Which class of valve-type arrestors is rated for up to 42 kV?

The distribution class of valve-type arrestors is specifically designed to handle voltage levels up to 42 kV, making it suitable for protecting distribution lines and equipment from over-voltage transients. These arrestors are critical in maintaining system reliability and preventing damage to electrical installations. Their rating allows them to effectively suppress lightning strikes and switching surges that are common in distribution networks.

The characteristics of distribution class arrestors include their ability to handle medium voltage applications, ensuring they operate effectively in environments where the voltage may fluctuate but stays within the defined limits. They are built to provide robust performance under various electrical stress conditions while maintaining a balance between size and protective capabilities.

In contrast, other classes like station class arrestors are rated for much higher voltages, such as those used at substations, while secondary class arrestors are typically rated for lower voltage applications. Intermediate class arrestors, depending on their design, may also not reach the same upper limits as their distribution counterparts. This distinction is vital for linemen and electricians in selecting the appropriate protective devices for specific applications and ensuring equipment longevity and safety in electrical systems.