- 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
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Supco 902 Series General Purpose Fan Relay
|Price:||$2.99 - $14.25|
The Supco 902 series fan relays receive and control electrical signals for ... See more product details
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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.
|Contacts||SPST-NO, SPST-NC, SPDT, 1 NO/1 NC|
|Contact material||Silver 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 rating||24, 120, 208/240, 77VAC, 12, 24|
|Coil frequency||50/60 Hz|
|Coil pick-up voltage||AC 85% of nominal, DC 75% of nominal|
|Coil power rating||AD 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.
Top Customer Reviews
I did put some heat shrink on the second set of contacts.....
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 ›
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 *.
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.
Of all the components I've bought in those years - this is the lowest quality - and DOES NOT WORK.
- Circuit diagram on box is flat-out wrong as to which terminals are "closed" when coil energized.
- Relay buzzes very loudly when engaged (to the point it is unusable in my application,. It is L-O-U-D.
- The tabs for mounting are horrible. They have "score lines" implying a person can snap them off like on switches/outlets, but in fact you will have to saw them off.
- One of the screws to hold the case together (and to the mounting plate) was flat out missing.
It's a terrible product. No matter how desperate you might be for a product like this, you will be even more desperate if you purchase it and expect it to work.
So something kind to say..? It was cheap, and it won't take much room in the trash bin.
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...
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)
Most Recent Customer Reviews
Relay works as expected, but has a fairly noticable buzz when tripped to the on position.Published 4 hours ago by J. Cloyd
I bought this relay to bypass humidistat for my whole house humidifier, so that it will turn on once the furnace's fan is on. Read morePublished 11 days ago by yunner
Bought the 13 A 24v coil relay for controlling an auxiliary 6" blower that is tied to my air handler. It works as expected and seems to be made well enough.Published 14 days ago by Keith
Worked for a nest aprilaire 800 install. It's a relay it better just work. Plus was cheap and grainger is retarded overpricedPublished 26 days ago by Jeremy Lishman
I don't know if it works or not. This is not the product I receivedPublished 2 months ago by Russell L. Page, Jr.
I plugged this in directly to 24VAC and it's buzzing and vibrating so violently its not usable.Published 2 months ago by M. Benoit