OMRON provides General-purpose Relays, I/O Relays, Power Relays, Latching Relays, and Ratchet Relays.
Overview of General-purpose Relays
What Are Relays?
To get an idea of what relays are, think of a children's athletic carnival.
Little A holds on tightly to the baton and passes it to the Big B.
This is a relay.
Now lets look at a more technical example.
Think of turning on a television with a remote control.