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HVACR: General Purpose Switching Relays EXPLAINED (How It Works) Everything You Need To Know 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 circu