Summary

Recommendation ITU-T K.135 provides an overview of the parameters of residual current operated protective devices with an automatic-reclosing feature for telecom applications.

Such devices with an automatic-reclosing feature (herein referred to as residual current devices with automatic reclosing (RCDAs)), also known as trip-free devices, are used in telecom applications based in central offices or in bureaux and/or stations. They are usually mounted as supplementary protection devices to other forms of protection against direct contact. The parameters reference built-in residual current operated protective devices with automatic-reclosing functionality.