The core principle of manganese copper shunt stealing electricity is to artificially change its resistance characteristics (such as adjusting the welding position or short circuiting), so that the voltage drop signal generated by the actual current is lower than the true value, resulting in the current data read by the metering chip being lower, thereby reducing electricity metering. Common methods include changing the welding points of the shunt or connecting shunt resistors in parallel to disrupt their normal connection with the current coil. ‌‌‌