INVA electronic voltage stabilizer HIAS 4000 model comes with an inbuilt transformer. This model is suitable for inverter type AC up to 1.5 ton. Hykon INVA voltage stabilizer can protect AC from power fluctuations and outages. It provides enhanced protection against over-voltage, low voltage, and over-temperature cutoff. Keeping the AC safe from voltage fluctuations will also improve the efficiency and durability of the product. The LED indication on the stabilizer displays Input On, Output On, and Output Cutoff.