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  • Supco 902 Series General Purpose Fan Relay
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by Supco

Supco 902 Series General Purpose Fan Relay

Available in multiple versions

66 customer reviews

Price: $5.60 - $12.92
Product Specifications
Brand Name Supco
UNSPSC Code 39122300

The Supco 902 series fan relays receive and control electrical signals for ... Read full product description


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1 A Load Current, 120 V Coil Voltage, Single Pole Double Throw Contacts B0071NATZU
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$7.50
1 A Load Current, 24 V Coil Voltage, Single Pole Double Throw Contacts B0071NAT64
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$10.93
1 A Load Current, 240 V Coil Voltage, Single Pole Double Throw Contacts B0071NAUX6
In Stock (5)
$12.92
12 A Load Current, 120 V Coil Voltage, Single Pole Double Throw Contacts B0071NAYUU
In Stock (10)
$8.25
12 A Load Current, 24 V Coil Voltage, Single Pole Double Throw Contacts B004XS148C
In Stock (56)
$5.84
12 A Load Current, 240 V Coil Voltage, Single Pole Double Throw Contacts B0071NAZT0
In Stock (4)
$8.25
13 A Load Current, 24 V Coil Voltage, Normally Open and Normally Closed Contacts B004XS1ZX6
In Stock (96)
$5.60
13 A Load Current, 240 V Coil Voltage, Normally Open and Normally Closed Contacts B0071NB34G
In Stock (3)
$8.25
18 A Load Current, 120 V Coil Voltage, Normally Open and Normally Closed Contacts B0071NB12K
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$8.25
4 A Load Current, 24 V Coil Voltage, Single Pole Single Throw Contacts B0002YTM30
Usually ships in 2 to 4 weeks
$11.04
4 A Load Current, 240 V Coil Voltage, Single Pole Single Throw Contacts B0071NAQ58
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$6.34
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Product Features

  • Electric relay for receiving and controlling electric signals
  • Controls signals for a fan
  • SPST-NO, SPST-NC, SPDT 1 NO/1 NC contact forms
  • Sealed enclosure

Product Details

  • Shipping Information: View shipping rates and policies
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B0071OX6Z4
  • Average Customer Review: 4.1 out of 5 stars  See all reviews (66 customer reviews)
  • Product Warranty: For warranty information about this product, please click here

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Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

4 of 4 people found the following review helpful By D Garden on April 22, 2013
Size: 13 A Load Current, 24 V Coil Voltage, Normally Open and Normally Closed Contacts Verified Purchase
I'm using the relay with my humidifier and NEST thermostat setup. Works great.... There is no buzzing like other comments.

I did put some heat shrink on the second set of contacts.....
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2 of 2 people found the following review helpful By Lifted Jeep on April 7, 2014
Size: 12 A Load Current, 24 V Coil Voltage, Single Pole Double Throw Contacts Verified Purchase
It's a relay. Works just as described.

Coil runs off 24VAC for use in HVAC systems. I used this to wire my Humidifier to my Nest. Was easier to wire it to switch my 120v lines on the HUM transformer.

There is a standard terminal hole in my HVAC that mounts the HUM transformer 24v lines outside with both 120v lines inside. So I attached the white to an open neutral line on the HVAC control board. The black went to the Normally Open terminal on the relay. Relay Common ties to the 120v line in the HVAC. The relay coil attaches one side to the HVAC 24v common and the other is coming from the nest thermostat wire attached to *.

Relay terminals:
1=24v Common
2=HUM transformer 120v hot(black)
3=Nest wire connected to *
4=HVAC 120v hot(black)

Note: Mine came with no blade for terminal 6. Though terminal 4 & 6 are tied together internally. Also the schematic looked different on mine confusing me for a few minutes.
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1 of 1 people found the following review helpful By TJ092561 on June 29, 2015
Size: 12 A Load Current, 24 V Coil Voltage, Single Pole Double Throw Contacts Verified Purchase
Purchased this Packard PTD102 timer along with Supco relay - http://www.amazon.com/gp/product/B004XS148C?redirect=true&ref_=cm_cr_ryp_prd_ttl_sol_4 ...and a Honeywell thermostat - http://www.amazon.com/gp/product/B007BHLUWM?redirect=true&ref_=cm_cr_ryp_prd_ttl_sol_3
I wired these into the furnace control circuit (very easy to do) so the furnace blower turns ON via the thermostat and sends the signal to this Packard timer. This timer then turns on the Supco relay that supplies 120 volts to a small window air conditioner (5,000 BTU).
I have the window air conditioner in the basement near the furnace and made a sheet metal duct to direct the dry, chilled air from the air conditioner into the duct work. The furnace blower grabs the air and distributes the cool, dry air throughout the house and it is now very, very comfortable (and inexpensive) for central air - in Michigan muggy summer. Never exceeds 73 degrees, and very low humidity in the home. Sister loves it.
Calculated usage puts the worst case $$ at $0.14 per hour (960 watts) for the window A/C and furnace blower fan. Even if it ran for 24 hours/day...that's just $100/month. All from a $120 window air conditioner and about another $80 in parts :)
I know, I know...they say you should only cool 150 square feet of space with these little air conditioners...but this is the second time I've done this. The first one is in it's second summer in ultra-humid Spartanburg, South Carolina. I use the Haier brand without any electronic controls...just basic mechanical thermostat that is built in to it...and set it on MAX COOL - http://www.amazon.com/AMERICA-TRADING-HWF05XCL-Conditioner-5000-BTU/dp/B00BDRXN30/ref=sr_1_3?ie=UTF8&qid=1435615912&sr=8-3&keywords=haier+air+conditioner ( I buy these from another big-box for $120).
Read more ›
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2 of 2 people found the following review helpful By Esteban A. Valle on January 31, 2015
Size: 12 A Load Current, 24 V Coil Voltage, Single Pole Double Throw Contacts Verified Purchase
Works great. It's a relay. Not much else to say. I'm using this to support a Nest thermostat on a millivolt system, and it is working fine with a trigger voltage of 24vAC and milliamp current to the coil.
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2 of 2 people found the following review helpful By Tony Ranieri on February 6, 2014
Size: 13 A Load Current, 24 V Coil Voltage, Normally Open and Normally Closed Contacts Verified Purchase
Worked like a champ for my nest with humidifier setup. I had to route via my humidistat, I thought I could bypass that panel but I was wrong. This was a great value and works good.
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2 of 2 people found the following review helpful By Bennett Giesler on December 29, 2013
Size: 18 A Load Current, 120 V Coil Voltage, Normally Open and Normally Closed Contacts Verified Purchase
Have no complaints with this unit. Is quiet and has been reliable. Been using to control a duct booster with my furnace blower.
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1 of 1 people found the following review helpful By David T on May 29, 2015
Size: 18 A Load Current, 120 V Coil Voltage, Normally Open and Normally Closed Contacts Verified Purchase
Nice relay.
I used to make a flip / flop box, with 2 15 amp receptacles:
one 'ON' and the other 'OFF' when the relay IS receiving it's trigger signal, then-
the first 'OFF' and the other 'ON' wneh the relay ISN'T receiving it's trigger signal...

For example-
use a small lamp timer and this relay to control a larger A/C unit (when timer on) then attic or basement fan (when timer off)

It would've been nice if the terminals were drilled for passing wire through,
They are not.
but instead I wrapped the wire around the terminal, then solder it directly.
(I don't like "crimp" connectors for carrying more than 2-3 amps)
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Size: 12 A Load Current, 24 V Coil Voltage, Single Pole Double Throw Contacts Verified Purchase
Relay worked perfectly for Nest Thermostat controlling a gas fireplace. I also had to install a 24VAC transformer. Very simple configuration:

1) The N/O switch contact side of the relay is connected across the gas fireplace switch leads.

2) Three wire, 18-gauge thermostat cable (red, white, and blue connected to RH, W, and C respectively on the Nest thermostat) was fished through the wall. The Nest was located a few feet from the fireplace about eye-level on the wall. Fishing the wire through the wall was the hardest part of this install.

3) Under the fireplace the wire is connected to the secondary 24VAC side of the transformer using the red RH power wire and the blue C common wire.

4) The relay coil is connected to the white (W) control wire from of the nest thermostat, with the other side connected to the blue C common wire. In my install, the transformer and relay were tucked underneath the gas fireplace a couple of inches apart.

5) Finally, the primary side of the transformer is fitted with a 120VAC cord (only needed to be about 8-inches long in my case) and plugged into 120VAC.

6) On my Nest Thermostat, I had to lie to the thermostat and configure it for "electrical heat" rather than "gas furnace" ... I think. I did this and it works. Read it someplace.

This is the 4th Nest Thermostat I have in my home but the only one on a gas fireplace, the other three are controlling two other furnaces, one with two zones, and no relay is required for those applications.

Shipping was very fast on this product and I have absolutely no complaints. Would buy again... in fact, I'm about to use another of these relays to control my whole-home humidifier... as soon as I can figure out hot to get the additional wire run to the nest. That's another project.
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