{"product_id":"square-d-qob2151021-15a-2-pole-bolt-on-circuit-breaker","title":"Square D QOB2151021 - 15 A, 2-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D QOB2151021 — a dependable 15A, 2-pole bolt-on molded case circuit breaker designed to protect your electrical system with precision. Built for panelboards and load centers, this unit delivers reliable branch circuit overcurrent and short-circuit protection in a compact, rugged package.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e provides a rigid, vibration-resistant bus connection. This means fewer micro-movements, less risk of arcing, and steadier performance in demanding environments where panels may experience vibration or movement.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e combines a thermal element for steady overload protection with a magnetic element for rapid response to high-energy faults. The result is stable, repeatable protection that helps safeguard wiring, devices, and occupants.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible design\u003c\/strong\u003e is engineered to fit matching Square D load centers and panelboards, ensuring proper fit, timing, and coordinated trip characteristics for seamless system protection.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile application\u003c\/strong\u003e ideal for residential, commercial, and light industrial circuits that require reliable, code-compliant branch circuit protection.\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 QOB2151021\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 15 A\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\u003eWhy this breaker stands out\u003c\/h3\u003e\n\u003cp\u003eUnlike generic substitutes, the QOB2151021 is purpose-built for Square D panelboards, which means you’ll enjoy a precise trip curve, guaranteed fit, and dependable performance over the life of the installation. The combination of bolt-on mounting and a robust molded-case construction translates to a more durable connection in environments where equipment is subjected to vibration, temperature changes, or routine maintenance.\u003c\/p\u003e \u003ch3\u003eUse cases and ideal installations\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eNew installations in residential service panels where a compact, reliable 2-pole breaker is required for multiwire branch circuits or 120\/240V services.\u003c\/li\u003e \u003cli\u003eRetrofitting or upgrading older panelboards in small commercial spaces, ensuring continued protection with OEM-compatible components.\u003c\/li\u003e \u003cli\u003eLight industrial setups where consistent protection for lighting circuits, receptacle banks, or dedicated equipment is essential, and panel durability matters.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003ePractical considerations and best practices\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eEnsure compatibility by selecting a matching Square D OEM load center or panelboard to preserve coordinated protection and accurate trip settings.\u003c\/li\u003e \u003cli\u003eWhen installing, follow standard electrical practice for bolt-on breakers: disconnect power, secure the breaker firmly to the bus, and verify that the mounting hardware remains tightened to the manufacturer’s guidelines.\u003c\/li\u003e \u003cli\u003eUse this breaker for branch circuits requiring reliable protection against overloads and short circuits, especially in environments where panel vibration is a factor or periodic maintenance occurs.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eIn short, the Square D QOB2151021 delivers targeted, durable protection for a range of electrical installations. Its bolt-on design, thermal-magnetic protection, and OEM-fitment make it a practical choice for professionals seeking dependable performance without compromise. If you’re upgrading panelboard protection or replacing aging devices, this 2-pole, 15A breaker offers the right balance of reliability, compatibility, and ease of installation to keep your electrical system safe and compliant.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355410026658,"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_d512b1eb-1ae7-465b-b94f-365ed7648543.png?v=1764691927","url":"https:\/\/www.ampstate.com\/products\/square-d-qob2151021-15a-2-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}