{"product_id":"westinghouse-nb3900s-circuit-breaker","title":"Westinghouse | NB3900S | Circuit Breaker | 3-Pole | 600V | Bolt-On","description":"\u003cdiv\u003e\n\u003cp\u003eWestinghouse NB3900S Circuit Breaker is a robust 3-pole, 600V bolt-on protective device designed for reliability in demanding electrical environments. Whether you’re maintaining an existing installation, retrofitting a panel, or replacing a worn breaker, NB3900S delivers precise protection and straightforward serviceability.\u003c\/p\u003e \u003ch3\u003eKey specifications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003ePoles\u003c\/strong\u003e: 3-Pole\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage rating\u003c\/strong\u003e: 600V\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: NB3900S\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy choose NB3900S for your system\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eReliable three-phase protection: The 3-pole design provides balanced interruption across all three conductors in a three-phase circuit, minimizing voltage imbalances during faults.\u003c\/li\u003e \u003cli\u003eFast, bolt-on installation: The bolt-on format simplifies mounting to compatible panels, reducing downtime and enabling quicker service windows.\u003c\/li\u003e \u003cli\u003eClear compatibility path: The part number NB3900S is the best reference for ensuring you’re selecting the exact replacement for your panel or control system.\u003c\/li\u003e \u003cli\u003eVersatile use cases: Ideal for maintenance schedules, panel retrofits, and replacements in industrial and commercial power distribution where 600V operation is standard.\u003c\/li\u003e \u003cli\u003eDurable construction for long service life: Designed to withstand regular switching and fault events typical in demanding environments.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eUse cases and installation considerations\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eMaintenance and replacements in Westinghouse panels and other compatible switchgear that require a 3-pole, 600V bolt-on breaker.\u003c\/li\u003e \u003cli\u003eRetrofits where newer frame designs must match the existing bus and trip characteristics.\u003c\/li\u003e \u003cli\u003eBefore ordering, double-check fit and ratings against your panel labeling; NB3900S is the best compatibility reference.\u003c\/li\u003e \u003cli\u003eDuring installation, ensure the power is fully de-energized and follow all safety procedures per your site’s protocol.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWith Westinghouse NB3900S, you get a proven protective device that aligns with established electrical standards while offering straightforward serviceability. For a precise replacement that meets your three-phase, 600-volt needs, rely on the NB3900S part number as your definitive reference.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Westinghouse","offers":[{"title":"Default Title","offer_id":46427171324066,"sku":"NB3900S","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_a0994f42-7fad-49d1-911a-c2784022b8c9.png?v=1765492979","url":"https:\/\/www.ampstate.com\/products\/westinghouse-nb3900s-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}