{"product_id":"siemens-njg3b400-400a-3p-600v-circuit-breaker","title":"Siemens NJG3B400 Circuit Breaker, 400A, 3-Pole, 600V","description":"\u003cdiv\u003e\n\u003cp\u003eThe Siemens \u003cstrong\u003eNJG3B400\u003c\/strong\u003e Circuit Breaker is engineered for industrial electrical service, maintenance, and replacement projects where dependable overcurrent protection matters. With a \u003cstrong\u003e400 A\u003c\/strong\u003e rating, \u003cstrong\u003e3-pole\u003c\/strong\u003e configuration, and a \u003cstrong\u003e600 V\u003c\/strong\u003e maximum, this breaker is built to withstand demanding environments while delivering precise shutdown control when faults occur.\u003c\/p\u003e \u003cp\u003eDesigned to align with Siemens gear and compatible switchgear when the part number is verified, the NJG3B400 streamlines part selection in ongoing maintenance or upgrade initiatives. Its robust construction supports continuous operation in manufacturing floors, utility rooms, and other industrial settings where uptime is critical.\u003c\/p\u003e \u003ch3\u003eKey specifications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Siemens\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e NJG3B400\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Circuit Breaker\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 400 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 600 V\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eIdeal uses\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eIndustrial electrical service panels and distribution boards\u003c\/li\u003e \u003cli\u003eMotor control centers (MCCs) and feeder protection\u003c\/li\u003e \u003cli\u003eReplacement in legacy Siemens installations that require precise part-number compatibility\u003c\/li\u003e \u003cli\u003eUpgrades in facilities where a 400 A, 3-pole, 600 V protection device is called for\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy the NJG3B400 stands out\u003c\/h3\u003e\n\u003cp\u003eWhat sets this breaker apart is the explicit alignment between the \u003cstrong\u003eNJG3B400\u003c\/strong\u003e part number and its application requirements. By prioritizing part-number compatibility, it minimizes guesswork during replacements and upgrades, helping facilities maintain consistent protection characteristics across existing gear. This is especially valuable in environments where exact screw-terminal layouts, bus configurations, and trip characteristics must match the current installation.\u003c\/p\u003e \u003ch3\u003eCompatibility and installation guidance\u003c\/h3\u003e\n\u003cp\u003eBefore installation, verify fit by cross-referencing the \u003cstrong\u003eNJG3B400\u003c\/strong\u003e part number with your equipment’s specifications and the system’s voltage and pole requirements. Ensure the enclosure, bus configuration, and conductor sizing support a \u003cstrong\u003e400 A, 3-pole\u003c\/strong\u003e device rated for \u003cstrong\u003e600 V\u003c\/strong\u003e. If you need confirmation on compatibility, send us your installation details and we’ll help ensure the right match for your application.\u003c\/p\u003e \u003cp\u003eNeed help matching a part number or confirming compatibility? Message us and we'll help.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"AmpState","offers":[{"title":"Default Title","offer_id":46415971549346,"sku":"NJG3B400","price":47268.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens-njg3b400-circuit-breaker-400a-3-pole-600v-breakers-597.webp?v=1789217447","url":"https:\/\/www.ampstate.com\/products\/siemens-njg3b400-400a-3p-600v-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}