{"product_id":"square-d-q1b390-90a-3p-240v-circuit-breaker","title":"Square D Q1B390 Circuit Breaker, 90A, 3-Pole, 240V","description":"\u003cdiv\u003e\n\u003cp\u003eIntroducing the Square D Q1B390 circuit breaker — a rugged, reliable solution built for industrial electrical service, maintenance, and replacement projects. With a 90 Amp rating, three poles, and 240V operation, this breaker is purpose-built to safeguard demanding three‑phase circuits in commercial and industrial environments. Verify compatibility using the part number Q1B390 and your panel’s application requirements.\u003c\/p\u003e \u003ch2\u003eKey specifications\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Square D\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e Q1B390\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eProduct type:\u003c\/strong\u003e Circuit Breaker\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 90 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 240V\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhy this breaker stands out\u003c\/h2\u003e\n\u003cp\u003eThe Q1B390 is designed for industrial service scenarios where dependable protection and robust performance are non-negotiable. Its 3-pole design is ideal for 3-phase systems, providing coordinated interruption across all phases to help prevent equipment damage and downtime. Manufactured by Square D, it integrates with existing Square D panels and distribution setups, offering a cohesive, reliable protection solution for mid-to-large load circuits.\u003c\/p\u003e \u003ch2\u003eIdeal use cases\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eIndustrial service upgrades and panel replacements in manufacturing facilities\u003c\/li\u003e \u003cli\u003eMaintenance projects requiring a dependable 90 A, 3-pole, 240V circuit breaker\u003c\/li\u003e \u003cli\u003eReplacement of worn or outdated breakers in heavy-duty electrical distributions\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eCompatibility and purchasing guidance\u003c\/h2\u003e\n\u003cp\u003eNotes: Verify fit by part number and application requirements. If you’re unsure about compatibility, you’re not alone — we’re here to help. Message us to confirm that Q1B390 matches your panel model, wiring configuration, and load needs before purchasing.\u003c\/p\u003e \u003ch2\u003ePractical installation and care tips\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eTurn off power and lockout\/tagout prior to installation or service.\u003c\/li\u003e \u003cli\u003eEnsure the breaker is installed in an appropriate Square D panel compatible with the Q1B390.\u003c\/li\u003e \u003cli\u003eFollow all manufacturer installation instructions and local electrical codes for safe, compliant operation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"AmpState","offers":[{"title":"Default Title","offer_id":46415968305314,"sku":"Q1B390","price":460.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_513d6710-3734-4b27-839d-f68e6f4b470a.png?v=1765492974","url":"https:\/\/www.ampstate.com\/products\/square-d-q1b390-90a-3p-240v-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}