Precision AC servo controlled voltage stabilizer regulates the mains fluctuating voltage to deliver a very precise output voltage with a regulation of A+1% depending upon the rating of the stabilizer. The work of correction is automatic and synchronous with the help of an auto transformer (variac) and AC synchronous motor.

Sen & Pandit Electronics Private Limited also offers Servo Voltage Stabilisers for 3 phase systems. These usually have three single-phase servo stabilisers connected in STAR configuration for 3-phase application with individual sensing for each phase and to provide constant output in each phase even with unbalanced supply or unbalanced load.