{"product_id":"tradepro-tp-90370-heavy-duty-spdt-fan-relay-24-vac","title":"TRADEPRO TP-90370 – Heavy-Duty SPDT Fan Relay (24 VAC)","description":"\u003ch1 data-pm-slice=\"1 3 []\"\u003eTRADEPRO TP-90370 – Heavy-Duty SPDT Fan Relay (24 VAC)\u003c\/h1\u003e\n\u003cp data-pm-slice=\"1 3 []\"\u003eThe \u003cstrong\u003eTRADEPRO® TP-90370\u003c\/strong\u003e is a professional-grade Single Pole Double Throw (SPDT) switching relay designed for reliable control of blower motors, fans, and auxiliary HVAC components. This relay allows a low-voltage \u003cstrong\u003e24 VAC\u003c\/strong\u003e control signal to safely manage higher voltage loads. As a critical link in the system's electrical sequence, it ensures that high-amperage components engage only when triggered by the thermostat or control board.\u003c\/p\u003e\n\u003cp\u003eConstructed for high-duty cycles, the TP-90370 features an enclosed design to protect electrical contacts from dust, moisture, and oxidation. The \u003cstrong\u003eSPDT configuration\u003c\/strong\u003e provides both Normally Open (NO) and Normally Closed (NC) circuits, offering versatile wiring options for two-speed fan applications or interlocking safety circuits. Choosing a TRADEPRO® relay ensures industrial-strength switching reliability and a long mechanical life.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features and Function:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePrecision 24V Control:\u003c\/strong\u003e Specifically tuned for standard 24 VAC HVAC control circuits to prevent sticking or failing to pull in.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDual-Circuit Flexibility:\u003c\/strong\u003e SPDT design allows for \"change-over\" switching between two different loads or speeds.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eQuiet \u0026amp; Reliable Operation:\u003c\/strong\u003e High-quality internal coil and contact points reduce mechanical hum and electrical arcing.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eUniversal Mounting:\u003c\/strong\u003e Features a heavy-duty mounting bracket designed to fit standard screw patterns in most furnace and air handler cabinets.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eProduct Details and Key Specifications:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e TP-90370 (MFG: HCRY51CQ1AB217)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturer:\u003c\/strong\u003e TRADEPRO®\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePart Type:\u003c\/strong\u003e General Purpose \/ Fan Switching Relay\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCoil Voltage:\u003c\/strong\u003e 24 VAC\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eContact Arrangement:\u003c\/strong\u003e SPDT (Single Pole Double Throw)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eContact Rating:\u003c\/strong\u003e 12A \/ 15A Res. @ 120V\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eTerminals:\u003c\/strong\u003e 1\/4\" Male Quick-Connects\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003e🛠️ HVAC Depot Pro Tip: The \"Speed-Switching\" Setup\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe TP-90370 is the \"go-to\" relay for adding a manual fan-on option to older systems. When wiring for two-speed control, ensure the \"Common\" terminal is securely seated. If you hear a loud buzzing, check your common wire connection; a loose terminal creates high resistance that can melt the plastic housing of the relay before the fuse even blows.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eCross-Reference \u0026amp; Compatibility:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe TP-90370 is a direct replacement for many industry-standard SPDT relays, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eMars:\u003c\/strong\u003e 90370, 90340\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHoneywell:\u003c\/strong\u003e R8222D1014\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhite-Rodgers:\u003c\/strong\u003e 90-370\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eZettler:\u003c\/strong\u003e AZ2280-1C-24AF\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDiversiTech:\u003c\/strong\u003e REL-370\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eExtensive Model Compatibility List:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eForced Air Systems:\u003c\/strong\u003e Used in residential and light commercial air handlers from Carrier, Goodman, York, and Nordyne.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSpecialty Controls:\u003c\/strong\u003e Compatible with electronic air cleaners, bypass humidifiers, and zone control panels.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TRADEPRO®","offers":[{"title":"Default Title","offer_id":52451519922539,"sku":"817506021381","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/90370.jpg?v=1775162224","url":"https:\/\/tophvacparts.com\/products\/tradepro-tp-90370-heavy-duty-spdt-fan-relay-24-vac","provider":"HVAC Parts and Equipment Depot","version":"1.0","type":"link"}