{"product_id":"square-d-qo390vh","title":"Square D QO390VH 90A 3-Pole 390 V Circuit Breaker","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D QO390VH 90A 3-Pole 390 V Circuit Breaker — a trusted, OEM solution built to protect three-phase power systems with precision and reliability. This model is identified by Part Number QO390VH and is designed to seamlessly integrate into Square D’s QO-series panels where robust, consistent performance matters.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eCurrent rating:\u003c\/strong\u003e 90 A — capable of handling sizable three-phase loads while providing dependable protection against overloads.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3 — disconnects all hot conductors in a three-phase circuit, enhancing safety and ensuring coordinated shutdown of power in fault conditions.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage rating:\u003c\/strong\u003e 390 V — suitable for distribution systems operating in the 380–400 V range, delivering reliable protection for mid-to-large scale applications.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSeries compatibility:\u003c\/strong\u003e Square D QO family — designed for plug-in compatibility with compatible QO panels and enclosures, enabling straightforward installation and dependable performance within established electrical infrastructure.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApplication scope:\u003c\/strong\u003e Ideal for commercial and light industrial environments where three‑phase power is used to run motors, pumps, conveyors, HVAC, and other equipment up to 390 V.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eThis model stands out for buyers seeking authentic Square D protection in a 3-pole, 90-amp form factor that fits standard QO panelboards. The QO390VH delivers predictable trip behavior and durable construction suitable for demanding installations, helping to minimize downtime and safeguard critical equipment.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eUse cases and scenarios\u003c\/strong\u003e: Deploy in three-phase distribution feeders, motor control centers, or main distribution panels where a single protective device must reliably monitor multiple hot legs. Perfect for facilities upgrading from lower-capacity breakers or consolidating protection across a 3-phase circuit running up to 390 V.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eWho this is for\u003c\/strong\u003e: Electrical professionals and facility managers who need a genuine Square D solution that matches existing QO panels and supports safe, compliant protection for 3-phase systems in commercial or light industrial settings.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eWhy choose this model\u003c\/strong\u003e: It pairs Square D’s proven engineering with a precise 90 A, 3-pole, 390 V specification, delivering consistent protection for mid-to-large loads while maintaining compatibility with the QO lineup for easy expansion or panel upgrades.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Square D","offers":[{"title":"Default Title","offer_id":46423149936802,"sku":"QO390VH","price":847.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_229276d9-908d-46df-93e5-6fe31866e0ff.png?v=1765492975","url":"https:\/\/www.ampstate.com\/products\/square-d-qo390vh","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}