Pure copper coil, not aluminum. Used Automatic Voltage Stabilizer 5000VA.
100% working
Model: CVR-TUB 5000VA
Input: AC 100V-260V
Output: AC 230V - 13A
Can carry 1.5HP AC, Big Freezer, Washing Machine. The Body is still very strong. Delay takes about 1 minute to enter In Use, then output is steady 220V. Turbo light is ON. Breaker is working fine. See live pictures.