High-power electrical products made by applying the principle of electromagnetic coil induction. Inductive load electrical appliances generally include motors (such as electric drills and other power tools) and compression pumps (such as water pumps/air pumps/refrigerators/air conditioners/compressors/cranes, etc.). When we start these products, the current of the loads is about 3-10 times than working current, i.e. the peak power is large). For example, for a 350W electric drill, the peak power at startup is 4 times, 350*4=1400W