{"product_id":"siemens-cqd145-45a-277v-1-pole-circuit-breaker","title":"Siemens CQD145 - 45 A, 277 V, 1-Pole Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Siemens CQD145—a reliable, single-pole molded case circuit breaker engineered for dependable branch-circuit protection in panelboards and load centers. Rated at 45A and 277V, this compact unit is built to handle everyday electrical demand while delivering precise protection that electricians can count on in residential, commercial, and light industrial settings.\u003c\/p\u003e \u003ch2\u003eWhy the CQD145 stands out on the job\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSpace-efficient design:\u003c\/strong\u003e Its compact molded case form fits neatly into crowded panel spaces, helping you maximize panel capacity without compromising protection.\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 short-circuit tripping, reducing nuisance trips and ensuring fast response when faults occur.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-ready compatibility:\u003c\/strong\u003e Seamlessly matches Siemens panelboards and load centers, simplifying replacements and upgrades with consistent performance and fit.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile voltage rating:\u003c\/strong\u003e 277V rating broadens use for commercial lighting, equipment circuits, and other 277V applications commonly found in today’s facilities.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClear specification for decision-making:\u003c\/strong\u003e A straightforward 1-pole, 45A, 277V configuration that clearly aligns with branch-circuit protection needs in a variety of environments.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eTechnical specifications at a glance\u003c\/h2\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 CQD145\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 45A\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 in panelboards and load centers\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eIdeal for\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eElectricians upgrading or replacing aging breakers in Siemens-compatible panelboards.\u003c\/li\u003e \u003cli\u003eSmall to mid-size commercial spaces with 277V lighting circuits and general branch circuits.\u003c\/li\u003e \u003cli\u003eLight industrial installations where reliable protection and space efficiency matter.\u003c\/li\u003e \u003cli\u003eResidential projects that rely on compatible Siemens protection devices for consistent performance.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePractical uses and scenarios\u003c\/h2\u003e\n\u003cp\u003eIn a office suite or retail environment, the CQD145 can guard lighting and receptacle circuits, preventing damage from overloads or short circuits. In light industrial settings, it provides fast magnetic response to sudden faults, minimizing equipment downtime. Its OEM compatibility means you can confidently source this exact replacement for existing Siemens installations, reducing compatibility questions during retrofit projects.\u003c\/p\u003e \u003ch2\u003eInstallation tips and best practices\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eVerify that your panelboard accepts 1-pole molded case breakers from the CQD family and is rated for 277V circuits.\u003c\/li\u003e \u003cli\u003eEnsure proper shutoff procedures and lockout\/tagout before replacement or installation.\u003c\/li\u003e \u003cli\u003eUse within its 45A rating to protect branch circuits that draw current within safe limits, preventing nuisance trips and equipment wear.\u003c\/li\u003e \u003cli\u003eConsult project documentation to confirm that the CQD145 is the correct form factor for your Siemens-compatible load center.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhy this Siemens breaker is a solid choice\u003c\/h2\u003e\n\u003cp\u003eThe CQD145 is more than a basic protection device—it's a purposeful choice for reliable, predictable performance in real-world electrical systems. The combination of a robust thermal-magnetic trip unit, space-conscious molded case design, and seamless OEM compatibility translates to smoother installations, fewer compatibility hassles, and clearer maintenance planning. For projects that demand dependable protection without sacrificing panel efficiency, the CQD145 delivers.\u003c\/p\u003e \u003cp\u003eAvailable from AmpState, the Siemens CQD145 provides a precise, proven solution for safeguarding branch circuits today—so you can install with confidence and keep systems running smoothly tomorrow.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349782352034,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens_breaker_and_panel_ad153b7c-88cf-4b33-881a-3379407a2981.png?v=1764156523","url":"https:\/\/www.ampstate.com\/products\/siemens-cqd145-45a-277v-1-pole-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}