Features of Single Channel 5V Relay Board:

LED Indication of Relay ON.
Direct input from 3-5V Microcontroller for relay control.
Output terminal for relay contacts.
Provision of 2?3 pin male header for wire connection.
Powered from external 5V or from male header.

Applications of Single Channel 5V Relay Board:

Electromagnetic relays are employed for the protection of various ac and dc equipments.
The over/under current and voltage protection of various ac and dc equipments.
For differential protection.
Device switching.
Multiple DIY projects.