{"product_id":"square-d-qmb321tw-30a-240v-3-phase-switch","title":"Square D QMB321TW - 30A, 240V, 3-Phase, Switch","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eSquare D QMB321TW\u003c\/strong\u003e is a rugged 30A, 240V, 3‑phase switch engineered for reliable on\/off isolation and overcurrent protection in demanding industrial and commercial environments.\u003c\/p\u003e\n\u003cp\u003eWith a compact, maintainable fusible design, the QMB321TW serves as a dedicated motor disconnect, a protective switch in panelboards, and a branch‑circuit protector where space and serviceability matter most.\u003c\/p\u003e \u003ch3\u003eKey capabilities\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003e3‑phase, 240V operation:\u003c\/strong\u003e optimized for three‑phase motor circuits and distribution systems.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e30A current rating:\u003c\/strong\u003e suitable for a wide range of drive motors and equipment without oversizing your protection.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCompact, maintainable design:\u003c\/strong\u003e easy access for inspection, fuse replacement, and servicing in tight electrical rooms.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIsolates circuits safely:\u003c\/strong\u003e provides a clear on\/off break to permit safe maintenance and servicing.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBuilt for industrial use:\u003c\/strong\u003e robust construction that stands up to the rigors of commercial and light industrial settings.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cp\u003eInstall the QMB321TW as a motor disconnect right at the equipment, as a main or branch switching point in panelboards, or in any 3‑phase distribution path where reliable isolation and protection are required. It’s the practical choice for facilities that run 3‑phase motors, conveyors, pumps, and fans.\u003c\/p\u003e \u003ch3\u003eWhy this matters\u003c\/h3\u003e\n\u003cp\u003eRather than generic switches, the QMB321TW combines a proven Square D engineering pedigree with a compact form factor and clear, maintainable protection. By providing both isolation and overcurrent protection in a single, serviceable unit, it reduces downtime during maintenance and simplifies circuit protection planning for your motor control centers.\u003c\/p\u003e \u003ch3\u003eInstallation and compatibility notes\u003c\/h3\u003e\n\u003cp\u003eDesigned to integrate with standard 3‑phase distribution setups, the QMB321TW should be wired in accordance with local codes and your protective device scheme. Pair this fusible switch with appropriate fusing and supporting equipment to ensure complete motor circuit protection. Always verify the voltage, amperage, and phase requirements of your motors before installation.\u003c\/p\u003e \u003cp\u003eEquip your facility with a dependable 3‑phase disconnect you can trust. The Square D QMB321TW delivers precise isolation, reliable protection, and straightforward maintenance for your critical motor loads.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp-State","offers":[{"title":"Default","offer_id":46390344417442,"sku":"QMB321TW","price":795.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/fusible_disconnect_generic_6b07243f-071d-49a4-b3e9-f497a87fb9f3.png?v=1765368618","url":"https:\/\/www.ampstate.com\/products\/square-d-qmb321tw-30a-240v-3-phase-switch","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}