{"product_id":"square-d-qob390-90a-240v-3-pole-bolt-on-circuit-breaker","title":"Square D QOB390 - 90 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D QOB390 — a 90 A, 240 V, 3-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built for consistent performance in residential, commercial, and light industrial environments, it combines robust mounting with precise protection.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e for a rigid, vibration-resistant bus connection that stays aligned under demanding conditions.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e provides stable, repeatable protection across a wide range of fault scenarios, reducing nuisance trips and preserving downstream circuitry.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e3-pole design\u003c\/strong\u003e ensures balanced protection and coordinated tripping across all phases for shared loads and multi-wire circuits.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e90 A, 240 V rating\u003c\/strong\u003e targets branch circuits that demand higher protection without compromising system accessibility or expandability.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM compatibility\u003c\/strong\u003e with matching Square D panels and load centers, helping maintain performance, reliability, and ease of replacement.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eTechnical snapshot\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eManufacturer: \u003cstrong\u003eSquare D\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003ePart Number: \u003cstrong\u003eQOB390\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eType: \u003cstrong\u003eThermal-magnetic molded case circuit breaker\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eAmperage Rating: \u003cstrong\u003e90 A\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eVoltage Rating: \u003cstrong\u003e240 V\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eNumber of Poles: \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eMounting Style: \u003cstrong\u003eBolt-on\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eIdeal applications\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eProtection for branch circuits in residential, commercial, and light industrial panelboards and load centers.\u003c\/li\u003e \u003cli\u003eUpgrading or replacing aging breakers where a secure, vibration-resistant connection is critical.\u003c\/li\u003e \u003cli\u003eSystems where consistent thermal-magnetic protection minimizes nuisance trips during startup surges or varying load conditions.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eWhy this breaker stands out\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eDurable bolt-on mounting reduces movement and wear in environments with vibration or mechanical stress.\u003c\/li\u003e \u003cli\u003eThermal-magnetic trip provides reliable coordination between overload protection and short-circuit protection, helping protect both equipment and occupants.\u003c\/li\u003e \u003cli\u003eOEM compatibility means straightforward installation in compatible panels, preserving the intended electrical performance and simplifying maintenance.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eIf you’re designing or retrofitting a panel system, the Square D QOB390 delivers the rugged, reliable protection you need for demanding 90 A circuits. It’s a practical choice for technicians seeking a proven, easy-to-integrate solution that aligns with Square D panelboards and load centers while delivering care-free operation in everyday use.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355421659298,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/schnieder_and_square_d_breaker_and_panel_d22d65ca-83ce-4fef-94ae-490bace55462.png?v=1764692004","url":"https:\/\/www.ampstate.com\/products\/square-d-qob390-90a-240v-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}