and vibration conditions typical in commercial facilities.\u003c\/li\u003e \u003cli\u003ePart of the Siemens KM3B family, offering a seamless path for legacy systems and future upgrades where exact compatibility matters most.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eMaintenance, retrofit, or replacement on existing Siemens panels that require KM3B300 specifications.\u003c\/li\u003e \u003cli\u003eThree‑phase feeders in manufacturing lines, HVAC motor centers, or power distribution for data processing rooms where reliability is critical.\u003c\/li\u003e \u003cli\u003eFacilities planning upgrades to higher fault‑current environments, ensuring continued protection without changing the panel architecture.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eInstallation and compatibility tips\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eAlways confirm fit and ratings before ordering. The KM3B300 is your best reference for compatibility with existing Siemens equipment.\u003c\/li\u003e \u003cli\u003eVerify panel labeling and footprint to ensure bolt‑on mounting aligns with your enclosure and bus bar configuration.\u003c\/li\u003e \u003cli\u003eDuring installation, follow standard electrical safety practices and torque specifications for mounting hardware to maintain protective integrity.\u003c\/li\u003e \u003cli\u003eUse as a precise replacement in systems currently configured for KM3B300 or compatible KM3B series breakers to avoid mismatches in trip curves and wiring terminations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46424381096098,"sku":"KM3B300","price":310.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens-km3b300-circuit-breaker-300a-3-pole-600v-50ka-bolt-989.webp?v=1789347750","url":"https:\/\/www.ampstate.com\/products\/siemens-km3b300-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}