{"product_id":"commander-40-amp-circuit-breaker-qbh340-40a-circuit-breaker","title":"Commander 40 Amp Circuit Breaker QBH340 - 40 A Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Commander QBH340 40 Amp Circuit Breaker—a molded case breaker purpose-built for dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. Its compact design helps you maximize panel space without sacrificing protection, making it an ideal choice for streamlined, reliable electrical installations in a wide range of settings.\u003c\/p\u003e \u003ch3\u003eKey features that matter in the real world\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eCompact molded case design\u003c\/strong\u003e saves panel space and simplifies layout, allowing more room for essential circuits in tight panels.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection by combining overload sensing with fast short-circuit response, reducing nuisance trips and safeguarding downstream wiring.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e40 Ampere rating (40A)\u003c\/strong\u003e provides solid protection for typical residential branch circuits, as well as light commercial and industrial applications.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM compatibility\u003c\/strong\u003e is designed to work with matching OEM loadcenters and panelboards for straightforward replacement and seamless integration.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile application\u003c\/strong\u003e suitable for residential, commercial, and light industrial environments, accommodating a variety of load profiles and duty cycles.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eTechnical snapshot\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e QBH340\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 40A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Commander\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eIdeal uses and real-world scenarios\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eReplacing a blown or unreliable 40A breaker in existing panelboards or loadcenters to restore reliable protection for a dedicated circuit (e.g., HVAC, ovens, water heaters, or subpanels).\u003c\/li\u003e \u003cli\u003eUpgrading panel protection in small offices, retail spaces, or light manufacturing where compact form factors save space without compromising safety.\u003c\/li\u003e \u003cli\u003eNew installations where OEM compatibility with the panelboard family ensures a smooth, hassle-free setup and faster commissioning.\u003c\/li\u003e \u003cli\u003eMaintenance projects that require a dependable, repeatable trip response across varying temperatures and electrical loads.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this breaker stands out\u003c\/h3\u003e\n\u003cp\u003eWhile there are many options, the QBH340’s combination of a compact molded case design and a thermal-magnetic trip unit provides two essential advantages: efficient use of panel space and precise protection that minimizes nuisance trips on moderate fault conditions. Its OEM-compatible architecture means you can swap in confidently for the intended panelboards and loadcenters without additional adapters or kits, preserving the integrity of your electrical system.\u003c\/p\u003e \u003ch3\u003ePractical tips for best results\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eVerify that your panelboard or loadcenter is listed as compatible with the QBH340 series to ensure a seamless fit and reliable operation.\u003c\/li\u003e \u003cli\u003eWhen installing, follow manufacturer guidelines for mounting orientation and termination torque to maintain the integrity of the connection and protection characteristics.\u003c\/li\u003e \u003cli\u003eKeep a spare QBH340 on hand for quick replacements in routine service outages, reducing downtime on critical circuits.\u003c\/li\u003e \u003cli\u003eMatch the breaker rating to the protected circuit’s ampacity and conductor size to maintain proper protection coordination and prevent mis-tripping.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eIn summary, the Commander QBH340 40A circuit breaker delivers space-efficient protection, reliable thermal-magnetic performance, and OEM-friendly compatibility—an excellent choice for professionals and seasoned DIYers looking to safeguard circuits in panelboards and loadcenters with confidence.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349486194850,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/eaton_breaker_and_panels_22071659-a44e-4476-8579-d512940357e3.png?v=1764147948","url":"https:\/\/www.ampstate.com\/products\/commander-40-amp-circuit-breaker-qbh340-40a-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}