The threshold switch is used to switch units, pumps, fans, burners, etc. As soon as the input voltage reaches the switching threshold, the relay switches on. If the input voltage falls below the switch-off threshold, the relay switches off again. The module is designed for two-stage control via an analog 0 to 10 V DC control signal. Connection with screw terminals, control signal 0 V DC = stage 1 active, control signal 5 V DC = no stage active (OFF), control signal 10 V DC = stage 2 active, with manual control level