This Recommendation gives an overview of the parameters of residual current operated protective devices with automatic-reclosing feature for telecom applications. Such devices with an automatic-reclosing feature, also known as trip-free devices, are used in telecom applications based in central offices or in bureaux and/or stations (herein referred to as "RCDAs"). 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 (RCDA) functionality.