{"product_id":"square-d-h366n-600a-3p-600v-safety-switch","title":"Square D H366N 600A 3P 600V Safety Switch, NEMA 1, Fusible | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eThe Square D H366N 600A 3P 600V Safety Switch is your dependable indoor disconnect for clean, reliable equipment isolation at the point of use. Built to handle daily electrical work, this NEMA 1 fusible switch pairs rugged construction with straightforward, field-ready protection—so your maintenance teams, panel builders, and spare inventory stay ready for service without guesswork.\u003c\/p\u003e \u003ch3\u003eWhy this safety switch stands out\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003e600A\u003c\/strong\u003e amperage rating across \u003cstrong\u003e3 poles\u003c\/strong\u003e for full 3-phase isolation, making it ideal for motors, feeders, and heavy equipment.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e600V\u003c\/strong\u003e maximum operating voltage with a robust, field-proven design that keeps circuits safely disconnected during servicing.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNEMA 1 enclosure\u003c\/strong\u003e optimized for indoor dry environments, delivering a compact, reliable solution in panels and equipment rooms.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFusible\u003c\/strong\u003e configuration for integrated overcurrent protection—simplifying wiring and improving safety during maintenance and fault conditions.\u003c\/li\u003e \u003cli\u003eDirect \u003cstrong\u003epart-number match\u003c\/strong\u003e for Square D assemblies, helping you minimize mis-orders and speed up commissioning or replacements.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003ePrime use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eEquipment disconnect at the point of use in manufacturing lines, packaging rooms, or industrial suites.\u003c\/li\u003e \u003cli\u003ePanel-building projects where a compatible, fusible disconnector is needed to meet wiring schematics and maintenance workflows.\u003c\/li\u003e \u003cli\u003eSpare inventory in maintenance reserves to ensure rapid replacements with a proven, factory-backed part.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhat problems it solves\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eFast, reliable isolation of machinery to protect technicians during servicing.\u003c\/li\u003e \u003cli\u003eIntegrated protection that reduces the number of separate components needed in a downstream safety circuit.\u003c\/li\u003e \u003cli\u003eClear, unambiguous compatibility with Square D systems, lowering the risk of mismatches in critical builds.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eHow it compares to alternatives\u003c\/h3\u003e\n\u003cp\u003eCompared with non-fusible disconnects, the H366N brings built-in overcurrent protection into a single enclosure, streamlining installation and improving fault response. Its NEMA 1 rating and fusible design provide a proven combination for indoor, dry environments where reliable isolation is non-negotiable.\u003c\/p\u003e \u003ch3\u003ePractical notes and best practices\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eEnsure the installation environment aligns with an indoor dry setting to preserve NEMA 1 enclosure effectiveness.\u003c\/li\u003e \u003cli\u003eUse with appropriately rated fuses to maintain intended protection and system coordination.\u003c\/li\u003e \u003cli\u003eConsult qualified electrical personnel for installation, wiring, and commissioning to maximize safety and performance.\u003c\/li\u003e \u003cli\u003eAmpState stocks the H366N, and our team can assist with compatibility checks to confirm a perfect fit for your panel or panel-building project.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eIf you’re looking for a dependable, part-number-aligned fusible safety switch that delivers clear isolation and robust protection for 3-phase 600V systems, the Square D H366N is a smart, purpose-built choice. Contact AmpState to verify fit, availability, and how this switch can slot into your electrical architecture with minimal hassle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"AmpState","offers":[{"title":"Default Title","offer_id":46411001757858,"sku":"H366N","price":19487.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/square-d-h366n-600a-3p-600v-safety-switch-nema-1-fusible-ampstate-422.webp?v=1789002050","url":"https:\/\/www.ampstate.com\/products\/square-d-h366n-600a-3p-600v-safety-switch","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}