Switch module for use in the FS20 DIN rail system. The module can be operated directly on the device itself, as well as via any transmitter of the FS20 radio switch system. A programmable timer is integrated (duty cycle 1 s to 4.5 h). Power supply & switch signal feeding via the FS20 SEH power pack. Radio reception via the FS20 EAM radio receiver in combination with the power pack.