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[Relay finder 6013.8024 Socket](https://www.automation24.ir/product-502/%D8%B1%D9%84%D9%87-%D9%81%D B%8C%D9%86%D8%AF%D8%B1-6013.8024--%D8%B3%D9%88%DA%A9%D8%AA)
What is a relay?
In a very simple way, it can be said that a relay is an electromechanical switch whose contacts change state when the coil is stimulated. Relays consist of two parts that are completely independent from each other. The first part, which is actually the relay coil, which can exist independently of the relay base or in a compact form, and the second part of the relay, which is the same as the relay base.
Relays are widely used in the industry today, relays are mostly used in control circuits, almost all the devices used in the industry have been used either openly or covertly. One of the advantages of the relay is that it can be used to obtain high power output with very low power. In other words, it can be said that the relay is considered as an amplifier because the input with low current and the output with high current can be received from it. Depending on the type of construction, the relay has 2 bases for feeding the coil and one or more COM (common) blades, one or more closed blades (NC) and one or more open blades (NO).
One of the important applications of relays can be in using the PLC output path. Because the PLC outputs that exist as relays inside the CPU, it is possible that if they are connected directly to the consumer, they will be defective due to current draw. As a result, the output of the PLC is connected to the coil of an external relay and the consumer is stimulated by the blades of the external relay. The good thing about this is that if something happens to the consumer, the external relay is damaged, in which case the relay can be easily replaced, but if the PLC's internal relay is faulty, it cannot be repaired easily.
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## ** Parts of the relay: **
spring
Coil to magnetize the blades
Contact blades
iron core
Note) Relays used to be mostly made electro-mechanically, but today, with the advancement of technology, electronic relays, including SSR relays, etc., have also been made.
### Things to know when buying a relay:
Relay coil excitation voltage and current
Tolerable voltage of contacts
The number of blades
Appearance of the relay
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