scope:

This standard states the test and measurement procedures for electromechanical all-or-nothing relays within the scope of the IEC. It covers basic considerations which are, in general, common to all types of relays covered by IEC Publication 255, Electrical Relays, and is of particular interest for all-or-nothing relays of assessed quality. Supplementary requirements may be necessitated by specific designs or application. This standard will be extended by other tests intended more specifically for electromechanical all-or-nothing relays, with specified time. The object of this standard is to state, for electromechanical all-or-nothing relays: - special terms and definitions used and - test and measurement procedures.