Is via Imax logic circuit supplied with the actual peak value of the three phase currents.

If the preset value (0,5-2,0 X In) is exceeded the time unit is activated.

When the preset time has expired (0,3-30 sec.) either the non-essential part of the load or the generator will be tripped by means of the output relay.

In case of current drop below the preset value, the time unit will immediately be reset.