Three Phase Voltage Stabilizer has fully solid state circuit and has auto/ manual facility and in case of control card failure manual control of output is possible from front panel. The Stabilizer remains unaffected by load power factor and has the feature of zero waveform distortion and phase shift introduced in stabilizer. The Stabilizer has audio and visual indicators for over/ under voltage cut-off and ensures easy serviceability through plug in type PCB. The Stabilizer has output short circuit protection by circuit of mcb and under voltage trip setting of 295 V. The Stabilizer is available in rating from 3 KVA to 1000 KVA and has built-in analogue meter to monitor input and output voltages by means of selector switch. The Stabilizer has ambient temperature up to 50 ° c maximum and has output cut-off by means of relays/ contactors in each unit. The Three Phase Voltage Stabilizer has supply frequency from 47 to 55 Hz and has input short circuit protection by means of fuse.