A capacitive sensor array includes a sensor electrode, a shielding electrode and a background electrode which are surrounded by insulator materials and connected to a control and evaluation circuit. The sensor electrode detects the entry of an object into a space ahead of the sensor electrode. The control and evaluation circuit detects a capacity change of the sensor electrode as compared to a reference potential. The shielding electrode is connected to the sensor electrode via the control and evaluation circuit in such a manner that its potential follows. The three electrodes are arranged behind each other. The insulating materials are arrayed between the sensor electrode and the detection zone and include at least one plastic layer that directly surrounds the sensor electrode and a plastic layer.