{"product_id":"square-d-qob21251021-125a-2-pole-bolt-on-circuit-breaker","title":"Square D QOB21251021 - 125 A, 2-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D QOB21251021 — a 125A, 2-pole bolt-on molded case circuit breaker engineered to safeguard panelboards and load centers from overcurrent and short circuits.\u003c\/p\u003e \u003cp\u003eDesigned for durable operation in residential, commercial, and light industrial environments, this breaker offers a secure bolt-on mounting that creates a rigid, vibration-resistant bus connection, reducing movement and loosening over time. The thermal-magnetic trip unit delivers stable, repeatable protection performance, opening the circuit quickly on faults while minimizing nuisance trips during normal load fluctuations.\u003c\/p\u003e \u003cp\u003eKey features\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e125A, 2-pole bolt-on design\u003c\/strong\u003e provides dedicated protection for a wide range of circuits with straightforward replacement in compatible panels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBolt-on mounting\u003c\/strong\u003e ensures a solid, vibration-resistant connection to bus bars for long-term reliability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e blends thermal protection for overload with magnetic trip for instantaneous short-circuit response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM compatibility\u003c\/strong\u003e with matching Square D load centers and panelboards for seamless integration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile applications\u003c\/strong\u003e ideal for residential service panels, commercial equipment rooms, and light industrial installations needing dependable branch-circuit protection.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWho benefits from the QOB21251021?\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eElectricians upgrading or expanding panelboards and load centers who require a reliable 125A, 2-pole bolt-on breaker.\u003c\/li\u003e\n\u003cli\u003eHomeowners or facility managers performing subpanel installs or circuit protection upgrades where a robust, consistent trip characteristic matters.\u003c\/li\u003e\n\u003cli\u003eMaintenance teams that value vibration resistance and stable performance under varying loads.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eTechnical snapshot\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePart number: QOB21251021\u003c\/li\u003e\n\u003cli\u003eType: Thermal-magnetic molded case circuit breaker\u003c\/li\u003e\n\u003cli\u003eAmperage rating: 125 A\u003c\/li\u003e\n\u003cli\u003eNumber of poles: 2\u003c\/li\u003e\n\u003cli\u003eMounting style: Bolt-on\u003c\/li\u003e\n\u003cli\u003eApplications: Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355409895586,"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_9574f0d7-0717-46e8-a5e3-5e8bd6b6da5e.png?v=1764691923","url":"https:\/\/www.ampstate.com\/products\/square-d-qob21251021-125a-2-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}