Description

• Relays are most commonly used switching device in electronics.
• Before we proceed with the circuit to drive the relay we have to consider two important parameter of the relay. 
• Trigger Voltage is the voltage required to turn on the relay that is to change the contact from Common->NC to Common->NO.
•  The other parameter is your Load Voltage & Current.
• This is the amount of voltage or current that the NC,NO or Common terminal of the relay could withstand.
• In our case for DC it is maximum of 30V and 10A.
• Make sure the load you are using falls into this range. 

• The above circuit shows a bare-minimum concept for a relay to operate.
• Since the relay has 5V trigger voltage we have used a 5V DC supply to one end of the coil and the other end to ground through a switch.
• This switch can be anything from a small transistor to a micro-controller or a microprocessor which can perform switching operating.
• You can also notice a diode connected across the coil of the relay, this diode is called the Fly back Diode.
• The purpose of the diode is to protect the switch from high voltage spike that can produced by the relay coil.
• As shown one end of the load can be connected to the Common pin and the other end is either connected to NO or NC.
• If connected to NO the load remains disconnected before trigger and if connected to NC the load remains connected before trigger.

Relay 5V 5 Pin DatasheetPackage Included:

• 1 X Relay 5V 5 Pin