{"product_id":"siemens-cqd390-90a-480v-3-pole-circuit-breaker","title":"Siemens CQD390 - 90 A, 480 V, 3-Pole Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eThe \u003cstrong\u003eSiemens CQD390\u003c\/strong\u003e is a \u003cstrong\u003e90A, 480V, 3-pole molded-case circuit breaker\u003c\/strong\u003e engineered to shield branch circuits from overcurrent and short-circuit events. Designed to slot into Siemens OEM load centers and panelboards, this unit delivers reliable protection in a compact footprint, making it an ideal choice for residential, commercial, and light industrial applications. Its thermal-magnetic trip unit responds quickly to abnormal conditions, delivering stable, repeatable protection across varying loads and temperatures. Available through AmpState, the CQD390 integrates smoothly with compatible equipment to form a cohesive electrical system.\u003c\/p\u003e \u003ch3\u003eKey Benefits\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eCompact molded-case design\u003c\/strong\u003e maximizes panel space for streamlined electrical layouts.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e provides stable, repeatable protection against both overloads and short circuits.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e3-pole configuration\u003c\/strong\u003e ideal for three-phase distribution and equipment feeders.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM compatibility\u003c\/strong\u003e designed to work with matching Siemens load centers and panelboards for straightforward installation and reliable performance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile applications\u003c\/strong\u003e suitable for residential panels, commercial electrical distribution, and light industrial setups.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eTechnical Specifications\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 CQD390\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 90A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage Rating:\u003c\/strong\u003e 480V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3\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 \u003ch3\u003eIdeal Use Scenarios\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eUpgrading or expanding commercial distribution panels to safely protect new feeders.\u003c\/li\u003e \u003cli\u003eInstalling three-phase equipment in light industrial environments, such as HVAC packs, pumps, and motors.\u003c\/li\u003e \u003cli\u003eResidential and small business panelboards requiring reliable, OEM-compatible protection with a compact form factor.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eCompatibility \u0026amp; Installation Considerations\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eDesigned to \u003cstrong\u003ematch Siemens OEM load centers and panelboards\u003c\/strong\u003e for cohesive performance and straightforward replacement.\u003c\/li\u003e \u003cli\u003eThermal-magnetic protection minimizes nuisance trips while delivering prompt response to genuine faults.\u003c\/li\u003e \u003cli\u003eWhen wiring, ensure alignment with specification for 480V three-phase systems and follow standard electrical safety practices.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349783826594,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens-cqd390-90-a-480-v-3-pole-circuit-breaker-ampstate-breakers-598.webp?v=1788724369","url":"https:\/\/www.ampstate.com\/products\/siemens-cqd390-90a-480v-3-pole-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}