Switch activated by a movement sensor

The invention proposes a sensor switch (11) with a first sensor (5) which reacts to movement and has a first monitored detection (sensing) range (12) in which there is additionally provided a second sensor (8) which reacts to infrared beams (rays) and has a second monitored detection range (13). The second detection range is situated inside the first detection range and is smaller than the latter. The second sensor (8) is released by the first sensor (5) as soon as the latter detects a movement. The temperature recorded by the second sensor at the time of release is stored as a reference temperature. The output signals (A,B) of the sensors (5,8), which are conditioned by evaluation stages (7,10), are combined with one another via an OR gate (7) to the output signal (C) of the sensor switch (11).