{"product_id":"square-d-qhb320-20a-3-pole-bolt-on-circuit-breaker","title":"Square D QHB320 - 20 A, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eThe Square D QHB320 delivers reliable protection for branch circuits in panelboards and loadcenters with a compact, rugged design that technicians trust. Engineered as a 20A, 3-pole bolt-on molded case circuit breaker, it combines precise protection with straightforward installation, making it a smart choice for residential upgrades, commercial panel additions, or light industrial control panels.\u003c\/p\u003e \u003ch2\u003eWhy the Square D QHB320 Stands Out\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e provides a rigid, vibration-resistant bus connection, helping maintain consistent electrical contact in installations where equipment experiences movement or vibration.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection by responding to both overcurrent conditions and short circuits, reducing nuisance trips and safeguarding downstream components.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-ready compatibility\u003c\/strong\u003e is designed to work with matching Square D load centers and panelboards, simplifying replacements and upgrades without compromising fit or performance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile application\u003c\/strong\u003e suitable for residential panels, commercial distribution, and light industrial applications where dependable circuit protection is essential.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eKey Features and Benefits\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage rating: 20A\u003c\/strong\u003e tailoring protection for individual branch circuits without over-restraining performance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNumber of poles: 3\u003c\/strong\u003e ideal for three-phase or multi-circuit configurations common in modern panels.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting style: Bolt-on\u003c\/strong\u003e ensures a solid connection and simplifies field installation or retrofits in existing enclosures.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eType: Thermal-magnetic molded case circuit breaker\u003c\/strong\u003e combines precise thermal (overload) protection with rapid magnetic (short-circuit) response.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer\/Part\u003c\/strong\u003e Square D, QHB320 — a trusted solution from a recognized name in electrical protection.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eIdeal Applications\u003c\/h2\u003e\n\u003cp\u003eUse the QHB320 when you need dependable branch circuit protection in:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eResidential main or subpanel upgrades where a reliable 20A, 3-pole breaker is needed.\u003c\/li\u003e \u003cli\u003eCommercial load centers powering lighting, outlets, or small equipment circuits.\u003c\/li\u003e \u003cli\u003eLight industrial panels requiring robust protection with a secure bolt-on installation.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePractical Guidance and Use Cases\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eWhen upgrading or adding circuits, pair the QHB320 with matching OEM load centers to ensure optimal fit, performance, and compatibility with existing bus connections.\u003c\/li\u003e \u003cli\u003eFor installations in environments with periodic vibration (pumps, HVAC equipment, machinery), the bolt-on design helps maintain a stable electrical connection over time.\u003c\/li\u003e \u003cli\u003eIn retrofit projects, verify that the panelboard supports 3-pole breakers of this type and that wire sizing and overcurrent protection align with local electrical codes.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eSpecifications at a Glance\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eManufacturer: Square D\u003c\/li\u003e \u003cli\u003ePart Number: QHB320\u003c\/li\u003e \u003cli\u003eType: Thermal-magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003eAmperage Rating: 20A\u003c\/li\u003e \u003cli\u003eNumber of Poles: 3\u003c\/li\u003e \u003cli\u003eMounting Style: Bolt-on\u003c\/li\u003e \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":46355391545506,"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_566a8eab-71ff-4bc2-9617-f0eb44f6e69b.png?v=1764691747","url":"https:\/\/www.ampstate.com\/products\/square-d-qhb320-20a-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}