AC mains voltage fluctuations can cause equipment to behave erratically and malfunction.
Some systems may even break down due to fluctuations, noise or spikes.
Computers, Office Equipment, Telecom Equipment, Industrial Control Systems, as well as many other
key applications and services are totally dependent on the power quality of the source.
This is why Automatic Voltage Regulators are today, in many areas of our life, considered absolutely essential.