{"product_id":"square-d-9050fsr4-400a-3p-600v-circuit-breaker","title":"Square D 9050FSR4 Circuit Breaker, 400A, 3-Pole, 600V","description":"\u003cdiv\u003e\n\u003cp\u003eWhen industrial power stability matters, the Square D 9050FSR4 circuit breaker delivers dependable 3‑phase protection for demanding environments. Rated at 400 A and designed for 600 V systems, this 3-pole unit fits into heavy-duty electrical service panels used in manufacturing, facilities, and maintenance operations. Use the part number 9050FSR4 to verify compatibility with your application and panel family.\u003c\/p\u003e \u003cp\u003eWhat makes the 9050FSR4 stand out:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eHigh-current, three-pole protection:\u003c\/strong\u003e 400 A capacity with a 3-pole configuration supports balanced three-phase loads and synchronized switching.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e600-volt compatibility:\u003c\/strong\u003e Engineered for standard industrial distribution networks common in production lines, warehouses, and equipment rooms.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTrusted Square D build:\u003c\/strong\u003e A legacy of reliability in critical electrical protection, designed for service, maintenance, and replacement projects.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart-number dependent compatibility:\u003c\/strong\u003e Ensure fit by confirming the exact part number against your panel and application requirements; this reduces downtime and ensures proper trip characteristics.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eIdeal use cases:\u003c\/p\u003e \u003cul\u003e \u003cli\u003eIndustrial service upgrades: replace aging breakers with a compatible 9050FSR4 to maintain protection levels for high-current circuits.\u003c\/li\u003e \u003cli\u003eMaintenance and downtime planning: carry a compatible spare to minimize panel outages during routine servicing.\u003c\/li\u003e \u003cli\u003eNew installations in 600 V, three-phase systems where reliable disconnection and protection are essential.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eHow to confirm compatibility:\u003c\/p\u003e \u003cul\u003e \u003cli\u003eCross-check the part number: 9050FSR4 against your equipment's documentation and panel specification.\u003c\/li\u003e \u003cli\u003eMatch amperage (400 A), number of poles (3), and voltage rating (600 V) to your circuit design and protection requirements.\u003c\/li\u003e \u003cli\u003eIf you’re unsure, send us a message with your application details and we’ll help verify fit and alternatives.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eReady to secure your electrical system with a proven Square D solution? Check the 9050FSR4’s compatibility for your specific panel and project—then reach out for expert guidance to ensure seamless integration into your maintenance or upgrade plan.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"AmpState","offers":[{"title":"Default Title","offer_id":46414722367650,"sku":"9050FSR4","price":460.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_513d6710-3734-4b27-839d-f68e6f4b470a.png?v=1765492974","url":"https:\/\/www.ampstate.com\/products\/square-d-9050fsr4-400a-3p-600v-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}