This standard describes certain electrical@ dimensional@ and mechanical characteristics and takes into consideration certain safety features of three-phase@ 60 Hz@ low-voltage (600 V and below) network protectors. They are used for automatically connecting and disconnecting a network transformer from a secondary spot or grid network.
IEEE C57.12.44-2005 history
1970IEEE C57.12.44-2014 IEEE Standard Requirements for Secondary Network Protectors
2005IEEE C57.12.44-2005 Standard Requirements for Secondary Network Protectors
2000IEEE C57.12.44-2000 Standard Requirements for Secondary Network Protectors
1994IEEE C57.12.44-1994 Standard Requirements for Secondary Network Protectors