Time delay relays are those devices that can turn a device on or off at a specific time. Power relays, as they are also known, are one of the crucial parts of any electronic equipment.
Generally, power relays are solid-state, which is different from some of the mechanical relays found in very large electrical appliances such as in-phase power relays and circuit breakers in your home's electrical circuits. You can buy cost-effective timer relay switches via https://www.geya.net/timer-relay/.
Solid-state time delay relays are much more reliable than electromechanical ones, mainly because they have no moving parts which is why they are called solid.
A relay board will have an SSR, which contains one or more transistors. This is what causes the state change to go from on to off. Modern time delay relays can carry high electrical currents, which is very different from older relays.
One of the best things is that regardless of the type of electrical appliance you are talking about, a relay is always called a relay. Its function is to switch something from on to off. You might come across some other jargon, like normally closed and normally open, double-throw, and change over.
The double throw or change-over connects two circuits that are linked. The switch you use so easily on a relay board basically flips the pole between normally closed and normally open or basically on to off.
The exact function provided by the switches on your specific relay board will depend on the application you are using. They can, for example, increase the amount of energy provided to something with a weak energy source. They can also be used to control different circuits in the way they interact with each other.