A Low Voltage DC Relay is an electrically operated switch that uses an electromagnetic coil to control the opening and closing of a set of contacts. When a low-voltage DC signal is applied to the coil, it generates a magnetic field that activates the relay's mechanical switch. The contacts then close or open, allowing the relay to control high-power circuits without directly connecting them to the low-voltage control system. The primary advantage of using relays in these systems is that they isolate the low-voltage control circuit from the high-voltage load, preventing potential damage to sensitive components.