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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
ContactsDPDTCoil voltage24, 110/12, 208/240TerminalspowerContact power ratings12 FLA and 60 LRA at 120V6 FLA, 15 RA, and 35 LRA at 277V
Horsepower: 3/4Contact 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.
StatusPrime
Reviewed in the United States on August 28, 2024
Quick replacement part, works like it should.
Charles fritz Jr.
Reviewed in the United States on July 6, 2024
Did what I needed it to do no complaints
Jeff & Liza
Reviewed in the United States on March 18, 2024
Works perfectly
Outdoor Woodburner Service
Reviewed in the United States on December 4, 2024
work well
LB
Reviewed in the United States on January 3, 2024
It does the job it’s supposed to do, no problems. Instructions are lacking but if you know what you’re doing then no problem.To clarify, as the description is lacking, this is a DPDT relay. It fan be wired NO or NC or Both! So if you need a NO relay on pins 1, 2, 4, 6 then this is one to get.
Beckey B.
Reviewed in the United States on September 2, 2023
This worked to fix the relay on my air conditioning system.
Carmen
Reviewed in the United States on July 6, 2023
works great, fast shipping,THANK YOU!!!!!!
Cvg
Reviewed in Canada on July 17, 2023
Works perfectly, exact same as original.
Customer
Reviewed in Canada on February 3, 2022
Fit perfect to replace in my furnace
michel saumier
Reviewed in Canada on January 11, 2021
Bon substitué pour un remplacement
jean guy
Reviewed in Canada on February 13, 2020
utiliser pour un trans fer de voltage
Roy Grant
Reviewed in Canada on December 9, 2020
Good value
AT
Reviewed in the United States on November 18, 2014
Great relay at a great price. Nice for wiring things like lights and fountains which is what I used it for. You can use standard size crimp on spade connectors to attach the wires to it make it very easy to install. I misread the schematic at first but that was easily correctly. Nice heavy duty relay and contacts will handle a substantial load.
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