{"product_id":"qo140","title":"Square D QO140 - 40A, Circuit Breaker","description":"\u003cdiv\u003e\n\u003cp\u003eEngineered for dependable overcurrent protection in demanding electrical environments, the \u003cstrong\u003eSquare D QO140\u003c\/strong\u003e 40A circuit breaker is a practical choice for machines, panels, and control systems that run hard every day.\u003c\/p\u003e \u003cp\u003eWhere it fits and what it protects\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003e40A rating\u003c\/strong\u003e provides targeted protection for feeders and branch circuits in panelboards, switchboards, control panels, and OEM equipment.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eQO family compatibility\u003c\/strong\u003e ensures straightforward replacement and reliable operation within Square D QO panelboards and assemblies.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eReliable protection in motor control centers\u003c\/strong\u003e—designed to shut down circuits cleanly when overloads occur, helping prevent damage to motors and downstream devices.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRugged, industrial-grade construction\u003c\/strong\u003e built to withstand the vibration, temperature variations, and rigors of commercial and industrial facilities.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIdeal for OEM applications\u003c\/strong\u003e—whether stocking spare parts or integrating into a new build, this breaker fits panels and equipment that require 40A protection.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eUse cases and practical scenarios\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eUpgrading aging protection in existing QO panelboards or switchgear, ensuring consistent 40A safeguarding for critical circuits.\u003c\/li\u003e \u003cli\u003eProviding dedicated 40A protection on motor feeds or heater circuits within control panels and motor control centers.\u003c\/li\u003e \u003cli\u003eOEM equipment design and manufacturing where a trusted 40A circuit breaker is a core safety component.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhy choose the Square D QO140 over other options\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003ePart of the proven Square D QO family, the QO140 offers reliable, predictable trip behavior that sensitive equipment and operators can depend on.\u003c\/li\u003e \u003cli\u003e Seamless integration with existing QO installations minimizes downtime during replacement or upgrades.\u003c\/li\u003e \u003cli\u003eClear, intuitive labeling and compatibility with standard QO mounting practices simplify maintenance and service planning.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003ePractical guidance for installation and care\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eVerify compatibility with your QO-series panelboard, switchboard, or OEM enclosure before installation.\u003c\/li\u003e \u003cli\u003eInstall in the correct pole position as specified for your system and ensure all connections meet the facility’s electrical standards.\u003c\/li\u003e \u003cli\u003eConsult your panel’s documentation for proper labeling, replacement intervals, and safety precautions during maintenance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Square D","offers":[{"title":"Default","offer_id":46390790422690,"sku":"QO140","price":261.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/circuit_breaker_generic_2e884df7-9bd2-415d-8268-c1046ae50e9b.png?v=1765379828","url":"https:\/\/www.ampstate.com\/products\/qo140","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}