The AD-LW 110 GVC monitors the load condition of inductive loads. The main application is asynchronous motors in the 1- or 3-phase network, the load of which is greatly changed. The device makes an evaluation of the cos-phi value and an undervoltage monitoring. Exceeding the set limit values triggers a contact. The switching states are indicated on the front side by LEDs. The measuring principle for the cos-phi is based on the evaluation of the phase shift between voltage and current in one phase. The actual measured variable is therefore the phase angle between voltage and current. The setting value of the cos-phi or of the phase angle is therefore only correct for sinusoidal quantities. The phase shift is almost inverse to the load. A cos-phi of 0 (= 90 °) thus corresponds to a low load while a cos-phi of 1 (= 0 °) corresponds to a large load. An external current transformer can be connected to the current input of the device. Thanks to the integrated, efficient switching power supply, operation is possible in a wide supply voltage range.