{"product_id":"siemens-nr421-30a-240v-disconnect-switch-nema-3r","title":"Siemens NR421 - 30A, 240V, Disconnect Switch, NEMA 3R","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Siemens NR421 — a rugged \u003cstrong\u003e30A, 240V\u003c\/strong\u003e disconnect switch engineered for reliable on\/off isolation and precise overcurrent protection in demanding industrial and commercial settings. Built with a \u003cstrong\u003eNEMA 3R\u003c\/strong\u003e enclosure, this unit is ready to perform where weather, dust, and moisture are factors, so you can trust dependable operation day in and day out.\u003c\/p\u003e \u003cp\u003eDesigned for practical, maintenance-friendly service, the NR421 is a compact, \u003cstrong\u003efuse-protected disconnect switch\u003c\/strong\u003e that makes motor control, panelboard integration, and branch circuit protection straightforward. Its robust construction supports quick, safe disconnections for servicing, resets, or emergency shutdowns, while preserving long-term reliability in challenging environments.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eElectrical rating:\u003c\/strong\u003e 30A, 240V — suitable for a wide range of motor loads and branch circuits.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eEnclosure:\u003c\/strong\u003e NEMA 3R — weather-resistant for outdoor or protected indoor installations.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApplication focus:\u003c\/strong\u003e ideal for motor disconnects, panelboards, and branch circuit protection where a compact, maintainable fusible switch is required.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaintenance-oriented design:\u003c\/strong\u003e straightforward access for fuse replacement and periodic service, reducing downtime.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this matters for you\u003c\/h3\u003e\n\u003cp\u003eIn environments where reliability and quick isolation are non-negotiable, the NR421 delivers. The combination of \u003cstrong\u003eSiemens engineering\u003c\/strong\u003e and a \u003cstrong\u003e3R-rated enclosure\u003c\/strong\u003e means you can deploy this disconnect in exposed locations without compromising safety or performance. Its compact footprint helps fit into crowded panel spaces, while its maintainable fuse configuration simplifies routine servicing, minimizing downtime during repairs or upgrades.\u003c\/p\u003e \u003ch3\u003ePractical use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eMotor control centers and industrial drives where a clear, mandated disconnection point is required for safety and serviceability.\u003c\/li\u003e \u003cli\u003eOutdoor or semi-exposed electrical installations in manufacturing, facilities, or commercial buildings needing reliable branch circuit protection.\u003c\/li\u003e \u003cli\u003eQuick-pass protection for distribution panels, pump systems, conveyors, and small- to mid-size machinery fleets.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eTechnical snapshot\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\u003cstrongmodel:\u003e NR421\u003c\/strongmodel:\u003e\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\u003eNEMA rating:\u003c\/strong\u003e 3R\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Amp-State","offers":[{"title":"Default","offer_id":46390354215074,"sku":"NR421","price":411.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/fusible_disconnect_generic_8d4f6f8d-1732-4f5d-bc6f-6209d845d551.png?v=1765368905","url":"https:\/\/www.ampstate.com\/products\/siemens-nr421-30a-240v-disconnect-switch-nema-3r","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}