By LED (red) with the dials on the panel may provide a functional operation instructions and current. When the electric current (In) and overcurrent set current (Is) are the same, the red LED will begin to flash. This also provides a method for accurately measuring motor current: When the motor current (In) exceeds the set (Is) the red LED flashes emerging indicator value is the time of the motor (In) the value of the relay action, red LED status lights will remain on until the relay until reset, operation indication of multifunction relays and contactors, is also an important feature.