{"product_id":"siemens-qj3b125a02-circuit-breaker","title":"Siemens | QJ3B125A02 | Circuit Breaker | 125A | 3-Pole | 240V | Bolt-On","description":"\u003cdiv\u003e\n\u003cp\u003eIntroducing the Siemens \u003cstrong\u003eQJ3B125A02\u003c\/strong\u003e Circuit Breaker — a rugged 125A, 3-Pole device crafted for 240V systems. Designed for maintenance, retrofit, and replacement projects, this bolt-on breaker delivers dependable overcurrent protection in demanding electrical panels.\u003c\/p\u003e \u003ch3\u003eKey specifications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 125A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3-Pole\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 240V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Bolt-On\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e QJ3B125A02\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhat makes this bolt-on breaker stand out\u003c\/h3\u003e\n\u003cp\u003eSpecifically engineered for bolt-on panels that require a secure, vibration-resistant connection, the QJ3B125A02 delivers consistent trip performance in three-phase environments. Its robust construction and precise trip characteristics help protect feeders and downstream equipment from overloads and short circuits, reducing downtime and maintenance costs in industrial and commercial settings.\u003c\/p\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eMaintenance swaps in existing 3‑phase, 240V electrical systems\u003c\/li\u003e \u003cli\u003e Retrofit projects where matching 125A, 3-pole bolt-on breakers are required\u003c\/li\u003e \u003cli\u003eReplacement of aging or failed breakers in service panels designed for bolt-on installation\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eCompatibility and installation notes\u003c\/h3\u003e\n\u003cp\u003eConfirm fit and ratings before ordering. The \u003cstrong\u003eQJ3B125A02\u003c\/strong\u003e part number is the best reference for compatibility with Siemens panels that accept bolt-on, 3-pole breakers at 240V. This helps ensure a seamless replacement without panel modification.\u003c\/p\u003e \u003ch3\u003ePractical tips for installation and use\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003ePower down the main and verify absence of voltage before any work\u003c\/li\u003e \u003cli\u003eEnsure your panel is designed for bolt-on breakers in the QJ3B family and supports a 125A, 3-pole configuration\u003c\/li\u003e \u003cli\u003eInstall according to your panel’s instruction manual and follow standard electrical safety practices\u003c\/li\u003e \u003cli\u003eAfter mounting, verify proper alignment and that all mounting screws engage fully for secure operation\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eFor professionals upgrading or maintaining three‑phase 240V circuits, the Siemens \u003cstrong\u003eQJ3B125A02\u003c\/strong\u003e delivers reliable protection with exact-fit compatibility, helping systems stay safe and operational.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46427419082914,"sku":"QJ3B125A02","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-qj3b125a02-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}