It owns automatic voltage detector that will protect circuit, either when it is overvoltage or undervoltage. It will reclose automatically as soon as the circuit returns normal voltage. This is a very perfect solution to real circuit fluctuates, as it is small size, and MCB is really reliable.

Instruction on front panel

Auto:HW-MN will inspect the line voltage aultomatically, and will trip when the voltage is either over or under normal rated voltage.