{"product_id":"siemens-jj2b400-circuit-breaker","title":"Siemens | JJ2B400 | Circuit Breaker | 400A | 2-Pole | 600V","description":"\u003cdiv\u003e\n\u003cp\u003eSiemens JJ2B400 Circuit Breaker is a rugged 400A, 2-Pole device designed to protect high-demand electrical feeders in 600V systems. Whether you’re performing routine maintenance, retrofitting an existing panel, or replacing a failed breaker, the JJ2B400 delivers dependable protection and straightforward compatibility with Siemens’ footprint.\u003c\/p\u003e \u003cp\u003eFeaturing a two-pole design, this breaker effectively interrupts both hot lines during a fault, helping to prevent equipment damage and enhance personnel safety in demanding commercial and industrial environments. Its 600V rating makes it suitable for a wide range of applications where robust overcurrent protection is required, from service entrances to heavy-duty distribution panels.\u003c\/p\u003e \u003ch3\u003eKey specifications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eAmperage rating: 400A\u003c\/li\u003e \u003cli\u003ePoles: 2-Pole\u003c\/li\u003e \u003cli\u003eVoltage rating: 600V\u003c\/li\u003e \u003cli\u003ePart reference: JJ2B400\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this JJ2B400 stands out\u003c\/h3\u003e\n\u003cp\u003eUnlike generic breakers, this Siemens unit is crafted to align precisely with the JJ2B400 footprint and compatibility matrix. It’s a reliable replacement when your panel or service equipment specifies a 400A, 2-pole device in a 600V system. By sticking with Siemens components, you simplify future service and maintain consistent performance across your electrical system.\u003c\/p\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eMaintenance and retrofit projects requiring an exact JJ2B400 replacement\u003c\/li\u003e \u003cli\u003eReplacement for failed 400A, 2-pole breakers in Siemens-compatible panels\u003c\/li\u003e \u003cli\u003eFeeder protection for large commercial or light industrial circuits operating up to 600V\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eFit, compatibility, and installation notes\u003c\/h3\u003e\n\u003cp\u003eAlways verify fit and ratings before ordering. The part number JJ2B400 is the most reliable reference for compatibility with your Siemens panel or service equipment. If your system requires a 400A, 2-pole breaker in the JJ2B family, this unit is designed to drop into the same slot and wiring configuration with minimal trouble.\u003c\/p\u003e \u003ch3\u003ePractical tips for best results\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eKeep your panel labeling and the manufacturer’s data sheet handy during replacement to confirm the correct trip characteristics and mounting style\u003c\/li\u003e \u003cli\u003eFollow lockout\/tagout procedures and disconnect power before servicing\u003c\/li\u003e \u003cli\u003eInspect connected wiring for wear or damage and replace as needed to prevent nuisance trips\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46427517714594,"sku":"JJ2B400","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_ad06fdd7-931c-4a09-bfbe-d05329579cd6.png?v=1765492978","url":"https:\/\/www.ampstate.com\/products\/siemens-jj2b400-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}