ITU-T K.135 PDF

This Recommendation applies to residual current devices (RCDs) with automatic reclosing (RCDAs) and provides an overview of parameters and testing methods. RCDAs are equipped with an automatic-reclosing feature, called trip-free functionality. This Recommendation also covers built-in RCDAs.

The following device parameters are covered:

• appearance and structure

• enclosure

• dielectric properties

• temperature rise

• operating characteristics

• mechanical and electrical life

• performance at short-circuit current

• test function of the device

• technical requirements for RCDs functionally dependent on line voltage

• working conditions upon over current of main circuits

• surge current performance

• technical requirements for automatic-reclosing devices

• environmental adaption.

This Recommendation does not cover:

• quality assurance requirements.

This Recommendation covers RCDs with automatic reclosing which are owned by network operators and under the supervision of skilled persons, and used within restricted access areas.

NOTE – If there is an inconsistency between a requirement in this Recommendation and a requirement of the domestic laws and regulations which relates to electrical safety, the requirement of the domestic laws and regulations shall take priority.