{"product_id":"square-d-a1140-circuit-breaker","title":"Square D | A1140 | Circuit Breaker | 40A | 1-Pole | 120V | Bolt-On","description":"\u003cdiv\u003e\n\u003cp\u003eThe Square D A1140 Circuit Breaker is a purpose-built protection device designed for reliable, once-and-done compatibility in maintenance, retrofit, and replacement projects. With exact 40A, 1-pole, 120V specifications, this bolt-on breaker plugs into compatible Square D panels to restore essential overcurrent protection where original components are needed.\u003c\/p\u003e \u003cp\u003eWhy choose a bolt-on design? The bolt-on mounting delivers a secure, robust connection to the panel bus, reducing the risk of loose contacts and ensuring consistent trip performance. This makes the A1140 a dependable choice for scenarios where a precise, high-amperage 120V single-pole solution is required, whether you’re refurbishing an older installation or replacing a failed unit during routine service.\u003c\/p\u003e \u003ch3\u003eKey specifications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 40A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 1-Pole\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 120V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Bolt-On\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e A1140\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eSpecific use cases and benefits\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eRepair or upgrade of Square D panels that require a 40A, 1-pole, 120V bolt-on breaker to restore proper circuit protection for heavy-duty 120V circuits.\u003c\/li\u003e \u003cli\u003eRetrofit projects where matching the original part number (A1140) is the cleanest path to compatibility and code-compliant protection.\u003c\/li\u003e \u003cli\u003eMaintenance replacements that minimize downtime by fitting into the same physical footprint and electrical ratings as the existing unit.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eHow to confirm fit and maximize safety\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eAlways \u003cstrong\u003econfirm fit and ratings before ordering\u003c\/strong\u003e. The part number is the most reliable reference for compatibility with your Square D panel and bus configuration.\u003c\/li\u003e \u003cli\u003eEnsure your installation matches the panel’s requirements for single-pole, 120V protection and that the surrounding wiring and terminations are rated for 40A conductors.\u003c\/li\u003e \u003cli\u003eWith the main power off, replace only the breaker that matches the existing amperage and pole configuration to maintain balanced protection across the panel.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWho this is for\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eHomeowners and professionals performing panel maintenance, retrofits, or replacements in Square D systems.\u003c\/li\u003e \u003cli\u003eTechnicians seeking a dependable, brand-backed 40A, 1-pole, 120V bolt-on option that aligns with original equipment specifications.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhy this matters in real-world terms\u003c\/p\u003e\n\u003cp\u003eChoosing the right 40A 1-pole 120V bolt-on breaker means safeguarding high-load circuits without overfitting non-matching components. The A1140 delivers predictable trip behavior, quick installation in compatible panels, and the peace of mind that comes from using a trusted Square D part designed for precise electrical protection.\u003c\/p\u003e \u003cp\u003eReady to restore reliable protection to your 120V circuit? The Square D A1140 is purpose-built for precise compatibility, straightforward bolt-on installation, and enduring performance in retrofit and replacement projects.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Square D","offers":[{"title":"Default Title","offer_id":46427298693282,"sku":"A1140","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_ad06fdd7-931c-4a09-bfbe-d05329579cd6.png?v=1765492978","url":"https:\/\/www.ampstate.com\/products\/square-d-a1140-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}