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** [k705-2220vac socket KMY2S](https://www.automation24.ir/product-3740/%D8%B1%d9%84%d9%87-%da%A9% D8%a7%da%a9%d9%86-K7052220vac-25d8%d9%d9%da%A9%d8%AA-KMY2S) **
### What is a relay:
It can be easily said that the relay is an electromechanical key that changes its contacts by stimulating its contacts. The relays are made up of two parts that are completely independent. The first part, which is actually a relay, which can be independent of the relay base or compact, and the second part of the relay, which is the relay base.
Relays are widely used in the industry today, the relays are mostly used in steering circuits, almost all the equipment used in the industry, whether explicit or hidden, has been used. One of the advantages of the relay is that it can get high power output with very low power. In other words, it can be said that the relay is also a amplifier because the input with low current and high current output can be received. Depending on their construction, the relay has two stands for boobin feeding and one or more com (subscriber) and one or more packs (NC) and one or more open blades (NO).
One of the most important uses of relay can be to use the PLC output path. Because the PLC outputs that exist as a relay inside the CPU may be defective if they are connected directly to the consumer. As a result, the PLC output is attached to the coil of an external relay and stimulates the consumer's external relay blades. The good thing is that if something happens to the consumer, the exterior relay can be easily replaced, but it cannot be easily repaired if the internal relay is defective.
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## Relay Parts phrase:
1. Spring
2. The coil to magnetize the blades
3. The contact blades
4. Iron core
Tip) Relays were previously made more electro -mechanical, but today with the advancement of epicronic relays technology, including SSR relay and so on.
## the items to know when buying a relay:
1. Voltage and flow of stimulating relay.
2. The tolerable voltage of contacts
3. The number of blades
4. The appearance of the relay
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