... fidelity waveformProtectOvervoltage ,overcurrent,feed phasesGeneralThis series large power voltage stabilizer is an energy-saving new product developed by our ... and four-wire system,the output voltage is 220V of phase and 380V of line voltage,Within the rated capacity ... equipment of which the source voltage is single-phase 220V or three-phase 380V. DPR SPR three-phase avr voltage regulator/stabilizer