Electrical relays - Part 3: Single input energizing quantity measuring relays with dependent or independent time
|Publication Date:||1 September 1992|
|ICS Code (Relays):||29.120.70|
Scope and object
This standard is applicable to electrical measuring relays and protection equipment having a single input energizing quantity and where the operating time is independent or dependent on this quantity.
The object of this standard is to state particular requirement for these relays.
It excludes thermal electrical relays which are specified in IEC 255-8 (1978), first edition.
These requirement supplement those specified in higher level document of the 255 series.