All WI Line devices are self-powered time overcurrent relays, which means they take their energy from
the current transformers. Since they do not require auxilliary power, the WI Line Relays are well suited for
use in self-sustaining transfer and distribution stations, local grids, and ring-main-units.
Tripping characteristics range from two-stage, independent (DE FT) and dependent (IN V) time overcurrent
protection, up to special characteristic curves. As further options, we offer some relays with
integrated earth fault protection


Device WIC1-xPE WIP1-x-I-E WIP1-2/3 WIM1-C WIB1-2-xE
Documentation Manual Manual Manual Manual ———
Type Line WI WI WI WI WI
Current Transformer Inputs 3 4 4 3 3
Binary inputs 1 3 3 1
Inputs relay 2 2 3
Watchdog relay 1 1
Pulse output 2 2 2 2 3
50/51 Overcurrent time protection Yes Yes Yes Yes Yes
50N/51N Ground protection Yes Yes Yes Yes
Reset / Block Yes Yes
Time data Yes Yes
Parameters 1 1 1 1
Error messages Yes Yes Yes Yes
Matrix relay output Yes
RS485 Open Data Protocol Optional
Modbus RTU Protokol Optional
Profibus DP Optional