{"product_id":"square-d-qhb330-300a-3-pole-bolt-on-circuit-breaker","title":"Square D QHB330 - 300 A, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eSquare D QHB330\u003c\/strong\u003e is a rugged 300A, 3-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection for panelboards and load centers. Built to endure demanding environments, this unit pairs Square D’s proven reliability with a straightforward bolt-on installation that promotes a rigid, vibration-resistant bus connection.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e provides a rigid, vibration-resistant bus connection, helping maintain consistent protection even in environments with equipment or mechanical vibration.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection by combining thermal overload sensing with magnetic instantaneous trip for fast response to short circuits.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThree-pole, 300A protection\u003c\/strong\u003e ideal for three-phase feeders and large branch circuits, enabling reliable power distribution in commercial and light industrial panels.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM compatibility\u003c\/strong\u003e designed to be used with matching Square D OEM loadcenters and panelboards, ensuring proper fit, coordination, and electrical performance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile applications\u003c\/strong\u003e suitable for residential, commercial, and light industrial installations requiring robust protection and straightforward maintenance.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eUse this circuit breaker to safeguard feeders and critical equipment from overloads and short circuits, reducing the risk of costly downtime and equipment damage. Its bolt-on design simplifies retrofits and upgrades within existing Square D panels, making it a practical choice for service upgrades, panel refurbishments, or new installations that demand reliable protection with minimal complexity.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eKey specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eManufacturer: Square D\u003c\/li\u003e \u003cli\u003ePart Number: QHB330\u003c\/li\u003e \u003cli\u003eType: Thermal-magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003eAmperage Rating: 300A\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\u003e\u003cstrong\u003ePractical installation and use tips\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003ePair this QHB330 with compatible Square D panelboards to ensure optimal alignment and protection coordination across your electrical distribution system.\u003c\/li\u003e \u003cli\u003eBefore installation, verify panelamp compatibility and confirm that the service environment matches the device’s ratings for continuous operation.\u003c\/li\u003e \u003cli\u003eFor long-term reliability, inspect mounting hardware and bus connections during routine maintenance and replace the unit if wear or arcing signs appear.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eIn summary, the Square D QHB330 offers a high-capacity, three-pole bolt-on solution that combines secure mounting, precise thermal-magnetic protection, and OEM-aligned compatibility. It’s a purpose-built choice for professionals who demand durable, field-ready protection for both new builds and panel upgrades.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355391643810,"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_40219c48-8a4d-456f-81f3-17c82ec2239e.png?v=1764691749","url":"https:\/\/www.ampstate.com\/products\/square-d-qhb330-300a-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}