{"title":"HVAC Transformers","description":"\u003cp\u003eSingle-phase control transformers for HVAC equipment control circuits. VA ratings run 40, 48, 50, 75 and 100, with primaries covering 120 V, 208\/240 V, 240\/480 V, 277 V, and multi-tap 120-208-240 V and 120-208-240-480 V. Several list a 24 V secondary.\u003c\/p\u003e\u003cp\u003eSize the transformer to the total VA draw of everything on the secondary — contactor coil, gas valve, thermostat, damper motor, condensate pump — not to the one component that failed. 40 VA is the most stocked size here, but adding a zone panel or a powered humidifier can push a control circuit past it. Multi-tap primaries let a single part cover 120, 208 and 240 V equipment, and in the 75 VA multi-tap, 480 V as well. Brands include TRADEPRO, MARS, JARD, Beckett, Honeywell Home and AprilAire.\u003c\/p\u003e","products":[{"product_id":"tradepro-tp-40va-a-728804","title":"TRADEPRO® Transformer Single Phase 120-208-240\/24V 40VA TP-40VA-A","description":"\u003cp\u003eTRADEPRO® TP-40VA-A is a transformer. Control transformers step line voltage down to the low-voltage control circuit used by thermostats and contactors.\u003c\/p\u003e\u003ctable class=\"hb-spec\"\u003e\n\u003ctr\u003e\n\u003cth\u003ePhase\u003c\/th\u003e\n\u003ctd\u003eSingle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency\u003c\/th\u003e\n\u003ctd\u003e50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eKHM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"TRADEPRO®","offers":[{"title":"Default Title","offer_id":52234728308952,"sku":"TP-40VA-A","price":33.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8725\/6536\/files\/tradepro_tp-40va-a_article_1604089255984570_en_normal.jpg?v=1786655866"},{"product_id":"tradepro-tp-40va-24181","title":"TRADEPRO® Transformer Single Phase 120-208-240\/24V 40VA TP-40VA","description":"\u003cp\u003eTRADEPRO® TP-40VA is a transformer. Control transformers step line voltage down to the low-voltage control circuit used by thermostats and contactors.\u003c\/p\u003e\u003ctable class=\"hb-spec\"\u003e\n\u003ctr\u003e\n\u003cth\u003ePhase\u003c\/th\u003e\n\u003ctd\u003eSingle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency\u003c\/th\u003e\n\u003ctd\u003e50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eCHN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"TRADEPRO®","offers":[{"title":"Default Title","offer_id":52234728407256,"sku":"TP-40VA","price":33.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8725\/6536\/files\/tradepro_tp-40va_article_1374780284946_en_normal.jpg?v=1786655870"},{"product_id":"tradepro-tp-75va-multi-24184","title":"TRADEPRO® Transformer Single Phase 120-208-240-480\/24V 75VA TP-75VA-MULTI","description":"\u003cp\u003eTRADEPRO® TP-75VA-MULTI is a transformer. Control transformers step line voltage down to the low-voltage control circuit used by thermostats and contactors.\u003c\/p\u003e\u003ctable class=\"hb-spec\"\u003e\n\u003ctr\u003e\n\u003cth\u003ePhase\u003c\/th\u003e\n\u003ctd\u003eSingle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency\u003c\/th\u003e\n\u003ctd\u003e50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eCHN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"TRADEPRO®","offers":[{"title":"Default Title","offer_id":52234729717976,"sku":"TP-75VA-MULTI","price":60.44,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8725\/6536\/files\/tradepro_tp-75va-multi_article_1374780285011_en_normal.jpg?v=1786655910"},{"product_id":"tradepro-tp-40va-qc-383871","title":"TRADEPRO® Transformer Single Phase 120-208-240\/24V 40VA Quick Connect TP-40VA-QC","description":"\u003cp\u003eTRADEPRO® TP-40VA-QC is a transformer. Control transformers step line voltage down to the low-voltage control circuit used by thermostats and contactors.\u003c\/p\u003e\u003ctable class=\"hb-spec\"\u003e\n\u003ctr\u003e\n\u003cth\u003eControl Voltage\u003c\/th\u003e\n\u003ctd\u003e24 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePhase\u003c\/th\u003e\n\u003ctd\u003eSingle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency\u003c\/th\u003e\n\u003ctd\u003e50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eCHN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"TRADEPRO®","offers":[{"title":"Default Title","offer_id":52234732372184,"sku":"TP-40VA-QC","price":22.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8725\/6536\/files\/tradepro_tp-40va-qc_article_1476466785624_en_normal.jpg?v=1786655975"},{"product_id":"tradepro-tp-50va-24182","title":"TRADEPRO® Transformer Single Phase 120-208-240\/24V 50VA TP-50VA","description":"\u003cp\u003eTRADEPRO® TP-50VA is a transformer. Control transformers step line voltage down to the low-voltage control circuit used by thermostats and contactors.\u003c\/p\u003e\u003ctable class=\"hb-spec\"\u003e\n\u003ctr\u003e\n\u003cth\u003ePhase\u003c\/th\u003e\n\u003ctd\u003eSingle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency\u003c\/th\u003e\n\u003ctd\u003e50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eCHN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"TRADEPRO®","offers":[{"title":"Default Title","offer_id":52234732404952,"sku":"TP-50VA","price":45.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8725\/6536\/files\/tradepro_tp-50va_article_1448875864382_en_normal.jpg?v=1786655977"},{"product_id":"tradepro-tp-40va-qc-a-728805","title":"TRADEPRO® Transformer Single Phase 120-208-240\/24V 40VA TP-40VA-QC-A","description":"\u003cp\u003eTRADEPRO® TP-40VA-QC-A is a transformer. Control transformers step line voltage down to the low-voltage control circuit used by thermostats and contactors.\u003c\/p\u003e\u003ctable class=\"hb-spec\"\u003e\n\u003ctr\u003e\n\u003cth\u003ePhase\u003c\/th\u003e\n\u003ctd\u003eSingle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency\u003c\/th\u003e\n\u003ctd\u003e50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eKHM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"TRADEPRO®","offers":[{"title":"Default Title","offer_id":52234733748440,"sku":"TP-40VA-QC-A","price":22.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8725\/6536\/files\/tradepro_tp-40va-qc-a_article_1604089255986003_en_normal.jpg?v=1786656001"},{"product_id":"tradepro-tp-75va-multi-a-748804","title":"TRADEPRO® Transformer Single Phase 120-208-240-480\/24V 75VA TP-75VA-MULTI-A","description":"\u003cp\u003eTRADEPRO® TP-75VA-MULTI-A is a transformer. Control transformers step line voltage down to the low-voltage control circuit used by thermostats and contactors.\u003c\/p\u003e\u003ctable class=\"hb-spec\"\u003e\n\u003ctr\u003e\n\u003cth\u003ePhase\u003c\/th\u003e\n\u003ctd\u003eSingle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency\u003c\/th\u003e\n\u003ctd\u003e50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eKHM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"TRADEPRO®","offers":[{"title":"Default Title","offer_id":52234733846744,"sku":"TP-75VA-MULTI-A","price":60.44,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8725\/6536\/files\/tradepro_tp-75va-multi-a_article_1604089255985114_en_normal.jpg?v=1786656005"},{"product_id":"tradepro-tp-50va-a-733722","title":"TRADEPRO® Transformer Single Phase 120-208-240\/24V 50VA TP-50VA-A","description":"\u003cp\u003eTRADEPRO® TP-50VA-A is a transformer. Control transformers step line voltage down to the low-voltage control circuit used by thermostats and contactors.\u003c\/p\u003e\u003ctable class=\"hb-spec\"\u003e\n\u003ctr\u003e\n\u003cth\u003ePhase\u003c\/th\u003e\n\u003ctd\u003eSingle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency\u003c\/th\u003e\n\u003ctd\u003e50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eKHM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"TRADEPRO®","offers":[{"title":"Default Title","offer_id":52234734436568,"sku":"TP-50VA-A","price":45.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8725\/6536\/files\/tradepro_tp-50va-a_article_1604089255985958_en_normal.jpg?v=1786656024"},{"product_id":"mars-50354-210176","title":"MARS Transformer Single Phase 208\/240V 40VA 50354","description":"\u003cp\u003eMARS 50354 is a transformer. Control transformers step line voltage down to the low-voltage control circuit used by thermostats and contactors.\u003c\/p\u003e\u003ctable class=\"hb-spec\"\u003e\n\u003ctr\u003e\n\u003cth\u003ePhase\u003c\/th\u003e\n\u003ctd\u003eSingle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency\u003c\/th\u003e\n\u003ctd\u003e60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eCHN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"MARS","offers":[{"title":"Default Title","offer_id":52234736402648,"sku":"50354","price":28.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8725\/6536\/files\/mars_50354_article_1366804115375_en_normal.jpg?v=1786656084"},{"product_id":"mars-50321-65157","title":"MARS Transformer Single Phase 240\/480V 75VA 50321","description":"\u003cp\u003eMARS 50321 is a transformer. Control transformers step line voltage down to the low-voltage control circuit used by thermostats and contactors.\u003c\/p\u003e\u003ctable class=\"hb-spec\"\u003e\n\u003ctr\u003e\n\u003cth\u003ePhase\u003c\/th\u003e\n\u003ctd\u003eSingle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency\u003c\/th\u003e\n\u003ctd\u003e50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eCHN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"MARS","offers":[{"title":"Default Title","offer_id":52234741481688,"sku":"50321","price":121.62,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8725\/6536\/files\/mars_50321_article_1366804113704_en_normal.jpg?v=1786656241"},{"product_id":"jard-44504-240866","title":"JARD Transformer Single Phase 24V 40VA 44504","description":"\u003cp\u003eJARD 44504 is a transformer. Control transformers step line voltage down to the low-voltage control circuit used by thermostats and contactors.\u003c\/p\u003e\u003ctable class=\"hb-spec\"\u003e\n\u003ctr\u003e\n\u003cth\u003ePhase\u003c\/th\u003e\n\u003ctd\u003eSingle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency\u003c\/th\u003e\n\u003ctd\u003e50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eKOR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"JARD","offers":[{"title":"Default Title","offer_id":52234744430808,"sku":"44504","price":39.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8725\/6536\/files\/jard_44504_article_1366804113918_en_normal.jpg?v=1786656335"},{"product_id":"mars-50327-65158","title":"MARS Transformer Single Phase 240\/480V 50VA 50327","description":"\u003cp\u003eMARS 50327 is a transformer. Control transformers step line voltage down to the low-voltage control circuit used by thermostats and contactors.\u003c\/p\u003e\u003ctable class=\"hb-spec\"\u003e\n\u003ctr\u003e\n\u003cth\u003ePhase\u003c\/th\u003e\n\u003ctd\u003eSingle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency\u003c\/th\u003e\n\u003ctd\u003e50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eCHN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"MARS","offers":[{"title":"Default Title","offer_id":52234745053400,"sku":"50327","price":144.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8725\/6536\/files\/mars_50327_article_1366804118543_en_normal.jpg?v=1786656355"},{"product_id":"mars-50341-71195","title":"MARS Transformer Single Phase 240\/480V 100VA 50341","description":"\u003cp\u003eMARS 50341 is a transformer. Control transformers step line voltage down to the low-voltage control circuit used by thermostats and contactors.\u003c\/p\u003e\u003ctable class=\"hb-spec\"\u003e\n\u003ctr\u003e\n\u003cth\u003ePhase\u003c\/th\u003e\n\u003ctd\u003eSingle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency\u003c\/th\u003e\n\u003ctd\u003e50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eCHN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"MARS","offers":[{"title":"Default Title","offer_id":52234745282776,"sku":"50341","price":163.08,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8725\/6536\/files\/mars_50341_article_1366804116209_en_normal.jpg?v=1786656364"},{"product_id":"beckett-51771u-100171","title":"Beckett Transformer 120 VAC Single Phase 51771U","description":"\u003cp\u003eBeckett 51771U is a transformer. Control transformers step line voltage down to the low-voltage control circuit used by thermostats and contactors.\u003c\/p\u003e\u003ctable class=\"hb-spec\"\u003e\n\u003ctr\u003e\n\u003cth\u003eVoltage\u003c\/th\u003e\n\u003ctd\u003e120 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePhase\u003c\/th\u003e\n\u003ctd\u003eSingle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency\u003c\/th\u003e\n\u003ctd\u003e50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"Beckett","offers":[{"title":"Default Title","offer_id":52234745675992,"sku":"51771U","price":145.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8725\/6536\/files\/beckett_51771u_article_1489739502569_en_normal.jpg?v=1786656370"},{"product_id":"mars-50352-210175","title":"MARS Transformer Single Phase 120V 40VA 50352","description":"\u003cp\u003eMARS 50352 is a transformer. Control transformers step line voltage down to the low-voltage control circuit used by thermostats and contactors.\u003c\/p\u003e\u003ctable class=\"hb-spec\"\u003e\n\u003ctr\u003e\n\u003cth\u003ePhase\u003c\/th\u003e\n\u003ctd\u003eSingle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency\u003c\/th\u003e\n\u003ctd\u003e50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eCHN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"MARS","offers":[{"title":"Default Title","offer_id":52234746888408,"sku":"50352","price":56.74,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8725\/6536\/files\/mars_50352_article_1366804117535_en_normal.jpg?v=1786656383"},{"product_id":"jard-m44511-71004","title":"JARD Transformer 240\/480V 50VA M44511","description":"\u003cp\u003eJARD M44511 is a transformer. 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