{"product_id":"square-d-mef436lsig-circuit-breaker","title":"Square D | MEF436LSIG | Circuit Breaker | 400A | 600V","description":"\u003cdiv\u003e\n\u003cp\u003eMeet Square D MEF436LSIG, a purpose-built circuit breaker engineered for high‑demand electrical systems. With a 400A rating and a 600V maximum, this unit delivers reliable overcurrent protection for large feeders, service entrances, or branch circuits in industrial environments. It's designed for maintenance, retrofit, and replacement work where exact specs matter, ensuring you can keep critical equipment running smoothly.\u003c\/p\u003e \u003ch3\u003eWhat makes it work for you\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003ePrecise amperage and voltage ratings:\u003c\/strong\u003e 400A at up to 600V, sized for heavy‑duty circuits that require dependable protection.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eExact part‑number reference for compatibility:\u003c\/strong\u003e Use \u003cem\u003eMEF436LSIG\u003c\/em\u003e as the best reference to match with existing Square D installations and enclosures.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFlexible installation paths:\u003c\/strong\u003e Suitable for retrofit projects, maintenance outages, or replacing worn‑out breakers without extensive panel modification.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy customers choose this for their facilities\u003c\/h3\u003e\n\u003cp\u003eWhether you're upgrading an aging distribution panel, expanding capacity for a new line, or replacing a failed breaker, the MEF436LSIG provides dependable performance with minimal downtime. It’s designed to slot into Square D systems that rely on the MEF family for consistent trip characteristics and coordination with other protective devices.\u003c\/p\u003e \u003ch3\u003eUse cases and ideal environments\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eIndustrial plants with high‑current feeders and critical loads\u003c\/li\u003e \u003cli\u003eMaintenance windows where a direct, compatible replacement is required\u003c\/li\u003e \u003cli\u003eRetrofits where upgrading to higher protection is part of a broader electrical modernization\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003ePractical guidance\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Before ordering, confirm fit and ratings using the exact part number. The MEF436LSIG is the best reference for compatibility with your Square D gear. If you’re unsure, consult your electrical diagrams or a licensed electrician to verify that 400A and 600V ratings align with your system’s needs.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Square D","offers":[{"title":"Default Title","offer_id":46426345242786,"sku":"MEF436LSIG","price":2010.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_a085eff1-75dd-47ee-b131-4c8df8f0489b.png?v=1765492976","url":"https:\/\/www.ampstate.com\/products\/square-d-mef436lsig-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}