{"product_id":"siemens-clj63b300","title":"Siemens CLJ63B300 300A 3-Pole 600 V Circuit Breaker Current-Limiting","description":"\u003cdiv\u003e\n\u003cp\u003eThe Siemens CLJ63B300 is a high-capacity, three-pole circuit breaker engineered for demanding electrical systems. With a 300 A current rating and a 600 V voltage rating, this current-limiting breaker is built to protect large feeders and motors while keeping power disruption to a minimum. Identified by part number CLJ63B300, it’s a reliable choice for industrial panels and commercial distribution where rapid fault clearing matters.\u003c\/p\u003e \u003ch2\u003eKey specifications\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003ePart number: CLJ63B300\u003c\/li\u003e \u003cli\u003eCurrent rating: 300 A\u003c\/li\u003e \u003cli\u003ePoles: 3\u003c\/li\u003e \u003cli\u003eVoltage rating: 600 V\u003c\/li\u003e \u003cli\u003eTechnology: current-limiting design\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhy current-limiting matters\u003c\/h2\u003e\n\u003cp\u003eCurrent-limiting circuit breakers like the CLJ63B300 reduce the energy that flows during a fault. By constraining let-through current, they shorten fault duration, minimize arcing energy, and help protect conductors, wiring insulation, and connected equipment from severe damage. This translates to faster, safer fault clearance and improved system reliability, especially in panels with heavy motor loads or high-energy feeders.\u003c\/p\u003e \u003ch2\u003eIdeal applications\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eLarge industrial feeders feeding manufacturing lines or processing equipment\u003c\/li\u003e \u003cli\u003eMotor control centers and heavy-duty distribution panels\u003c\/li\u003e \u003cli\u003eCommercial service disconnects and main distribution sections in power systems up to 600 V\u003c\/li\u003e \u003cli\u003e retrofit or replacement in Siemens-compatible panels requiring a 300 A, 3-pole, 600 V, current-limiting protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eBenefits you’ll notice\u003c\/h2\u003e\n\u003cp\u003eBeyond basic overcurrent protection, the CLJ63B300 offers:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eEnhanced protection for downstream devices and cables through reduced fault energy\u003c\/li\u003e \u003cli\u003eQuicker fault isolation due to optimized trip performance in demanding environments\u003c\/li\u003e \u003cli\u003eBetter protection coordination within multi-stage protection schemes, helping minimize downtime\u003c\/li\u003e \u003cli\u003eClear, identifiable part number and design consistent with Siemens panel ecosystems for easier maintenance and replacements\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eInstallation and compatibility tips\u003c\/h2\u003e\n\u003cp\u003eUse the CLJ63B300 as a drop-in replacement in Siemens panels that support this CLJ-series, ensuring electrical and mechanical compatibility with existing bus configurations and enclosure footprint. Confirm the panel’s voltage rating and conductor sizing align with a 600 V system and 300 A protection. For best results, pair with correctly rated conductors and follow standard safety practices during replacement or retrofits.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46423254139042,"sku":"CLJ63B300","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_229276d9-908d-46df-93e5-6fe31866e0ff.png?v=1765492975","url":"https:\/\/www.ampstate.com\/products\/siemens-clj63b300","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}