3000 VA Single Phase Domestic Automatic Voltage Stabilizer from ATO has an input voltage range of 140V to 260V, which means if the input voltage is between 140V to 260V, it will stabilize it to regular voltage of about 220V-230V. If the voltage is below 140V or higher than 260V, it will just cut off the applicance from mains.
3 kVA Voltage Stabilizer Specifications
Tips: How to select a household voltage stabilizer
In this video ATO uses a voltage regulator and multimeter to test the output voltage of the 3 kva voltage stabilizer which has 140V to 270V AC input, 220V AC output. After testing, we may see that the output voltage is within 220V ± 6%, which is in line with the standard.