{"product_id":"square-d-fa14040b-40a-1-pole-plug-in-circuit-breaker","title":"Square D FA14040B - 40 A, 1-Pole Plug-In Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eThe Square D FA14040B is a 40 A, 1-pole plug-in molded case circuit breaker engineered for dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Designed for residential, commercial, and light industrial environments, this breaker delivers fast, reliable protection where it matters most, so electrical systems stay safe and productive.\u003c\/p\u003e \u003ch2\u003eKey advantages that matter in the field\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eFast plug-in connection\u003c\/strong\u003e enables quick installation and effortless replacement in existing panels, minimizing downtime during upgrades or repairs.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e provides stable, repeatable protection by reacting to overloads (thermal) and short circuits (magnetic) with precise timing, reducing nuisance trips.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible design\u003c\/strong\u003e is crafted to fit matching Square D load centers and panelboards, ensuring seamless compatibility and dependable performance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSingle-pole, 40 A configuration\u003c\/strong\u003e offers targeted protection for individual branch circuits, helping to safeguard wiring and connected devices without unnecessary shutdowns.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile for multiple applications\u003c\/strong\u003e—well suited for residential service panels, light commercial setups, and selective industrial installations where reliable circuit protection is essential.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhat problems does it solve?\u003c\/h2\u003e\n\u003cp\u003eOvercurrent events and short-circuit faults can cause damage, downtime, and safety concerns. The Square D FA14040B provides immediate, predictable response to these threats, protecting conductors and devices on the protected circuit while maintaining system continuity for all other circuits. Its plug-in design reduces installation errors and simplifies field replacements, so maintenance crews can service panels quickly without unnecessary downtime.\u003c\/p\u003e \u003ch2\u003eIdeal use cases\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eResidential panelboards needing dependable 40 A protection for dedicated circuits like HVAC feeders or water heating equipment.\u003c\/li\u003e \u003cli\u003eCommercial panel installations where quick replacements and reliable trip performance are critical for uptime.\u003c\/li\u003e \u003cli\u003eLight industrial control panels requiring a robust, plug-in molded case breaker that aligns with Square D OEM components.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eCompatibility \u0026amp; installation tips\u003c\/h2\u003e\n\u003cp\u003eDesigned to work with matching Square D panelboards and load centers, the FA14040B is selected when OEM compatibility and consistent trip characteristics matter. For best results:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eVerify that your panel is designed for plug-in molded case breakers of this type and rating.\u003c\/li\u003e \u003cli\u003eWhen replacing an existing breaker, ensure the new unit is the correct part number (FA14040B) to maintain the panel’s protection profile.\u003c\/li\u003e \u003cli\u003eFollow manufacturer torque specifications on the terminal connection to ensure a secure, long-lasting electrical connection.\u003c\/li\u003e \u003cli\u003eAlways power down equipment and follow safety procedures when performing panel work or replacements.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eSpecifications at a glance\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 FA14040B\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Thermal-magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage Rating:\u003c\/strong\u003e 40 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 1\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting Style:\u003c\/strong\u003e Plug-in\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhy this matters for you\u003c\/h2\u003e\n\u003cp\u003eChoosing the Square D FA14040B means prioritizing reliable protection with predictable trip behavior and streamlined maintenance in panels you already own or plan to install. Its plug-in format reduces service time, while its thermal-magnetic mechanism delivers protection that adapts to varying loads, helping prevent damage and downtime across homes, offices, and light industrial spaces. When you need a dependable 40 A, 1-pole solution that integrates cleanly with Square D OEM panels, the FA14040B is a smart, efficient choice.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355215777954,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/square-d-fa14040b-40-a-1-pole-plug-in-circuit-breaker-ampstate-900.webp?v=1788741985","url":"https:\/\/www.ampstate.com\/products\/square-d-fa14040b-40a-1-pole-plug-in-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}