UBZ-301 universal electromotor protection unit (further referred to as the unit) is designed for continuous monitoring of the circuit voltage parameters and phase/line RMS currents of three-phase 380V/50Hz electrical equipment, primarily, of induction asynchronous motors (EM) with wattage rating from 2.5kW up to 315kW, as well as those with isolated neutral line.UBZ-301 universal electromotor protection unit (further referred to as the unit) is d..