{"product_id":"na390-circuit-breaker","title":"NA390 | Circuit Breaker | 3-Pole | 240V","description":"\u003cdiv\u003e\n\u003cp\u003eNA390 | Circuit Breaker | 3-Pole | 240V — a rugged, industrial-grade overcurrent protector designed for three-phase power systems.\u003c\/p\u003e\n\u003cp\u003eIn busy industrial panels, reliability matters. The NA390 is a 3-pole circuit breaker built to shut down a three-phase circuit safely at 240V, protecting downstream equipment from overloads and short circuits. This unit is particularly well-suited for maintenance work, retrofit projects, and replacement scenarios where exact specifications are required to maintain system performance and safety.\u003c\/p\u003e \u003ch3\u003eKey advantages and features\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eThree-pole configuration provides balanced protection across all three phases in a typical 3-phase distribution\u003c\/li\u003e \u003cli\u003eNominal voltage rating of 240V aligns with standard industrial power systems\u003c\/li\u003e \u003cli\u003ePart number NA390 serves as the primary compatibility reference for matching equipment\u003c\/li\u003e \u003cli\u003eIntended for use in maintenance, retrofit, and replacement tasks where exact specs are critical\u003c\/li\u003e \u003cli\u003eCompact, durable construction designed for factory floors, control panels, and electrical enclosures\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eReplacing a failed breaker in three-phase panels without changing the panel architecture\u003c\/li\u003e \u003cli\u003eRetrofits where upgrading to a 3-pole 240V breaker is required to support upgraded equipment\u003c\/li\u003e \u003cli\u003eMaintenance planning with a known reference part number to minimize downtime\u003c\/li\u003e \u003cli\u003eSpare parts stocking for service fleets that manage 3-phase electrical systems\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eImportant ordering note:\u003c\/strong\u003e Confirm fit and ratings before ordering. The part number is the best reference for compatibility — use NA390 to verify against your panel schedule, discontinuation notices, and manufacturer specs.\u003c\/p\u003e \u003ch3\u003ePractical tips for installation and care\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eMatch the breaker footprint and mounting style to your existing panel or enclosure to ensure secure installation\u003c\/li\u003e \u003cli\u003eCheck electrical ratings on the panel label to confirm compatibility with 240V three-phase circuits\u003c\/li\u003e \u003cli\u003eKeep a labeled spare NA390 on hand for rapid service in critical equipment rooms\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"AmpState","offers":[{"title":"Default Title","offer_id":46426694811810,"sku":"NA390","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_16d3a2fb-5d93-424c-9206-5031ec4b178f.png?v=1765492977","url":"https:\/\/www.ampstate.com\/products\/na390-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}