{"product_id":"square-d-d321nrb-disconnect-switch-3","title":"Square D D321NRB - 30A, 240V, 3-Pole, Fused Disconnect Switch","description":"\u003cdiv\u003e\n\u003cp\u003eThe Square D D321NRB fused disconnect switch is engineered for demanding industrial and commercial environments where safe electrical isolation is non-negotiable. With a 30A, 240V, 3-pole configuration, this unit delivers dependable, three-phase disconnection when maintenance or servicing is required, helping protect personnel and equipment alike.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eThree-pole isolation\u003c\/strong\u003e guarantees all live lines disconnect together, minimizing arcing risk and streamlining interlock sequences in complex switchgear.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIntegrated fusing\u003c\/strong\u003e provides immediate overcurrent protection at the disconnect point, reducing the chance of damage to downstream equipment.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNEMA 3R enclosure\u003c\/strong\u003e offers rugged, weather-resistant protection suitable for outdoor installations and harsh environments without compromising safety or performance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eLockout\/Tagout readiness\u003c\/strong\u003e supports compliant, visible safety practices, making maintenance procedures clearer and safer for teams.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDurable, field-ready design\u003c\/strong\u003e is built to withstand frequent operation and long service life in demanding settings.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhy this design matters in real-world use\u003c\/p\u003e \u003cul\u003e \u003cli\u003eIt provides a reliable isolation point for large motors, pumps, conveyors, and HVAC equipment, enabling safe servicing and maintenance with confidence.\u003c\/li\u003e \u003cli\u003eBy combining disconnection with overcurrent protection in a single unit, it simplifies wiring and reduces the footprint in control panels.\u003c\/li\u003e \u003cli\u003eThe weather-resistant enclosure maintains consistent performance whether installed indoors, on loading docks, or in outdoor equipment housings.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eIdeal use cases\u003c\/p\u003e \u003cul\u003e \u003cli\u003eFactories and warehouses with 3-phase motors and machinery that require regular maintenance.\u003c\/li\u003e \u003cli\u003eOutdoor equipment housings, pumping stations, and outdoor HVAC installations needing a rugged disconnect solution.\u003c\/li\u003e \u003cli\u003eMaintenance planning for production lines where a clear, safe, and compliant isolation point is essential.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eSpecification highlights\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Square D\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e D321NRB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Fused Disconnect Switch\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage Rating:\u003c\/strong\u003e 30A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage Rating:\u003c\/strong\u003e 240V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 3-Pole\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eEnclosure Rating:\u003c\/strong\u003e NEMA 3R\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eIn short, the Square D D321NRB fused disconnect switch offers precise, safe, and durable electrical isolation for three-phase systems, backed by a robust enclosure and lockout-ready design that keep maintenance crews protected and productivity on track.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp-State","offers":[{"title":"Default Title","offer_id":46383751299234,"sku":"D321NRB","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/disconnect_switches_generic_39f1a046-9fa8-46c8-baad-211c496d7446.png?v=1765253445","url":"https:\/\/www.ampstate.com\/products\/square-d-d321nrb-disconnect-switch-3","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}