{"product_id":"square-d-qmb366w-600a-600v-3-pole-panelboard-switch","title":"Square D QMB366W - 600A, 600V, 3-Pole Panelboard Switch \/ Switchboard Unit | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D QMB366W from AmpState—a robust 3-pole fusible panelboard switch engineered for dependable load switching in lighting and distribution panelboards. Built on Schneider Electric’s trusted QMB series, this unit delivers controlled isolation and coordinated protection when paired with the right upstream devices and fuse class, making it a reliable cornerstone for commercial and light-industrial electrical installations.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eWhy the QMB366W stands out\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eHigh-current, three-phase performance:\u003c\/strong\u003e With 600 A capacity at 600 V across three poles, it delivers consistent switching and protection across all phases, helping minimize voltage imbalances in larger panelboard layouts.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSpace-efficient fusible disconnect:\u003c\/strong\u003e Combines switching and fused protection in a single, compact unit tailored for panelboard environments, simplifying installation and maintenance workflows.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eEcosystem compatibility:\u003c\/strong\u003e Part of the Square D QMB family, ensuring seamless parts availability, accessories, and service within Schneider Electric’s ecosystem for ongoing reliability.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCoordinated protection when upstream is matched:\u003c\/strong\u003e Designed to work with appropriate upstream protection and fuse class, delivering proper overcurrent protection coordination and reducing nuisance trips to downstream equipment.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhat this means in practical terms\u003c\/h3\u003e \u003cp\u003eThe QMB366W is ideal when you need a dependable fusible disconnect within lighting and distribution panelboards. It’s especially valuable in mid-to-large commercial installations where a solid, three-pole disconnect with fused protection is required and where staying within the Schneider Electric family simplifies maintenance and spare parts management.\u003c\/p\u003e \u003ch3\u003eKey use cases\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eLighting panelboards in office, retail, or educational facilities that benefit from a controlled maintenance disconnect with fused protection.\u003c\/li\u003e \u003cli\u003eDistribution panelboards in mid-to-large commercial spaces needing robust 3-pole isolation and coordinated upstream protection.\u003c\/li\u003e \u003cli\u003ePanel upgrades or replacements within Schneider Electric ecosystems to preserve compatibility with existing breakers, fuses, and spare parts.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eCompatibility and installation tips\u003c\/h3\u003e \u003cul\u003e \u003cli\u003ePair the QMB366W with the appropriate upstream protection and fuse class to achieve the intended overcurrent protection coordination. This pairing is essential to prevent nuisance trips and to protect downstream equipment.\u003c\/li\u003e \u003cli\u003eConsult the QMB series documentation to confirm mounting and enclosure compatibility within your panelboard assembly, ensuring a clean, code-compliant installation.\u003c\/li\u003e \u003cli\u003eConsider stock planning for Schneider Electric components to maintain serviceability and parts availability across facilities.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eSpecs at a glance\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eAmperage: 600 A\u003c\/li\u003e \u003cli\u003eVoltage: 600 V\u003c\/li\u003e \u003cli\u003ePoles: 3\u003c\/li\u003e \u003cli\u003eSeries: QMB (Square D \/ Schneider Electric)\u003c\/li\u003e \u003cli\u003ePart number: QMB366W\u003c\/li\u003e \u003cli\u003eFunction: Fusible panelboard switch for reliable load switching and overcurrent protection when used with appropriate upstream protection and fuse class\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eDesigned with panel systems in mind, the QMB366W helps you consolidate switching and protection into a single, space-conscious device. By staying aligned with the Square D QMB family, it simplifies maintenance planning, spares stocking, and service continuity across facilities that rely on Schneider Electric components.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eWho benefits most\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eElectrical engineers and facility managers overseeing commercial or light-industrial buildings that require reliable, code-compliant fusible disconnects in panelboards.\u003c\/li\u003e \u003cli\u003e technicians performing panel upgrades or replacements who want seamless integration with existing Schneider Electric breakers, fuses, and spare parts.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eIn short, the QMB366W is not just a switch—it’s a thoughtfully engineered solution that aligns switching, protection, and system coordination in a single, dependable panelboard unit. When you need a durable, three-pole fusible disconnect that’s ready to integrate into a Schneider Electric ecosystem, the QMB366W delivers clarity, reliability, and long-term serviceability.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Schneider Electric \/ Square D","offers":[{"title":"Default Title","offer_id":46362094928034,"sku":"QMB366W","price":1110.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/panel_mount_switches_p1_a9ffb861-bf16-4fca-9568-5de64ad1f788.png?v=1764709855","url":"https:\/\/www.ampstate.com\/products\/square-d-qmb366w-600a-600v-3-pole-panelboard-switch","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}