When I bought my electrical appliances, I bought the voltas stabilizer along with these appliances, During warranty period it worked well. But after this, relay and switching circuit had blown. I called to voltas customer care, they told me that 300-400 service charges would be applicable. This stabilizer had only one year of warranty period while other company’s stabilizers in the market have at least 2-3 Yrs of Warranty,
then I had to go to market and made it repaired from market itself on the cost of 500 Rs. Again after some time, it got some problem again and I again made it repaired. Overall not to buy Voltas stabilizers at all. you can go with Microtech or V - Guard.