An Autotransformer is an electrical transformer with only one winding. The winding has at least three electrical connection points called taps.

Single Phase Vari-O-Stat takes the input from 240 V - 50 Hz AC line and the output can be varied from 0 - 270 V. Single phase Vari-O-Stat are available in projection Mounting and Flush Mounting types. For better cooling, Vari-O-Stat of rating above 30 amps are made in oil - cooled construction. Output of these Vari-O-Stat can be varied from 0 to 270 V input being 240 V - 50 Hz AC.

Ganged Assemblies of 3 coils, connected in star are available for 3 phase supply. Contact arm of these coils are connected to common shaft. 3 Phase Vari-O-Stat takes the input from 415 V - 50 Hz AC and the output can be varied from 0 to 470 V. For better cooling, 3 phase Vari-O-Stat of rating above 30 amps are supplied in oil cooled construction. The input of this Vari-O-Stat is 415 V - 50 Hz 3 phase AC and the output can be varied form 0 to 470 V. Now we provide roller carbon brush assembly for long term trouble free operation of Variac in range of 40 Amp. & above