When the three-phase maximum differential current is greater than 0.8 times the minimum operating current, the starting element of the ratio brake differential will act.
When the maximum differential current of the three phases is greater than 0.8 times the minimum action current, the starting element action of the ratio brake differential.
When the maximum three-phase differential current is greater than 0.8 times of the minimum operating current, the starting element of the ratio braking differential acts.