A voltage stabilizer’s role is to protect low-voltage electrical appliances from damage by providing a consistent and stable output voltage, even when the input voltage fluctuates. It achieves this by regulating or boosting the voltage to a required level, ensuring appliances operate efficiently and last longer by preventing harm from over-voltage (high voltage) or under-voltage (low voltage).

Key roles:
Protection from power fluctuations: Stabilizers protect appliances from damage caused by sudden changes in the power supply, such as surges or brownouts.
Boosting low voltage: When the incoming voltage is too low, a stabilizer “boosts” it to the correct level, preventing appliances like refrigerators from overheating or working inefficiently, says V-Guard and Aulten.
Preventing over-voltage: It “bucks” or reduces the voltage when it’s too high, which prevents damage to the appliance’s insulation and components.
Improving efficiency and performance: By ensuring a steady voltage, stabilizers allow appliances to run at their optimal performance levels. This can lead to more efficient cooling in air conditioners or brighter, more consistent light from bulbs, according to Daikcell India and Electrosheriff.
Extending appliance lifespan: By preventing the wear and tear caused by unstable voltage, stabilizers help prolong the life of connected appliances, reducing the need for repairs and saving money in the long run, notes Right Power Tech.