{"product_id":"square-d-qob3701021-70a-3-pole-bolt-on-circuit-breaker","title":"Square D QOB3701021 - 70 A, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eIntroducing the Square D QOB3701021, a 70 Amp, 3-pole bolt-on molded case circuit breaker engineered for dependable branch circuit protection in panelboards and load centers.\u003c\/p\u003e \u003cp\u003eBuilt for durability and steady performance, this unit features a secure bolt-on mounting that delivers a rigid, vibration-resistant bus connection—minimizing loosening risk in demanding electrical environments.\u003c\/p\u003e \u003cp\u003eThe thermal-magnetic trip unit provides stable, repeatable protection. It responds to both sustained overloads (thermal) and short circuits (magnetic), helping prevent wiring and equipment damage while minimizing nuisance trips during normal load fluctuations.\u003c\/p\u003e \u003cp\u003eKey capabilities at a glance:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e70 A, 3-pole design: supports 3-phase circuits with common-trip protection where required\u003c\/li\u003e \u003cli\u003eBolt-on mounting: secure installation in compatible panelboards and loadcenters\u003c\/li\u003e \u003cli\u003eMolded case construction: robust for residential, commercial, and light industrial applications\u003c\/li\u003e \u003cli\u003eCompatibility: designed to work with matching OEM loadcenters and panelboards\u003c\/li\u003e \u003cli\u003eProtection focus: branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eTechnical snapshot\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eManufacturer: Square D\u003c\/li\u003e \u003cli\u003ePart Number: QOB3701021\u003c\/li\u003e \u003cli\u003eType: Thermal-magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003eAmperage Rating: 70 A\u003c\/li\u003e \u003cli\u003eNumber of Poles: 3\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\u003eWho is this for? Electricians, facilities managers, and homeowners maintaining panelboards and load centers will appreciate the reliability and compatibility of the QOB3701021. It’s ideal for new installations in commercial spaces or retrofits in residential settings where a three-pole protection device is required for balanced or three-phase load scenarios.\u003c\/p\u003e \u003cp\u003eWhy choose this unit over generic breakers? The combination of secure bolt-on reliability, proven thermal-magnetic trip performance, and compatibility with Square D OEM panel systems ensures a component designed for long-term reliability in real-world electrical installations. Selecting a factory-matched breaker reduces the risk of nuisance trips and fitment issues often associated with aftermarket substitutes.\u003c\/p\u003e \u003cp\u003ePractical tips for installation and use:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eVerify your panelboard model is compatible with bolt-on QOB series breakers before installation\u003c\/li\u003e \u003cli\u003eAlign the 3-pole unit with the bus bars and tighten bolts to the recommended torque to ensure a solid connection\u003c\/li\u003e \u003cli\u003eSchedule periodic inspections of connections to maintain low-resistance paths and reduce heating under load\u003c\/li\u003e \u003cli\u003eEnsure the 70 A rating matches your branch circuit design to minimize unnecessary trips\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWith the Square D QOB3701021, you gain a purpose-built solution for reliable branch circuit protection—combining rugged construction, precise trip performance, and seamless compatibility with Square D panel systems.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355421462690,"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_3ec25e3b-dc8a-4134-bd09-c4e834ffbb9f.png?v=1764692000","url":"https:\/\/www.ampstate.com\/products\/square-d-qob3701021-70a-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}