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How to use a clamp meter to measure inrush current Inrush current effect is common in electric motors. Sometimes, in case of ill-designed electrical wiring systems, switching on the motor may activate the fuse. It is caused by the inrush current – when the motor starts, it takes the current much higher than the regular operating current or than the motor which is in a stable working mode. The effect is rather short-lasting. For example, for a 3-phase motor it lasts ...