{"product_id":"siemens-cqd140-40a-277v-1-pole-circuit-breaker","title":"Siemens CQD140 - 40 A, 277 V, 1-Pole Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eThe Siemens CQD140 is a 40A, 277V, 1-pole molded-case circuit breaker built to deliver reliable branch-circuit overcurrent and short-circuit protection in panelboards and load centers. Its compact molded-case design helps you maximize panel space, letting you fit more protection where it matters most while maintaining clean, organized wiring routes.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSpace-efficient design:\u003c\/strong\u003e The molded-case construction is engineered to minimize footprint, enabling tighter panel layouts without compromising protection.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit:\u003c\/strong\u003e Delivers stable, repeatable protection by responding quickly to overloads and short-circuits, reducing nuisance trips and improving reliability across varying loads.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible reliability:\u003c\/strong\u003e Designed to pair seamlessly with matching Siemens OEM load centers and panelboards, ensuring coordinated protection and predictable performance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile application:\u003c\/strong\u003e Suitable for residential, commercial, and light industrial electrical systems, especially 277V circuits common in commercial lighting and power distribution.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eKey benefits you can expect with the CQD140 include longer service life through precise thermal-magnetic protection, simplified panel planning due to its compact form factor, and a straightforward replacement path when upgrading or expanding existing panelboards. By choosing a 1-pole 40A breaker rated at 277V, you’re safeguarding individual branch circuits against overloads and short circuits while preserving clarity and ease of maintenance in your electrical distribution system.\u003c\/p\u003e \u003ch3\u003eSpecifications at a glance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Siemens\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e CQD140\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\u003eVoltage Rating:\u003c\/strong\u003e 277V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 1\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhether you’re upgrading an older panel, expanding a commercial storefront, or configuring a new subpanel in a light industrial setting, the CQD140 offers a dependable, well-supported solution. Its combination of compactness, precise protection, and OEM compatibility makes it a practical choice for standard 277V branch circuits that require consistent performance and straightforward installation.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349782286498,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens-cqd140-40-a-277-v-1-pole-circuit-breaker-ampstate-breakers-752.webp?v=1788724111","url":"https:\/\/www.ampstate.com\/products\/siemens-cqd140-40a-277v-1-pole-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}