1. Protective layer of contacts
Electrical Contacts are very important components in circuits and are responsible for conducting current. To protect contacts from oxidation, corrosion, and other factors, it is often necessary to add a protective layer to them.

2. Protective layer of copper
Copper is one of the common materials in circuits and is often used as a material for contacts. To prevent Electrical Solid Copper Contacts from oxidation and corrosion, it is often necessary to add a copper protective layer to them. The copper protective layer has excellent conductivity and can effectively conduct current, but the disadvantage is that it is easily oxidized and corroded, thereby reducing its conductivity.

3. Nickel-plated protective layer
Compared with the copper protective layer, the nickel-plated protective layer has better corrosion resistance and oxidation resistance, which can protect the nickel-plated contacts from corrosion and thus extend their service life. In addition, the nickel-plated protective layer can also increase the hardness and wear resistance of the contacts, making them more durable. However, relatively speaking, the cost of the nickel-plated protective layer is higher, so the copper protective layer may be selected in some low-cost products.
summary
The protective layer of the Electrical Contacts is a very important component in the circuit. Its function is to protect the contacts from oxidation, corrosion, and other factors, thereby extending their service life. The copper protective layer and nickel-plated protective layer are common contact protective layers. The difference between the two is that the nickel-plated protective layer has better corrosion resistance, but is more expensive than copper.
