--- product_id: 26411246 title: "Emerson 90 380 Fan Relay 24 Volt Coil, 1" brand: "white-rodgers" price: "AR$57391" currency: ARS in_stock: true reviews_count: 13 category: "White Rodgers" url: https://www.desertcart.com.ar/products/26411246-emerson-90-380-fan-relay-24-volt-coil-1 store_origin: AR region: Argentina --- # 90A heavy-duty current rating Distinctive brick-red fireproof casing Universal mounting, operates any position Emerson 90 380 Fan Relay 24 Volt Coil, 1 **Brand:** white-rodgers **Price:** AR$57391 **Availability:** ✅ In Stock ## Summary > 🔥 Upgrade your HVAC game with Emerson’s rock-solid relay! ## Quick Answers - **What is this?** Emerson 90 380 Fan Relay 24 Volt Coil, 1 by white-rodgers - **How much does it cost?** AR$57391 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/26411246-emerson-90-380-fan-relay-24-volt-coil-1) ## Best For - white-rodgers enthusiasts ## Why This Product - Trusted white-rodgers brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built to Last:** Heavy-duty relay designed for multi-season reliability - • **Easy Integration:** Wall-mount design and simple wiring for quick setup - • **Fireproof & Silent:** Nonflammable brick-red casing ensures safety with minimal noise - • **Powerhouse Performance:** Handles up to 90 amps for robust HVAC control - • **Seamless Compatibility:** Works flawlessly with Nest and millivolt systems ## Overview The Emerson 90-380 Fan Relay features a 24V coil and a heavy-duty 90-amp silver contact rating, designed for reliable, quiet operation in HVAC systems. Its fireproof brick-red casing provides enhanced safety, while its universal mounting and compatibility with modern thermostats like Nest make it an essential upgrade for millennial professionals seeking dependable climate control solutions. ## Description Fan relays are built to perform quietly, reliably and economically for applications involving: air conditioning, heating, appliance, Fan control and general purpose switching operates in any position heavy-duty general purpose relay operates in any position. Review: Easy way to make Nest Thermostat work with a millivolt system! - Update - December 2022: This relay worked reliably for roughly 3.5 heating seasons. Recently, there were two separate instances where it would audibly click when my thermostat came on but the boiler side wasn’t being connected. I tested the boiler wiring directly and it fired up immediately. Since the relay appeared to be the most likely culprit, I replaced it with a spare one I had which immediately worked as expected. I’m satisfied for how long it lasted. I would recommend buying 2 at a time to just always have a spare if you’re ever using it for something like a Nest. The original seemed to fail when the heat was cycling more than usual as well. Guessing it sped up what was inevitable. Otherwise, my original rating still applies. These are simple and easy to use with a pretty decent lifespan. —————— Original Review - October 2019 This little relay is cheap but quality. I got this to use in tandem with a 24v hardwired transformer to control my millivolt boiler. Since my current system had no C wire and was just the Rh/W wires to turn the heat on, I couldn't just plug in my Nest. After some research, it seemed like the safest way to add a 24v power supply would be to use a transformer and a relay. Some tutorials claim plugging in the two transformer wires into the C and Rc ports on the Nest will get it to work (which it will) but you run the risk of the Nest sending the 24V of power down to your millivolt system which would not be good. To get around that, I wired up my transformer then ran the Rh wire to the thermostat and the W wire from the thermostat to this relay on the control end then back to the transformer to complete the circuit. Then just plugged in the Red and White wires coming from my boiler into the controlled side of the relay. Completely eliminated the possibility of the two different voltages crossing and messing anything up on my ancient heating system. I also ran an additional wire for the C and Rc ports to provide continuous power but that's not necessary in this setup, just peace of mind for me. Now that it's been getting cold, this relay has been tested without a problem. The Nest kicks on to call for heat and the relay gives a reliable click with the heat kicking on immediately. Just keep in mind this is a physical relay so the click is going to pretty audible. If you don't want to hear it, put it somewhere tucked away. If you're not a fan, you can find a solid state relay that should do the same thing. Review: Solid alternative to the OEM relay at half price - Relay had gone bad on my blower to heat pump. This was half the price of the OEM one. This one works fine and blower works again. ## Features - Fan Relay Heavy-Duty Single Pole Nor Open - Brick-Red Color | Nonflammable | Provides A Fireproof Acoustic Seal - This Is Manufactured In United States - Brand Name: Emerson Thermostats ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000LDCPQS | | Best Sellers Rank | #274,694 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #130 in Solid State Relays | | Brand | White-Rodgers | | Brand Name | White-Rodgers | | Coil Voltage | 24 Volts | | Connector Type | Connector_type | | Contact Current Rating | 90 Amps | | Contact Material | Silver | | Contact Type | Switching | | Current Rating | 90 Amps | | Customer Reviews | 4.7 out of 5 stars 1,398 Reviews | | Global Trade Identification Number | 00786710028366 | | Included Components | White Rodgers 90-380 Fan Relay 24 Volt Coil | | Item Type Name | White Rodgers 90-380 Fan Relay 24 Volt Coil | | Item Weight | 0.1 Pounds | | Manufacturer | White Rodgers | | Maximum Switching Voltage | 24 Volts | | Minimum Switching Voltage | 24 Volts (DC) | | Model | 90-380 | | Mounting Type | Wall Mount | | Number of Terminals | 1 | | Operation Mode | operation | | Part Number | 90-380 | | Specification Met | UL | | UPC | 095801794906 786710028366 | | Unit Count | 1.0 Count | | Wattage | 2.16 watts | ## Product Details - **Connector Type:** Connector_type - **Contact Material:** Silver - **Contact Type:** Switching - **Current Rating:** 90 Amps - **Mounting Type:** Wall Mount ## Images ![Emerson 90 380 Fan Relay 24 Volt Coil, 1 - Image 1](https://m.media-amazon.com/images/I/61S6BADdycL.jpg) ![Emerson 90 380 Fan Relay 24 Volt Coil, 1 - Image 2](https://m.media-amazon.com/images/I/510yz2imrWL.jpg) ## Questions & Answers **Q: How much current does the coil draw?** A: From Mouser website: Coil Resistance: 77 Ohms, Coil Current: 125 mA **Q: My old relay shows: coil24vac, 14fla 84lra 125vac, 8fla 48lra 277vac, and 25a, 277vac res. can i use this to replace mine?** A: No, the amperage ratings on this relay are lower than the one you are trying to replace. The 90-380 relay has these specs: 12 Amps. Continuous, 60 Amps. Inrush @ 125 VAC 8 Amps. Continuous, 48 Amps. Inrush @ 250 VAC 18 Amps. Continuous @ 277 VAC FLA is Full Load Amps, "Continuous" LRA is Locked Rotor Amps **Q: I only have 4 wires on my ac unit will this relay still work?** A: Really can't answer that without more details. If your four wires are two for the coil and two for the fan, then yes but... terminals 1&3 are the coil terminals 2&4 are the N.O. terminals 5&6 are the N.C. **Q: With the leads to the coil energized with 24v the relay just buzzes; no switching happens. Does this mean I received a defective relay?** A: If you connect the 24VDC version in a system that needs a 24VAC relay, the AC will cause the DC coil to buzz and will fail to function. Make sure you get the 24VAC version in a system that uses AC on the coil side. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Easy way to make Nest Thermostat work with a millivolt system! *by C***. on October 6, 2019* Update - December 2022: This relay worked reliably for roughly 3.5 heating seasons. Recently, there were two separate instances where it would audibly click when my thermostat came on but the boiler side wasn’t being connected. I tested the boiler wiring directly and it fired up immediately. Since the relay appeared to be the most likely culprit, I replaced it with a spare one I had which immediately worked as expected. I’m satisfied for how long it lasted. I would recommend buying 2 at a time to just always have a spare if you’re ever using it for something like a Nest. The original seemed to fail when the heat was cycling more than usual as well. Guessing it sped up what was inevitable. Otherwise, my original rating still applies. These are simple and easy to use with a pretty decent lifespan. —————— Original Review - October 2019 This little relay is cheap but quality. I got this to use in tandem with a 24v hardwired transformer to control my millivolt boiler. Since my current system had no C wire and was just the Rh/W wires to turn the heat on, I couldn't just plug in my Nest. After some research, it seemed like the safest way to add a 24v power supply would be to use a transformer and a relay. Some tutorials claim plugging in the two transformer wires into the C and Rc ports on the Nest will get it to work (which it will) but you run the risk of the Nest sending the 24V of power down to your millivolt system which would not be good. To get around that, I wired up my transformer then ran the Rh wire to the thermostat and the W wire from the thermostat to this relay on the control end then back to the transformer to complete the circuit. Then just plugged in the Red and White wires coming from my boiler into the controlled side of the relay. Completely eliminated the possibility of the two different voltages crossing and messing anything up on my ancient heating system. I also ran an additional wire for the C and Rc ports to provide continuous power but that's not necessary in this setup, just peace of mind for me. Now that it's been getting cold, this relay has been tested without a problem. The Nest kicks on to call for heat and the relay gives a reliable click with the heat kicking on immediately. Just keep in mind this is a physical relay so the click is going to pretty audible. If you don't want to hear it, put it somewhere tucked away. If you're not a fan, you can find a solid state relay that should do the same thing. ### ⭐⭐⭐⭐⭐ Solid alternative to the OEM relay at half price *by F***B on May 3, 2025* Relay had gone bad on my blower to heat pump. This was half the price of the OEM one. This one works fine and blower works again. ### ⭐⭐⭐⭐⭐ Great for connecting a smart thermostat to a millivolt stove *by M***N on February 23, 2025* Used this relay in conjunction with a transformer to power a Nest thermostat that controls a millivolt Vermont Casting propane stove. Works perfectly. The stove wires connect to the load side on the bottom two tangs. The white wire from the thermostat (switched) connects to one side of the power on the relay and a wire from the transformer connects to the other. Then a blue and red wire from the transformer connect to common and R on the nest. ## Frequently Bought Together - Emerson 90 380 Fan Relay 24 Volt Coil, 1 - Hotop 1 Pack 24 Volt Transformer, 40 VA AC Transformer Plug in with PTC Fuse Competible with All Versions of Ring Doorbell and Thermostat, Compatible with Nest, Ecobee, Sensi, Honeywell, 24V Adapter - 24VAC 40VA Plug in Transformer,Doorbell Transformer Compatible with All of Doorbell，Nest, Ecobee, Sensi and Honeywell Thermostat --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.com.ar/products/26411246-emerson-90-380-fan-relay-24-volt-coil-1](https://www.desertcart.com.ar/products/26411246-emerson-90-380-fan-relay-24-volt-coil-1) --- *Product available on Desertcart Argentina* *Store origin: AR* *Last updated: 2026-05-20*