The function of relay:
A thermal relay is a device that helps protect motors and other equipment from getting too hot because of too much current. It works by using the heat from the current.
Here’s how it works:
1. Heating Element:
The thermal relay has a part that gets hot when current flows through it. The hotter it gets the more current is flowing.
2. Bimetallic Strip:
There is a strip attached to the hot part. This strip is made of two kinds of metal that expand at rates when heated. When it gets hot the strip bends.
3. Trigger Mechanism:
As the strip bends it eventually triggers a mechanism that opens the relay contacts. This stops the flow and protects the equipment.
4. Resetting:
After the relay stops working and cools down the strip goes back to its shape. Some thermal relays start working on their own while others need to be reset manually.
5. Adjustable Settings:
Many thermal relays have settings that can be adjusted. This allows the trip point to be set to the needs of the system being protected.
Thermal relays are used a lot because they are simple work well and protect against overload conditions. Thermal relays are good, at protecting equipment.
They help prevent damage from much current.
