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by Supco

Supco 902 Series General Purpose Fan Relay

Available in multiple versions


Price: $5.84 - $12.06
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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1 A Load Current, 24 V Coil Voltage, Single Pole Double Throw Contacts B0071NAT64
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1 A Load Current, 240 V Coil Voltage, Single Pole Double Throw Contacts B0071NAUX6
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12 A Load Current, 120 V Coil Voltage, Single Pole Double Throw Contacts B0071NAYUU
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12 A Load Current, 24 V Coil Voltage, Single Pole Double Throw Contacts B004XS148C
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12 A Load Current, 240 V Coil Voltage, Single Pole Double Throw Contacts B0071NAZT0
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13 A Load Current, 24 V Coil Voltage, Normally Open and Normally Closed Contacts B004XS1ZX6
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13 A Load Current, 240 V Coil Voltage, Normally Open and Normally Closed Contacts B0071NB34G
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18 A Load Current, 120 V Coil Voltage, Normally Open and Normally Closed Contacts B0071NB12K
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4 A Load Current, 24 V Coil Voltage, Single Pole Single Throw Contacts B0002YTM30
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4 A Load Current, 240 V Coil Voltage, Single Pole Single Throw Contacts B0071NAQ58
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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: 4.0 out of 5 stars  See all reviews (60 customer reviews)
  • Product Warranty: For warranty information about this product, please click here

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Product Description

The Supco 902 series fan relays receive and control electrical signals for general purpose fan applications. This fan relay has SPST-NO, SPST-NC, SPDT-NO/NC contacts made of silver alloy and coil voltage ratings of 24VAC to 240VAC. It is suitable for use in fan applications.

Specifications
ContactsSPST-NO, SPST-NC, SPDT, 1 NO/1 NC
Contact materialSilver alloy
Power ratings (all forms)125VAC, 18 amp resistive, 12 FLA, 60 LRA, 240/277VAC, 18 amp resistive, 8 FLA, 48 LRA
Special power ratings (form 1 and 2)125VAC, 14 FLA, 84 LRA, 277VAC, 25 amp resistive
Pilot ratings (all forms)3 amp, 277VAC general purpose
250VA at 250VAC
277VA at 277VAC
125VA at 125VAC
Coil voltage rating24, 120, 208/240, 77VAC, 12, 24
Coil frequency50/60 Hz
Coil pick-up voltageAC 85% of nominal, DC 75% of nominal
Coil power ratingAD DC, Inrush 5VA 3VA, Sealed 3VA 3VA

Relay switches (also called an electrical relay or an electrical relay switch) use a small amount of power to control a larger source of power connected to electrical devices such as car motors, computers, and lighting installations. A basic relay switch has a control circuit with an electromagnetic coil and a load circuit with contacts and a lever. When current flows into the relay switch, it moves through the coil and a magnetic field is created, which causes the lever in the load circuit to move between contacts, either turning the device on or off. In a normally open (NO) relay switch, when power is supplied to the relay, the load circuit is closed and the power source connected to the relay is turned on. In a normally closed (NC) relay switch, when power is supplied to the relay, the load circuit is open and the power source connected to the relay is turned off. In other types of relay switches, non-moving parts such as transistors or semiconductors can be used as the control circuit to operate the switching mechanism. Relay switches can be controlled with an external switch, such as a light switch, or they can be connected to an automatically switched power source, such as a car ignition. One relay can operate multiple switches, and multiple relays can be operated with a single switch, with each relay operating independently from the other relays in the system.

Supco manufactures test instruments and replacement parts for heating, ventilation, air conditioning, and refrigeration systems. The company, founded in 1945, is headquartered in Allenwood, NJ.


Customer Questions & Answers

Customer Reviews

4.0 out of 5 stars

Most Helpful Customer Reviews

3 of 3 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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1 of 1 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 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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1 of 1 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 3 people found the following review helpful By GATADIESEL on June 23, 2012
Size: 13 A Load Current, 24 V Coil Voltage, Normally Open and Normally Closed Contacts Verified Purchase
The fan relay in my air handler went out. Being a recently relocated HVAC tech, I couldn't find any parts houses near my new home and I am not currently employed, so I couldn't borrow one from my boss...so I came on Amazon. I was amazed to see this part as prime eligible...it was getting hot and two day shipping was great.

This relay works with a majority (not ALL) air handlers w/ electric heat, utilizing a relay instead of a control board. The normally closed contacts are for whats called a "fan-interlock". This is wired to the heat strips so that when they engage, the blower fan engages if the fan relay fails to switch the normally open contacts closed. A big safety factor and very important when buying a replacement fan relay. If the fan fails to engage when the heat strips come on, you have a big fire hazard - granted, most systems are equipped with high-limit switches now-a-days, but its good to be doubly safe.

If you are unsure what you need, save yourself from possible property damage or loss of life - call a HVAC tech.
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1 of 1 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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By MD90 on October 23, 2014
Size: 12 A Load Current, 24 V Coil Voltage, Single Pole Double Throw Contacts Verified Purchase
Nice simple relay with good mounting options. The form-c setup allows me to correct my retarded furnace control that runs the draft inducer motor while the AC is on (blowing my dry conditioned cool air outside during the summer). I can now cut power to the draft inducer when the AC kicks on. If it ever goes bad, it's dirt cheap and can be swapped out in less than a minute.
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By Brad Lane on July 6, 2014
Size: 18 A Load Current, 120 V Coil Voltage, Normally Open and Normally Closed Contacts Verified Purchase
Thank You!
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