Power Kavach is a protection device for problems such as neutral open or double phasing conditions. These are accidents for which there are no safeguards in industry whatsoever.
The device is designed to handle 440V in single phase for indefinite amount of time. Most equipment would burn at this voltage.
440V protector shuts the power supply to connected equipment such cases and when the voltage comes back to normal, the 440V protector switches ON again automatically.
In a normal day your equipment will experience 100-200 spikes that will damage your Equipment gradually over period of 3-4 years. Power Kavach will also absorb spikes in the system and bypass them to the ground