Relay - 12 Volt

Key Features:-

1. Coil Voltage (12V): The relay is designed to operate with a 12V DC (direct current) supply voltage. Applying a 12V voltage to the relay's coil terminals activates the relay.

2. Contact Pins: A 5-pin relay has five pins or terminals, which are typically labeled as follows:

   • Coil+ (or +12V): This pin is connected to the positive terminal of the 12V power supply to energize the relay coil.
   • Coil- (or GND): This pin is connected to the ground or negative terminal of the power supply.
   • Common (COM): This is the common terminal of the relay's switching contacts. It connects to one of the other pins depending on whether the relay is normally open (NO) or normally closed (NC).
   • Normally Open (NO): This pin connects to COM when the relay is energized, creating a normally open switch contact that closes when the relay activates.
   • Normally Closed (NC): This pin connects to COM when the relay is not energized, creating a normally closed switch contact that opens when the relay activates.

Functionality:

The primary function of a 5-pin relay is to control the flow of electrical current between the common (COM) pin and either the normally open (NO) or normally closed (NC) pin. When you apply a 12V voltage to the coil pins (+12V and GND), the coil becomes magnetized, causing the relay's internal switch contacts to change state.

• In a normally open (NO) relay, the common (COM) pin is connected to the normally closed (NC) pin when the relay is de-energized. When the relay is energized, the connection switches to the normally open (NO) pin.
• In a normally closed (NC) relay, the common (COM) pin is connected to the normally open (NO) pin when the relay is de-energized. When the relay is energized, the connection switches to the normally closed (NC) pin.