{"product_id":"square-d-d321n-30a-240v-3-pole-general-duty-fusible-safety-switch-nema-1","title":"Square D D321N - 30A, 240V, 3-Pole, General-Duty, Fusible, Safety Switch, NEMA 1","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eSquare D D321N - 30A, 240V, 3-Pole, General-Duty, Fusible, Safety Switch, NEMA 1\u003c\/strong\u003e is a rugged safety device designed for reliable on\/off isolation and overcurrent protection in demanding industrial and commercial environments. Built to handle daily switching cycles, this fusible switch combines protection and control in a compact, maintainable package that’s ready to go in motor disconnects, panelboards, and branch circuits.\u003c\/p\u003e \u003cp\u003eDesigned for indoor, general-duty use, the NEMA 1 enclosure shields sensitive electrical components from dust and debris while keeping the power path clearly isolated when service or maintenance is required. The 3-pole configuration ensures balanced control across all phases, making it a straightforward choice for three-phase equipment and motors up to 30A at 240V.\u003c\/p\u003e \u003ch3\u003eWhy choose the D321N for your installation\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eIntegrated protection and isolation:\u003c\/strong\u003e Safe, code-compliant motor disconnect with built-in fusible protection to guard against overcurrent events.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCompact, maintainable design:\u003c\/strong\u003e The enclosure and fuse-accessible design simplify maintenance, fuse replacement, and routine inspections—reducing downtime.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIndoor reliability:\u003c\/strong\u003e NEMA 1 enclosure delivers dependable protection in standard indoor environments such as equipment rooms, control panels, and factory floors.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThree-phase readiness:\u003c\/strong\u003e Three poles provide synchronized control for 240V three-phase loads, supporting motors, conveyors, pumps, and HVAC equipment.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eKey specifications at a glance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e D321N\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 30A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 240V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3-Pole\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNEMA Rating:\u003c\/strong\u003e NEMA 1\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDuty:\u003c\/strong\u003e General\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFused:\u003c\/strong\u003e Fusible\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eMotor disconnects for small to mid-size industrial equipment\u003c\/li\u003e \u003cli\u003ePanelboards requiring branch-circuit protection in indoor settings\u003c\/li\u003e \u003cli\u003eIndoor control cabinets, HVAC equipment, pumps, and conveyors that benefit from quick, reliable fusing\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003ePractical tips for installation and operation\u003c\/h3\u003e\n\u003cp\u003ePlan for 30A, 240V three-phase service and ensure compatible fuse types are used with the D321N. Keep the enclosure accessible for safe operation and routine maintenance. Regularly check fuse integrity, tighten terminations to spec, and inspect the NEMA 1 seals to maintain dust protection. This switch is designed to simplify wiring in new builds or retrofits where a dependable, compact fusible disconnect is preferred over non-fused alternatives.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp-State","offers":[{"title":"Default","offer_id":46390406676642,"sku":"D321N","price":457.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/fusible_disconnect_generic_fde03bc7-4e7b-47af-b7f8-5b3e3ea6d734.png?v=1765370414","url":"https:\/\/www.ampstate.com\/products\/square-d-d321n-30a-240v-3-pole-general-duty-fusible-safety-switch-nema-1","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}