WI Line

WI Line – self-powered time overcurrent relays

All relays from this line are self-powered time overcurrent relays, i.e. they take their energy from the current transformers. Since they do not require auxilliary power, they are well suited for use in self-sustaining transfer and distribution stations, local grids and ring-main-units.

The tripping characteristics range from two-stage, independent (DEFT) and dependent (INV) time overcurrent protection up to special characteristic curves. As further options, we offer some relays with integrated earth fault protection.Through close co-operation with our customers we have developed serial products, which match nearly any circuit breaker commonly available on the market.The electronic parts of the relays are completely sealed in. This makes the relays resistant to even the very worst environmental influences.