"Current conduction switch", connects or disconnects automatically another device when starting a direct-current device. For example, the radio is disconnected automatically when switching on the CB-radio equipment in the car. Or the amplifier of the radio equipment is connected automatically when the CB-radio transmits. Or the outdoor illumination of a motor caravan is disconnected automatically when switching on the indoor lighting. May also be used for controlling whether lamps at a vehicle light (control of current conduction).
The module simply has to be connected in series with the power lead of the device (6 - 30 V/DC) and connects and disconnects other devices via a potential-free contact (1 x change over, max. 3 A). The module reacts on currents between ca. 1 - 5 A.