You may not know it but you are always on guard, monitoring for risks, ready to respond at the request of a moment. Millions of years of evolution have put your brain to work to save your flesh when the simplest risk threatens your survival. An example is if one of your eyelashes detects a threat, it will send a warning to your brain, which will cause your eyelids to lock in a flash. In all manner of computers and electronic devices, where sensors are able to turn stuff on or off in a fraction of a second, you will see the same trick at work using smart magnetic switches or relays. 

What Is A Relay?

You may think of a relay as a kind of electric lever: turn it on with a tiny current and use a much bigger current to turn to another gadget. Most devices are extremely fragile electronic equipment components and can contain tiny electrical currents. Relays cross the distance, allowing for the triggering of larger ones by small currents. Which ensures that the relays will act as switches or amplifiers. Omron relays are the most chosen for their safety use and cost.

G6B-4BND DC24 - Omron Electronic Components - RELAY, 4PST-NO, 250VAC

How Is Relay Used?

Suppose you decide to create an electronically controlled cooling system that turns a ventilator on or off when the temperature changes in your house. You might use some sort of electronic thermometer circuit to feel the temperature, but that would only generate tiny electrical currents which will be far too low to control the electric motor in a huge big fan. You might link the circuit of the thermometer to a relay’s input circuit, instead. In this circuit, as a small current flows, the relay activates the output circuit, causing a much greater current to flow and turn the fan on.

Relays don’t often turn things on; sometimes they shut things off very helpfully, occasionally. For example , you can find safety relays in power plant machinery and energy transmission lines that fly as faults occur to avoid harm from events like current surges.