HVAC Training Board: How To Check A General Purpose Switching Relay With A Multi Meter Using Voltage 

HVAC Training Board: How To Check A General Purpose Switching HVAC Relay With Voltage Using A Multi Meter (Relay Troubleshooting) HVACR TRAINING BOARD
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HVACR: General Purpose Switching Relays EXPLAINED (How It Works)
• HVACR: General Purpose...
HVAC/R: What is a control RELAY and how does it work?
• HVAC/R: What is a cont...
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The MARS Series 903 switching relays are intended for many applications in air conditioning, refrigeration, and heating. Other uses include general purpose switching in appliances, fan controls, and vending machines. Our relays are available in 24, 110/120, and 208/240 coil voltages with various
combinations of power and pilot duty contacts.
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.
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.
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