In three-phase equipment, if the supply voltage is low in any one phase and if you want to run the whole equipment correctly. This team will help you to rescue this situation. However, the appropriate classification fuse must be used in three phases, ie in the input lines R, Y and B. Where the correct voltage is available that time. Another low-voltage phase change to correct the voltage in the same way, to run all the equipment in the single phase in the building. The circuit consists of relay comparator, transformer.
Now, in the 21st century, the world is totally automation, and it is time to think about the control of microcontrollers. All automatic controller like remote controller, handheld communication devices, automatic and semi-automatic washing machine, auto indicating and measuring instruments have their use in each.