Relay Shields

solenoid

Overview

A relay, as its name suggests, passes on (relays) a signal, they are categorized like switches that separates high voltage devices from low voltage devices. It contains a coil of wire wrapped around an iron core. When electricity runs though the coil, the iron core exerts a magnetic force, which pulls a lever, which pushes or pulls a springy strip of metal, closing two contacts. So as long as electricity runs though the coil, the relay is “energized” and its contacts remain closed. When the power stops passing though the coil, the relay lets go and the springy strip of metal snaps back into its original position, opening the contacts.

We use relays for high current applications where a switch may burn out under high current. Also relays can be controlled electrically whereas switches can be only operated mechanically.

 

Health & safety

  • Ensure you are familiar with all H&S rules that apply to the environment you are working in.
  • Identify where first aid can be found in your work space
  • Keep all components dry and free from liquid spillages
  • To avoid static, make sure your work surface is sufficiently earthed