{"product_id":"siemens-cj3b125-circuit-breaker","title":"Siemens | CJ3B125 | Circuit Breaker | 125A | 3-Pole | Bolt-On","description":"\u003cdiv\u003e\n\u003cp\u003eSiemens CJ3B125 is a robust 125A, 3-pole circuit breaker designed to shield your electrical panel from overcurrent events. This bolt-on unit is ideal for maintenance, retrofit, and replacement projects where precise compatibility and reliable protection matter most.\u003c\/p\u003e \u003cp\u003eDesigned for straightforward installation in compatible Siemens panels, the CJ3B125 uses a bolt-on mounting to deliver a secure, vibration-resistant connection. By choosing the CJ3B125, you align with Siemens’ proven protection technology and streamlined serviceability for ongoing operations.\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\u003eMounting:\u003c\/strong\u003e Bolt-On\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e CJ3B125\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhat makes this breaker stand out\u003c\/h3\u003e\n\u003cp\u003eUnlike generic replacements, the CJ3B125 is a purpose-built Siemens component designed to fit precisely in systems that expect the CJ3B family form factor. The bolt-on design provides a strong mechanical bond, reducing micro-movements that can compromise protection in vibration-prone environments. The 3-pole configuration gives you reliable three-phase protection with coordinated interrupt capability, which is critical in motor drives, distribution panels, and process controls.\u003c\/p\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eMaintenance: quick, reliable swap for aging or worn-out breakers in existing panels.\u003c\/li\u003e \u003cli\u003eRetrofit: upgrade protection in aging installations to meet current safety standards.\u003c\/li\u003e \u003cli\u003eReplacement: a direct reference for compatibility when a CJ3B125 is required for service or spare parts.\u003c\/li\u003e \u003cli\u003ePanel modernization: integrate with Siemens control ecosystems where standardized CJ3B-series devices are deployed.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eCompatibility and installation notes\u003c\/h3\u003e\n\u003cp\u003eAlways confirm fit and ratings before ordering. The CJ3B125 is the best reference for compatibility with Siemens bolt-on panels designed for CJ3B series devices. Before installation, verify that your panel supports bolt-on breakers of this rating and that the overall system protection matches your load profile. If replacing an existing CJ3B125, this part number ensures the closest match in dimensions, trip characteristics, and mounting footprint.\u003c\/p\u003e \u003ch3\u003ePractical tips for optimal performance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eKeep spares on hand: CJ3B125 units ensure quick, downtime-minimizing replacements.\u003c\/li\u003e \u003cli\u003eInspect associated bus bar connections during replacement to prevent loose-termination risks.\u003c\/li\u003e \u003cli\u003eStore breakers in a clean, dry environment to preserve mechanical integrity for bolt-on mounting.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46424798036130,"sku":"CJ3B125","price":310.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_a085eff1-75dd-47ee-b131-4c8df8f0489b.png?v=1765492976","url":"https:\/\/www.ampstate.com\/products\/siemens-cj3b125-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}