{"product_id":"westinghouse-nby3900-circuit-breaker","title":"Westinghouse | NBY3900 | Circuit Breaker | 900A | 3-Pole | 600V | Bolt-On","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eWestinghouse NBY3900 Circuit Breaker\u003c\/strong\u003e is a rugged bolt-on, 3-pole protection device engineered for high-demand electrical systems. With a 900 A current rating and 600 V maximum, it delivers reliable interruption and safe isolation of large loads in industrial or commercial panels. Identified by the part number NBY3900, this breaker is designed for maintenance, retrofit, and replacement projects where exact specifications are required.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 900 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3-Pole\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 600 V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Bolt-On\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eReference:\u003c\/strong\u003e Part number NBY3900 (best reference for compatibility)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRecommended use:\u003c\/strong\u003e Maintenance, retrofit, and replacement where matching specs are required\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhy this Westinghouse circuit breaker stands out: its 900 A rating handles substantial electrical loads, while the 3-pole configuration supports balanced protection across multi-phase circuits. The bolt-on mounting enables secure, straightforward installation in compatible panels, making it a practical choice for both upgrading legacy systems and ensuring continued reliability in demanding environments.\u003c\/p\u003e \u003cp\u003eKey compatibility and installation notes to guide your purchase: always confirm fit and ratings before ordering, and treat the NBY3900 as the best reference for compatibility with your panel or distribution board. For installers and facility managers, this part helps minimize downtime by aligning with existing specifications and mounting requirements.\u003c\/p\u003e \u003cp\u003eIdeal scenarios include service panels and distribution gear that require a high-current, bolt-on, 3-pole solution at 600 V. Use this breaker for strategic maintenance windows, panel retrofits, or replacement cycles where exact spec alignment with the NBY3900 series is essential.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Westinghouse","offers":[{"title":"Default Title","offer_id":46427170930850,"sku":"NBY3900","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-nby3900-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}