{"product_id":"square-d-h321nrb-square-disconnect-switch","title":"Square D H321NRB-SQUARE - 30A, 240V, 3-Pole, Heavy Duty Fused Safety Switch","description":"\u003cdiv\u003e\n\u003cp\u003eThe Square D H321NRB-SQUARE is a Heavy Duty Fused Safety Switch engineered for industrial and commercial environments that demand safe, reliable electrical isolation. With a 30A, 240V rating across three poles, this switch delivers dependable disconnection under load while supporting proper lockout\/tagout procedures. Its NEMA 3R enclosure means it’s built to stand up to outdoor or harsh indoor settings, making maintenance and service safer and more efficient.\u003c\/p\u003e \u003ch3\u003eWhy this switch stands out\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003ePrecise three-pole protection\u003c\/strong\u003e: 30A, 240V configuration provides robust control for three-phase circuits, helping to isolate equipment quickly and safely when maintenance is required.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHeavy-duty fused design\u003c\/strong\u003e: Fuses cooperate with the switch to offer reliable overcurrent protection, reducing arc exposure and enabling a clear, controlled shutdown under fault or overload conditions.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOutdoor-ready enclosure\u003c\/strong\u003e: The NEMA 3R rating protects against rain, sleet, and incidental weather exposure, making it suitable for exterior panels, equipment pads, or entrances to outdoor electrical rooms.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eLockout\/Tagout friendly\u003c\/strong\u003e: Dedicated, accessible disconnect point supports safe energy isolation during servicing, aligning with workplace safety programs and regulatory requirements.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTrusted brand and model\u003c\/strong\u003e: Square D, a long-standing name in industrial electrical protection, combines durable construction with proven performance in demanding environments. Model H321NRB-SQUARE is designed for reliable, long-term operation.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eTechnical details at a glance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eAmperage rating: 30A\u003c\/li\u003e \u003cli\u003eVoltage rating: 240V\u003c\/li\u003e \u003cli\u003eNumber of poles: 3-Pole\u003c\/li\u003e \u003cli\u003eEnclosure: NEMA 3R\u003c\/li\u003e \u003cli\u003eProduct type: Heavy Duty Fused Safety Switch\u003c\/li\u003e \u003cli\u003eBrand: Square D\u003c\/li\u003e \u003cli\u003eModel: H321NRB-SQUARE\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eFeeding and isolating three-phase motors in manufacturing lines, conveyors, or presses where safe maintenance shutdowns are essential.\u003c\/li\u003e \u003cli\u003eOutdoor equipment protection and isolation for pumps, cooling systems, and HVAC subsystems exposed to weather.\u003c\/li\u003e \u003cli\u003eSite electrical rooms or exterior service panels requiring a clear, fuse-protected disconnect with reliable load interruption.\u003c\/li\u003e \u003cli\u003eLockout\/tagout compliance for routine servicing, ensuring workers can perform maintenance with confidence that equipment remains de-energized.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003ePractical setup and safety notes\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003ePlan for proper fuse sizing to match the connected load and ensure coordinated protection across the circuit.\u003c\/li\u003e \u003cli\u003eVerify installation by trained personnel to ensure correct alignment with three-phase circuits and lockout\/tagout procedures.\u003c\/li\u003e \u003cli\u003eUse as part of a broader safety strategy that includes visible disconnection points and clear labeling for quick identification during maintenance or emergencies.\u003c\/li\u003e \u003cli\u003eConsider the outdoor rating when routing cables and mounting location to maximize exposure protection and ease of service access.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eDesigned for reliability in demanding environments, the Square D H321NRB-SQUARE heavy-duty fused safety switch provides a precise, fuse-protected disconnect with a strong emphasis on safe maintenance practices. If you’re upgrading panel protection or installing a new isolation point for 3-phase equipment, this switch offers a durable, code-aligned solution that keeps your operations safer and more efficient.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp-State","offers":[{"title":"Default Title","offer_id":46383703163042,"sku":"H321NRB-SQUARE","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/disconnect_switches_generic_ee0d8de8-b42f-4faa-b411-f4502adfc51e.png?v=1765252312","url":"https:\/\/www.ampstate.com\/products\/square-d-h321nrb-square-disconnect-switch","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}