Why do high voltage DC relays have ceramic seals
June 16, 2023
Why do high voltage DC relays have ceramic seals
1. High voltage DC relay should be sealed with ceramic in order to obtain a vacuum environment, and more secure.
Ceramic vacuum relay is a ceramic vacuum seal. The contact point of the relay is sealed and isolated from the outside air to obtain high voltage resistance. It is used in high voltage circuits. The vacuum seal makes the relay not easy to produce arc. In an ideal state, the vacuum may reach the dielectric strength of 10000V per 0.1mm. In addition, because there is no air, the contact will not be oxidized in the vacuum, so the contact resistance of the vacuum relay is small and stable. Especially suitable for radio-frequency applications. A typical ceramic vacuum relay consists of four basic parts: a sealed arc extinguisher chamber, where the contact point is located to withstand high pressure. Armature mechanism that drives the movement of a moving contact. The part of the coil that provides power. Additional parts for easy installation and connection by the user.
2. Because there is no air, contacts in vacuum will not be oxidized, so the contact resistance of vacuum relay is small and stable. Especially suitable for radio-frequency applications.
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