{"product_id":"square-d-qob2401021-40a-2-pole-bolt-on-circuit-breaker","title":"Square D QOB2401021 - 40 A, 2-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D QOB2401021 — a dependable, bolt-on molded case circuit breaker engineered to shield your electrical systems with precision. Designed for reliable branch circuit overcurrent and short-circuit protection, this 40A, 2-pole unit is a smart upgrade for panelboards and loadcenters that demand rock-solid performance and durable construction.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e delivers a rigid, vibration-resistant bus connection, reducing arcing risk and maintaining consistent protection in demanding environments.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e provides stable, repeatable protection by precisely responding to both overloads and short circuits, helping to prevent nuisance tripping while safeguarding wiring and devices.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible design\u003c\/strong\u003e is tuned to work seamlessly with matching Square D loadcenters and panelboards, simplifying replacement and upgrade projects.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile for multiple settings\u003c\/strong\u003e ideal for residential panels, commercial electrical rooms, and light industrial installations where dependable circuit protection matters.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e2-pole, 40A configuration\u003c\/strong\u003e targets two energized conductors, offering effective protection for circuits that require coordinated, dual-line interruption.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this breaker stands out\u003c\/h3\u003e\n\u003cp\u003eUnlike generic replacements, the QOB2401021 is built to integrate with Square D’s ecosystem, ensuring compatibility, reliability, and consistent performance with your existing equipment. The bolt-on mounting paired with a robust riser-free bus connection minimizes movement and wear over time, which translates to fewer service calls and longer-lasting protection.\u003c\/p\u003e \u003ch3\u003eUse cases and installation scenarios\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eUpgrading a residential main or sub-panel where a dependable 40A, 2-pole breaker is required.\u003c\/li\u003e \u003cli\u003eRetrofitting small commercial panels that demand precise thermal-magnetic protection for lighting, plugs, and small equipment circuits.\u003c\/li\u003e \u003cli\u003eReplacements in loadcenters where OEM compatibility reduces installation headaches and ensures maximum protection performance.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eTechnical specifications at a glance\u003c\/h3\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 QOB2401021\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 40A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 2\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting Style:\u003c\/strong\u003e Bolt-on\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 \u003ch3\u003ePractical considerations and tips\u003c\/h3\u003e\n\u003cp\u003eWhen selecting this breaker, verify your panelboard or loadcenter is compatible with Square D QOB-series devices. For installations, follow the applicable electrical codes and manufacturer data sheets to ensure proper torque on the bolt-on connection and secure seating within the panel. This unit pairs well with residential, commercial, and light industrial circuits that require dependable protection without frequent tripping or play in the connection.\u003c\/p\u003e \u003cp\u003eWith the Square D QOB2401021, you gain a reliable, purpose-built solution that protects your electrical system while delivering straightforward replacement and durable performance in a variety of environments.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355411927202,"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_73e9b482-45f7-4b34-af22-3395cdad9e9f.png?v=1764691945","url":"https:\/\/www.ampstate.com\/products\/square-d-qob2401021-40a-2-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}