FIELD: electrical engineering. SUBSTANCE: gear protects multiphase using equipment against injury if one of phases disappears. Gear is placed between neutral of using equipment and zero wire. In this case relay is connected to bridge rectifier through stabilizer diode. Voltage of stabilization in chosen higher than amplitude of voltage between neutral and zero wire under rated condition which reduces consumption of energy. Second stabilizer diode placed in parallel to relay is selected with voltage of stabilization equal to rated working voltage of relay. EFFECT: enhanced efficiency of protection. 1 dwg
