This standard is Electrical relays; part 3: single input energizing quantity measuring relays with dependent or independent time; Corrigendum 1.
IEC 60255-3/COR1:1992 history
1970IEC 60255-3:1989/COR1:1992 Corrigendum 1 - Electrical relays - Part 3: Single input energizing quantity measuring relays with dependent or independent time
1989IEC 60255-3:1989 Electrical relays; part 3: single input energizing quantity measuring relays with dependent or independent time
1970IEC 60255-3:1971 Electrical relays - Part 3: Single input energizing quantity measuring relays with non-specified time or with independent specified time