Three-phase NSN voltage stabilizers based on OPTIMUM stabilizers
The three-phase AC voltage stabilizer is designed for voltage correction in industrial and household power supply networks with a nominal voltage of 380 volts.
The three-phase voltage stabilizer is built on the basis of three single-phase NSN stabilizers connected according to the "star" scheme with a mandatory input neutral. The output voltage for the stabilizer is phase (phase-zero), not line voltage.

I provide the stabilizer

stabilization of the output phase voltage at the level of 220 V, with a frequency of 50 Hz;
automatic disconnection from the network when the input phase voltage rises above the upper limit of the input voltage;
the undistorted form of the sinusoidal output voltage;
operation in the entire range of loads from idling to maximum load;
protection against short circuit and long-term overload at the output;
"transit" mode in an emergency situation;
protection of consumers from overvoltage in the "transit" mode at 265 V (at 445 V linear);
autotransformer thermal protection;
disconnection of consumers in the event of a short-term disappearance of the power network (precludes damage to impulse power sources of consumers);
input phase voltage display;
automatic disconnection from the network when one of the phases is lost, to protect three-phase electric motors.
The three-phase voltage stabilizer consists of three independent HSN stabilizers assembled and switched in one housing. Structurally, the stabilizer is made in a metal case, which allows you to operate it in the floor version. On the front panel there are LCD indicators showing (by default) the level of input and output voltage, current and stage number.
If there is no need for voltage stabilization or if the stabilizer malfunctions, the device can be turned off with the available "stabilization-transit" switch.
Functionally, each separate unit is a single-phase voltage stabilizer consisting of an autotransformer, powerful triac switches, a voltage controller with protection against overcurrent consumed by the load.