As the executive component that controls the on and off of each high-voltage circuit, the high-voltage DC relay is an important guarantee for the safety of electric vehicles. It is also widely used in the photovoltaic and energy storage fields. As the core component of the high-voltage DC relay, the contact material has received widespread attention. So what kind of contacts does the high-voltage DC relay use?
By analyzing the mainstream high-voltage DC relays on the market, it is found that they are mainly composed of two static contacts and one moving contact. The moving contact is generally a contact bridge, and the material of the contact is tellurium copper. Because the base material of the automotive relay must not only have high strength, high temperature resistance and good fatigue strength, but also solve the arc problem during the closing and disconnection of the relay contact, by adding tellurium elements (Te) to copper, the arc extinguishing effect can be effectively achieved.
However, the conductivity of tellurium copper is slightly lower than that of red copper. In order to reduce contact resistance and improve conductivity, some manufacturers will silver-plate the contacts.
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Post time: Aug-19-2024