An SPDT (Single Pole Double Throw) relay functions as a switch for controlling high-current AC/DC appliances via a microcontroller or sensor output. Despite its compact size, the 5V PCB Mount Sugar Cube SPDT Relay can handle a load of up to 20A. It operates with a coil current of 200mA and requires a 5V trigger voltage.
This relay has five pins: Coil End 1, Coil End 2, COM (common), NC (Normally Closed), and NO (Normally Open). The coil ends are used to activate the relay, with one end connected to a 5V supply and the other to the ground. The COM pin connects to one side of the load. The other side of the load connects to either NC or NO. If connected to NC, the load remains ON until the relay is triggered. If connected to NO, the load stays OFF until triggered. These relays are commonly used in home automation, switching circuits, and security systems.
