Features of 8-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 8-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.