{"product_id":"square-d-qmb-364-200a-600v-3-pole-fusible-switch","title":"Square D QMB-364 - 200A, 600V, 3-Pole, Fusible, Switch","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eSquare D QMB-364\u003c\/strong\u003e is a rugged, reliable fusible switch engineered for on\/off isolation and robust overcurrent protection in demanding industrial and commercial environments. With a 200A rating and a 600V maximum, this 3-pole device is purpose-built for medium-duty motor disconnects, panelboards, and branch circuits where dependable protection and simple maintenance matter most.\u003c\/p\u003e \u003ch3\u003eWhy this fusible switch stands out\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eIntegrated protection and control\u003c\/strong\u003e — combines switching capability with fusible protection, giving you quick isolation and clear fault interruption in a single, compact package.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThree-phase reliability\u003c\/strong\u003e — 3-pole design ensures all three phases disconnect together, preventing half-bridging scenarios that can harm equipment and compromise safety.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHigh-current, high-voltage readiness\u003c\/strong\u003e — rated for \u003cstrong\u003e200A\u003c\/strong\u003e at up to \u003cstrong\u003e600V\u003c\/strong\u003e, making it suitable for a wide range of motors, transformers, and distribution circuits.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaintenance-friendly by design\u003c\/strong\u003e — a compact form factor with accessible fuse components simplifies routine checks and fuse replacement, reducing downtime during service windows.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIndustrial-grade robustness\u003c\/strong\u003e — built to endure the realities of busy facilities, from rugged environments to demanding operating cycles, while delivering reliable isolation when needed.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eKey specifications at a glance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eModel: QMB-364\u003c\/li\u003e \u003cli\u003eAmperage: 200A\u003c\/li\u003e \u003cli\u003eVoltage: 600V\u003c\/li\u003e \u003cli\u003ePoles: 3-Pole\u003c\/li\u003e \u003cli\u003eFusible: Fusible switch for integrated protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cp\u003ePerfect for motor disconnects where you need both a switch and fuse in one unit, \u003cem\u003epanelboards\u003c\/em\u003e requiring localized protection, and \u003cem\u003ebranch circuit protection\u003c\/em\u003e in commercial or light-industrial applications. If you’re upgrading from a plain disconnect, the QMB-364 delivers enhanced safety and faster fault response without expanding your control cabinet footprint.\u003c\/p\u003e \u003ch3\u003eHow it protects your system\u003c\/h3\u003e\n\u003cp\u003eThe fusible element provides overcurrent protection, cutting power quickly when a fault is detected. The 3-pole design guarantees synchronized disconnection of all phases, helping prevent voltage imbalances and protecting downstream equipment from damage. This setup simplifies code compliance for protective routing while keeping maintenance straightforward.\u003c\/p\u003e \u003ch3\u003ePractical tips for best results\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003ePair this switch with appropriately rated fuses to maintain the intended protection level and ensure violation-free code compliance.\u003c\/li\u003e \u003cli\u003eUse in appropriate panel enclosures where clear visibility and safe access for maintenance are available.\u003c\/li\u003e \u003cli\u003eSchedule regular fuse inspections and replace any damaged or degraded fuses promptly to maintain reliable protection margins.\u003c\/li\u003e \u003cli\u003eWhen selecting a disconnect for a motor load, consider the QMB-364 for its compact footprint without sacrificing protection or serviceability.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWho this is for\u003c\/h3\u003e\n\u003cp\u003eFacilities managers, electrical contractors, and plant engineers seeking a durable, easy-to-maintain fusible switch for motor control centers, switchgear enclosures, and protected branch circuits will appreciate the Square D QMB-364’s balance of performance and practicality.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp-State","offers":[{"title":"Default","offer_id":46390360801442,"sku":"QMB-364","price":882.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/square-d-qmb-364-200a-600v-3-pole-fusible-switch-341.webp?v=1788866941","url":"https:\/\/www.ampstate.com\/products\/square-d-qmb-364-200a-600v-3-pole-fusible-switch","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}