{"product_id":"westinghouse-nby3900s-circuit-breaker","title":"Westinghouse | NBY3900S | Circuit Breaker | 3-Pole | Bolt-On","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Westinghouse NBY3900S, a dedicated 3-pole circuit breaker with a bolt-on mounting design built for demanding maintenance, retrofit, and replacement projects. When you need dependable overcurrent protection that aligns precisely with your panel’s specifications, this unit delivers a secure, straightforward swap in compatible systems.\u003c\/p\u003e \u003cul\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 reference:\u003c\/strong\u003e NBY3900S — the best compatibility reference for matching specs\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBest use cases:\u003c\/strong\u003e maintenance, retrofit, and replacement in suitable panels\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eImportant note:\u003c\/strong\u003e Confirm fit and ratings before ordering to ensure seamless integration\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this 3-pole bolt-on breaker stands out\u003c\/h3\u003e\n\u003cp\u003eDesigned for reliable, durable operation in electrical panels that require a precise 3-pole configuration, the Westinghouse NBY3900S offers secure bolt-on mounting for a solid electrical connection. Its compatibility hinges on matching the exact part number, which simplifies sourcing and reduces the risk of mismatched components during retrofit or replacement projects.\u003c\/p\u003e \u003ch3\u003eIdeal scenarios and who should consider it\u003c\/h3\u003e\n\u003cp\u003eThis breaker is particularly well-suited for facilities technicians, electrical contractors, and maintenance teams working on older or updating electrical service panels that specify a 3-pole bolt-on solution. Use cases include:\u003c\/p\u003e \u003cul\u003e \u003cli\u003eRetrofit projects where older panels need a like-for-like replacement to restore overcurrent protection\u003c\/li\u003e \u003cli\u003eMaintenance cycles that require swapping out worn breakers without altering panel hardware\u003c\/li\u003e \u003cli\u003eReplacement tasks where the part number NBY3900S is identified as the exact compatibility reference\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eHow to ensure a perfect fit\u003c\/h3\u003e\n\u003cp\u003eBefore purchasing, verify:\u003c\/p\u003e \u003cul\u003e \u003cli\u003eThe panel requires a 3-pole configuration and a bolt-on mounting style\u003c\/li\u003e \u003cli\u003eThe electrical ratings (voltage, current, and interrupting capacity) match your system’s specifications\u003c\/li\u003e \u003cli\u003eThe panel label or service manual references the NBY3900S part number as the compatible replacement\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003ePractical tips for installation and maintenance\u003c\/h3\u003e\n\u003cp\u003ePrepare for a smooth swap by ensuring the system is de-energized, following all safety protocols, and keeping the existing bus connections clean and free of corrosion. Since exact fit is critical, use the NBY3900S part number as your primary compatibility check during ordering, and consult your panel manufacturer’s documentation if you’re moving from a different pole count or mounting style.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Westinghouse","offers":[{"title":"Default Title","offer_id":46427170898082,"sku":"NBY3900S","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/westinghouse-nby3900s-circuit-breaker-3-pole-bolt-391.webp?v=1789676845","url":"https:\/\/www.ampstate.com\/products\/westinghouse-nby3900s-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}