DPDT relay is used to control electrical appliances. It has two parts - an input section that contains a coil and two pins that are connected to the input signal, and an output section that contains contactors. This type of relay has six contacts, two sets of three changeover contacts each. When the supply is off, the COM contact is connected to NC and when a power supply is present, the COM contact is connected to NO.

A DPDT relay can control four electrical circuits. It also has signal routing capabilities. The DPDT relay has two common terminals, the NC and the NO terminals. The input and output pairs are connected to separate coils. A DC bias attracts the levers on the common terminals, forming a circuit between the input and output terminals.

When the power supply to a relay is low, the coil does not get any power. However, when the switch is turned on, the coil is energized. This causes both contact sides of the relay to close, and the LEDs to illuminate together. A DPDT relay is typically used to control electrical equipment in homes.

The DPDT relay can control many different types of electrical appliances. A DPDT is more versatile than an SPDT in several ways. For example, it can control multiple appliances simultaneously. Another benefit of a DPDT is that it uses less current from the power supply. The higher the coil resistance, the less current it uses.