Esu Electronic 51801 SwitchPilot Extension. Extension module for SwitchPilot If required, the SwitchPilot can be expanded with the SwitchPilot extension module: connected to the side of the SwitchPilot, it offers four relay outputs, which are used to switch potential-free loads or to polarize turnouts; the ideal supplement for complicated circuits. Operating mode The SwitchPilot extension module only works in combination with a SwitchPilot. Connected to the side, it receives its power supply directly from the SwitchPilot. It contains a total of 4 twin relays (2 x DPDT), each of which is dedicated to a pair of transistorized SwitchPilot outputs. The switch position of the respective relay depends directly on the state of this output pair. With the help of the relay, it is possible to switch loads, galvanically separate them from the rest of the track (works like a k84), or polarize a motorized turnout. With the continuous rating of 1.5 Amp of the relay, it is possible to polarize switches, or block powered signals based on the signal, or motorized devices, such as (water) pumps can be switched. Particularly complicated is the option to control motorized switches: of course the SwitchPilot extension module also easily handles the necessary motor polarization.