{"product_id":"siemens-njg3b300-circuit-breaker","title":"Siemens | NJG3B300 | Circuit Breaker | 300A | 3-Pole | 600V | Bolt-On","description":"\u003cdiv\u003e\n\u003cp\u003eEngineered by Siemens for demanding industrial power distribution, the NJG3B300 circuit breaker delivers dependable protection for three-phase systems. With a 300A rating, 3 poles, and a 600V maximum, it's built to handle substantial loads while maintaining precise protection. The bolt-on design simplifies installation and field retrofits, making it a practical choice for maintenance, retrofit, and replacement projects where exact specifications matter.\u003c\/p\u003e \u003ch3\u003eKey specifications at a glance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 300A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3-Pole\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 600V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Bolt-On\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy choose the NJG3B300 for your system\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eSecure bolt-on mounting provides stable, vibration-resistant installation in rugged environments.\u003c\/li\u003e \u003cli\u003ePrecisely matches systems that require a 300A, 3-pole, 600V breaker, reducing guesswork in maintenance or upgrades.\u003c\/li\u003e \u003cli\u003ePart number NJG3B300 serves as the definitive compatibility reference, helping you avoid mismatches during replacement or retrofit.\u003c\/li\u003e \u003cli\u003eIdeal for maintenance, retrofit, and replacements where continuity of protection and quick serviceability matter.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eCompatibility note:\u003c\/strong\u003e Confirm fit and ratings against your panel or MCC before ordering; relying on the NJG3B300 part number is the best reference for compatibility.\u003c\/p\u003e \u003cp\u003eUse scenarios include updating legacy panel boards to support higher-load three-phase equipment, replacing aging breakers that no longer meet demand, or upgrading to a robust Siemens solution within an existing electrical distribution setup. If your system operates at up to 600V and is configured for three-phase protection, the Siemens NJG3B300 is designed to integrate smoothly, maintain reliability, and support long service life in industrial environments.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46426648215714,"sku":"NJG3B300","price":9873.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_16d3a2fb-5d93-424c-9206-5031ec4b178f.png?v=1765492977","url":"https:\/\/www.ampstate.com\/products\/siemens-njg3b300-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}