{"product_id":"square-d-qou3401021-40a-3p-circuit-breaker","title":"Square D QOU3401021 40A 3P Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet a trusted workhorse for electrical protection—the Square D QOU3401021 40A 3P Circuit Breaker. Built for everyday electrical work, this unit provides reliable circuit protection in panelboards, load centers, and electrical distribution systems. With a 40-amp trip rating and three poles, it is tailored for 3-phase configurations where consistent protection matters.\u003c\/p\u003e \u003cp\u003eWhether you're a maintenance technician, a panel builder, or maintaining spare inventory, this direct part-number match delivers peace of mind when time and accuracy matter. The QOU3401021 is specifically designed to slot into compatible Square D panels and distribution setups without guesswork.\u003c\/p\u003e \u003ch3\u003eKey features and benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e40 A, 3-pole\u003c\/strong\u003e circuit breaker ideal for 3-phase circuits in commercial or industrial panelboards and load centers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect part-number match\u003c\/strong\u003e ensures compatibility with Square D systems, reducing selection errors on job sites.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReliable protection\u003c\/strong\u003e helps guard wiring and equipment from overloads and short circuits, supporting safer electrical distribution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact integration\u003c\/strong\u003e fits standard Square D enclosures, enabling clean, organized panel layouts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailability from AmpState\u003c\/strong\u003e to support maintenance schedules, emergency stock, and project pipelines.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWho is this for\u003c\/h3\u003e\n\u003cp\u003eThis breaker is a smart choice for service teams, panel builders, and anywhere you maintain stocked parts for Square D installations. If you’re assembling or upgrading 3-phase distributions, this 40A 3P unit keeps spare panels ready and reduces downtime on site.\u003c\/p\u003e \u003ch3\u003ePractical guidance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eConfirm compatibility with your panelboard or load center by referencing the part number QOU3401021 and Square D branding.\u003c\/li\u003e\n\u003cli\u003eKeep a few units in reserve for quick replacements during routine maintenance or fault isolation in 3-phase systems.\u003c\/li\u003e\n\u003cli\u003eWhen in doubt about fit, AmpState offers support to verify compatibility and fitment before purchase.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eReady to secure reliable protection with a direct part-number match? Add the Square D QOU3401021 40A 3P Circuit Breaker from AmpState to your toolbox, and keep your electrical distribution running smoothly.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"AmpState","offers":[{"title":"Default Title","offer_id":46411058380962,"sku":"QOU3401021","price":1089.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/square-d-qou3401021-40a-3p-circuit-breaker-ampstate-breakers-914.webp?v=1789011259","url":"https:\/\/www.ampstate.com\/products\/square-d-qou3401021-40a-3p-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}