{"product_id":"resideo-at120b1028-u-foot-mounted-transformer-20-va","title":"Resideo at120b1028\/u Foot Mounted Transformer 20 Va","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe RESIDEO at120b1028\/u is a foot-mounted, general-purpose step-down transformer designed to supply 24 volt AC power to low-voltage control circuits. Rated at 20 VA with a primary input of 120 volts AC at 60 Hz and a secondary open-circuit voltage of 27 volts, it delivers stable power to thermostats, relays, and other Class 2 control devices. The unit ships with metal end bells installed and connects via leadwire terminations on both the primary and secondary sides. Licensed HVAC technicians and controls specialists are the typical installers for this component.\u003c\/p\u003e\n\u003cp\u003eThis transformer is suited for residential and light commercial heating and cooling control systems where a reliable 24 volt AC supply is required. It can also be applied in any general-purpose low-voltage control circuit that does not exceed the 20 VA load rating. The operating temperature range of -20 degrees F to 105 degrees F makes it appropriate for installations in unconditioned mechanical spaces, utility rooms, and equipment closets where ambient temperatures vary seasonally.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e20 VA rating supports standard residential HVAC control loads\u003c\/li\u003e\n  \u003cli\u003e120 volt AC primary input with 27 volt open-circuit secondary output\u003c\/li\u003e\n  \u003cli\u003eFoot-mount configuration for panel or bracket installation\u003c\/li\u003e\n  \u003cli\u003eLeadwire connections on both primary and secondary sides\u003c\/li\u003e\n  \u003cli\u003eMetal end bells included for mechanical protection\u003c\/li\u003e\n  \u003cli\u003eMeets NEC Class 2 (not wet) and conforms to UL Standard 1585; CSA Certified A and B models\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or new-installation transformer for residential and light commercial HVAC control systems requiring a 120 volt AC primary, 24 volt AC secondary, 20 VA foot-mounted transformer.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a licensed HVAC technician or qualified electrician in accordance with NEC Class 2 wiring requirements. De-energize the circuit at the breaker before connecting or replacing this transformer. Verify that the total connected control load does not exceed the 20 VA rating before powering the circuit. This transformer is rated for indoor, not-wet locations only.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVA Rating\u003c\/strong\u003e: 20 VA\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary Input Voltage\u003c\/strong\u003e: 120 volts AC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSecondary Open Circuit Voltage\u003c\/strong\u003e: 27 volts AC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFrequency\u003c\/strong\u003e: 60 Hz\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary Connection Size\u003c\/strong\u003e: 9 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSecondary Connection Size\u003c\/strong\u003e: 9 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSecondary Connection Type\u003c\/strong\u003e: Leadwires\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAmbient Operating Temperature (Min)\u003c\/strong\u003e: -20 degrees F\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAmbient Operating Temperature (Max)\u003c\/strong\u003e: 105 degrees F\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNEMA Rating\u003c\/strong\u003e: None\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApprovals and Standards\u003c\/strong\u003e: NEC Class 2, UL Standard 1585, CSA Certified A and B models\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIncludes\u003c\/strong\u003e: Metal end bells\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColor\u003c\/strong\u003e: Black, Metallic\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWarranty\u003c\/strong\u003e: 1 Year\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: RESIDEO\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: at120b1028\/u\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"RESIDEO","offers":[{"title":"Default Title","offer_id":51138812215602,"sku":"AT120B1028\/U","price":37.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/305532930.jpg?v=1778263828","url":"https:\/\/voomisupply.com\/products\/resideo-at120b1028-u-foot-mounted-transformer-20-va","provider":"Voomi Supply","version":"1.0","type":"link"}