Actuator for 4 Drives with 3 Limit Switches


  • KNX actuator for four motors (drives with 2 lower limit switches)
  • Integrated automatic functions for shading/sun protection for each drive
  • 12 binary inputs for buttons, auxiliary contacts etc.


The KNX S4-B12 DES actuator is an electronic control device for controlling up to 4 motors with 3 limit switches. A 230 V AC power supply is needed for the actuator and motors.

  • 4 motor outputs each for one motor with 3 limit switches (shutters with working position)
  • Switch panel with 4 switch pairs and status LEDs
  • 12 binary input for use as manual or bus button
  • Position feedback of the movement position
  • Position storage (movement position) via 1-bit object (storage and call-up, e.g. by button)
  • Controls through internal or external automatic operation
  • Integrated shading control for each motor output
  • Scene control for movement position with 16 scenes per motor
  • Blocking objects and alarm messages have different priorities so that safety functions always have priority (e.g. wind blocking)
  • Manual or automatic control configuration per time or communication object

Configuration is made using the KNX software ETS 5

AssemblySeries installation on mounting rail
Protection categoryIP 20
Dimensionsapprox. 107 × 88 × 60 (W × H × D, mm),
6 module units
Weightapprox. 340 g
Ambient temperatureOperation -20…+70 °C, storage -55…+90°C
Ambient humiditymax. 95% RH, avoid condensation
Operating voltage230V AC, 50 Hz
Power consumptionOperation max. approx. 3.5 W
Standby max. approx. 0.6 W
Poweron bus: 10 mA
Outputs4 x motors with 2 lower end switches
total max. 10 A and max. 4 A per output
Inputs12 × binary input, for 12 V DC
Max. cable length Binary inputs50 m
Data outputKNX +/- bus plug terminal
BCU typeOwn microcontroller
PEI type0
Group addressesmax. 1024
Allocationsmax. 1024
Communication objects757