{"product_id":"square-d-qob140-40a-120v-1-pole-bolt-on-circuit-breaker","title":"Square D QOB140 - 40 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eProtect and streamline your electrical panel with the Square D \u003cstrong\u003eQOB140\u003c\/strong\u003e 40A, 120V, 1-Pole Bolt-On Molded Case Circuit Breaker. Built for dependable branch-circuit overcurrent and short-circuit protection, this breaker is engineered to stay securely in place in panelboards and load centers, even in vibration-prone environments.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eBolt-on mounting\u003c\/strong\u003e for a rigid, vibration-resistant bus connection that maintains a solid electrical path and reduces loosening over time.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection: the thermal element handles gradual overloads, while the magnetic element responds rapidly to short circuits for fast isolation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible design\u003c\/strong\u003e engineered to pair with matching Square D OEM load centers and panelboards for a true plug-and-play installation with fewer compatibility concerns.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile applications\u003c\/strong\u003e suitable for residential, commercial, and light industrial environments where reliable 120V single-pole protection is required.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eUse cases you’ll appreciate:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eReplacing a failed breaker in compatible Square D panelboards where a 40A, 120V, 1-pole unit is needed for a dedicated branch circuit.\u003c\/li\u003e \u003cli\u003eAdding a dedicated 120V circuit for heavy-load appliances or equipment in a home workshop or small business setting, while maintaining clear, organized protection zoning.\u003c\/li\u003e \u003cli\u003eUpgrading older panels to modern, thermal-magnetic protection that delivers predictable trip behavior and helps minimize nuisance trips.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eTechnical snapshot\u003c\/strong\u003e — \u003cem\u003eSquare D\u003c\/em\u003e brand reliability in a single-pole package:\n\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eManufacturer: Square D\u003c\/li\u003e \u003cli\u003ePart Number: QOB140\u003c\/li\u003e \u003cli\u003eType: Thermal-magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003eAmperage Rating: 40A\u003c\/li\u003e \u003cli\u003eVoltage Rating: 120V\u003c\/li\u003e \u003cli\u003eNumber of Poles: 1\u003c\/li\u003e \u003cli\u003eMounting Style: Bolt-on\u003c\/li\u003e \u003cli\u003eApplication: Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eIdeal for electricians and DIY enthusiasts deploying reliable, compatible protection in residential panels, small commercial panels, or light industrial setups. The Square D QOB140 is more than a breaker—it’s a steadfast guardian for your electrical system, delivering predictable protection, solid mounting, and OEM-aligned compatibility. Ready to secure your circuits with confidence? Add the Square D QOB140 to your panel today.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355408748706,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/schnieder_and_square_d_breaker_and_panel_ae3488f4-a682-4f02-9fd8-66db4d90c2d9.png?v=1764691912","url":"https:\/\/www.ampstate.com\/products\/square-d-qob140-40a-120v-1-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}