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  • Supco 903 Series General Purpose Switching Relay
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by Supco

Supco 903 Series General Purpose Switching Relay

Available in multiple versions


Price: $7.49 - $9.95
Product Specifications
Brand Name Supco
UNSPSC Code 39122300

This Supco 903 series switching relay receives and controls electrical sign... Read full product description


Currently showing 1-3 of 3
Size Name Part Number Price Quantity
   
110/120 V Coil Voltage, Double Pole Double Throw Contacts, B0071NAWQG
In Stock (19)
$7.83
Prime Eligible
208/240 V Coil Voltage, Double Pole Double Throw Contacts, B0071NAXNS
In Stock (5)
$8.59
Prime Eligible
24 V Coil Voltage, Double Pole Double Throw Contacts , B004XS1ZT0
In Stock (6)
$7.50
Prime Eligible
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Product Features

  • Switching relay for receiving and controlling electric signals
  • DPDT for simple changeover switching
  • UL recognized for safety, and CSA certified for quality assurance
  • Suitable for use in HVAC/R, vending machines, fan controls and business machine applications

Product Details

  • Shipping Information: View shipping rates and policies
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • ASIN: B0071OXAPU
  • Average Customer Review: 3.9 out of 5 stars  See all reviews (8 customer reviews)
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Product Description

This Supco 903 series switching relay receives and controls electrical signals for general purpose applications. This switching relay has double pole double throw contacts and is suitable for use in heating, air conditioning and refrigeration applications, appliance vending machines, fan controls and business machines.

Specifications
ContactsDPDT
Coil voltage24, 110/12, 208/240
Terminalspower
Contact power ratings12 FLA and 60 LRA at 120V
6 FLA, 15 RA, and 35 LRA at 277V
Horsepower: 3/4
Contact pilot ratings3 RA
Horsepower: 1/10

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 Reviews

3.9 out of 5 stars
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Most Helpful Customer Reviews

3 of 3 people found the following review helpful By Samuel Moyed on July 14, 2012
Size Name: 110/120 V Coil Voltage, Double Pole Double Throw Contacts, Verified Purchase
I bought this relay to switch DC battery current to a bell when AC power fails, ie to function as a power failure alarm.

Unfortunately, when the relay is continuously energized, it overheats and buzzes loudly. Oh, well.
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2 of 2 people found the following review helpful By S. Greene on December 27, 2013
Size Name: 110/120 V Coil Voltage, Double Pole Double Throw Contacts,
Well, this is a long time coming. I put a booster fan on my houses HVAC system as the master bedroom didn't get the air flow the rest of the house did. Initial install I used a Suncourt DS100 DuctStat Plug-In Thermostat, but it never seemed to turn on early enough and ran on longer than the normal HVAC fan (no matter how I set the t-stat), so I have always wanted to use a relay to turn the booster fan on and off with the normal HVAC fan. So I did a little research and looked like this relay would work for me.
I just hooked it up today and it has only cycled a few times but the booster fan turns on and off with the HVAC Fan! So success!
Just FYI the 90341 is a 120v relay meaning it powers things that are 120v and the coil/switching requires 120v's to cycle the relay

To get more info on the relay go here [...]
if you select the downloads tab you can get a pdf of the relays specs and you'll see Terminals 1 & 2, 4 & 5 are normally closed
Terminals 1 & 3, 4 & 6 are normally open. I call the 7 & 8 and they are for the coil/switching doesn't matter which gets which but the need a +120v and a -120v.
Hope that helps some and know that you may need a 24v coil relay if your getting your switching source from your thermostat or something in your HVAC that is after a 120v to 24v transformer.
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3 of 3 people found the following review helpful By Cre8er on November 30, 2013
Size Name: 110/120 V Coil Voltage, Double Pole Double Throw Contacts,
For Those looking for data on this relay:
It is a 12Amp (15amp Resistive) Light Duty relay (not continuous duty cycle)
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1 of 1 people found the following review helpful By K. Connell on July 13, 2014
Size Name: 110/120 V Coil Voltage, Double Pole Double Throw Contacts, Verified Purchase
Working fine (continuous duty for last month) but it is a tad noisy.
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