TTB7011, TTB7013, TTB7025, TTB7026 and TTB7027 constitute a complete range of instantaneous maximum or minimum DC voltage relays.

By their 2 and totally independent thresholds and the many possibilities of adjustment ranges they constitute, among other things, a solution for the following applications:

• Protection of networks with direct current from shunt sensor
• DC voltage measurement
• monitoring, from a shunt, of excitation overcurrent and undercurrent current of a synchronous machine