{"product_id":"siemens-mbknb3-circuit-breaker","title":"Siemens | MBKNB3 | Circuit Breaker | 125A","description":"\u003cdiv\u003e\n\u003cp\u003eProtect your electrical system with the Siemens MBKNB3 125A circuit breaker — a purpose-built solution for reliable overcurrent protection in maintenance, retrofit, and replacement projects. Designed to align with Siemens panel configurations, this breaker helps you restore safe, continuous power quickly when spec-matching is essential.\u003c\/p\u003e \u003ch3\u003eKey details\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eAmperage: 125A\u003c\/li\u003e \u003cli\u003ePart number: MBKNB3\u003c\/li\u003e \u003cli\u003eApplication: ideal for maintenance, retrofit, and replacement where exact specifications are required\u003c\/li\u003e \u003cli\u003eCompatibility note: confirm fit and ratings before ordering; the MBKNB3 part number is the best reference for compatibility\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy choose the MBKNB3 for your Siemens setup?\u003c\/h3\u003e\n\u003cp\u003eThis 125A circuit breaker is engineered for dependable protection in electrical panels that rely on Siemens’ MBK family. By choosing the MBKNB3, you gain a precise, plug-in solution that minimizes downtime during upgrades or service intervals, while maintaining the protective characteristics your system expects. Its clear part-number reference streamlines ordering and reduces guesswork in retrofit scenarios.\u003c\/p\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eMaintenance projects where you need a direct, compatible replacement\u003c\/li\u003e \u003cli\u003eRetrofit upgrades that require exact amperage and form factor to preserve panel logic\u003c\/li\u003e \u003cli\u003eReplacement of aging or worn breakers in Siemens-compatible panels\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eHow to verify compatibility\u003c\/h3\u003e\n\u003col\u003e \u003cli\u003eIdentify your panel model and the existing protection device to ensure the MBKNB3 matches in form factor and mounting style.\u003c\/li\u003e \u003cli\u003eCompare the amperage rating (125A) to your circuit’s protective requirements.\u003c\/li\u003e \u003cli\u003eUse the MBKNB3 part number as the definitive reference when cross-checking documentation or supplier catalogs.\u003c\/li\u003e\n\u003c\/ol\u003e \u003ch3\u003eWhat you’ll get\u003c\/h3\u003e\n\u003cp\u003eThe Siemens MBKNB3 is a 125A circuit breaker designed for dependable protection and straightforward replacement within compatible Siemens electrical systems. When exact specifications matter, this model offers a reliable path to restoring circuit integrity with minimal guesswork.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46426809761954,"sku":"MBKNB3","price":5632.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens-mbknb3-circuit-breaker-125a-921.webp?v=1789626054","url":"https:\/\/www.ampstate.com\/products\/siemens-mbknb3-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}