Inrush current

When power equipment is started, a current larger than normal flows due to the charging current of the capacitor inside the equipment. Due to transient phenomena, as the capacitor becomes charged, the current value decreases and settles to the normal value once fully charged. The maximum value of the input current from the startup of the power equipment until it reaches a steady state is called inrush current. Since inrush current can adversely affect power equipment, it often includes a safety function that limits the input current at startup.