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
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| 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 | – | – |
