Static protection devices

Device ID Description
INH Overcurrent and earth-fault protection relay
IHS-1T Directional earth-fault relay
SZR Overcurrent relay
INO Overcurrent relay
INS-1T Directional overcurrent relay
DT23d DT33d Differential relays
ARN-6K Automatic voltage regulator
APU 311k Automatic reclosing device
UN, UP Voltage relays
RSK-80 Relay annunciator unit
RSK-84 Relay annunciator unit
KPK 10, KPK 103 Auxiliary circuit control relays
KPU 301 Capacitor storage unit
RTS Blinking light relay
BPK Protection workings counter
RSK 20 Relay unit