KNX S1-BA4

KNX Actuator, 1 Multifunctional OUT, 4 A/D Inputs

Replacement for N° 70204 KNX S1R-B4 PF

The Actuator KNX S1-BA4 with integrated façade control has a multifunctional output which can connect to either a drive with Up/Down control (blinds, awnings, shutters, windows) or two switchable devices (On/Off for light and ventilation). Because the output is designed to be free of potential, other systems can also be controlled, e.g. via the manual switch input on a motor control unit.

Automation can be specified externally or internally. Internally, there are numerous options available for blocking, locking (e.g. master-slave) and priority definitions (e.g. manual-automatic). Scenes can be saved and called up via the bus (scene control with 16 scenes per drive).

The KNX S1-BA4 has four analogue/digital inputs that are used as bus inputs (buttons, alarm messages etc.) or for temperature sensors T-NTC.


  • KNX S1-BA4 KNX S1-BA4
  • Potential-free multifunctional output each for a 230 V drive (shade, window) or for connecting two switchable 230 V devices (light, fan) or for a DC drive (shade, window)
  • In the AC voltage mode, automatic runtime measurement of the drives for positioning (including fault notification object)
  • Switching of the relay in the AC mode with low wear near the zero-voltage
  • Keypad with button pair and status LEDs
  • 4 inputs for binary contacts or temperature sensor
  • Position feedback (movement position, also slat position for shutters)
  • Position storage (movement position) via 1-bit object (storage and call-up e.g. via buttons)
  • Parameters for taking drive and mechanics downtimes into account
  • Control via internal or external automation functions
  • Integrated shade control with slat adjustment for shutters based on the position of the sun
  • Scene control for movement position with 16 scenes per drive (also slat position for shutters)
  • Mutual locking of two drives using zero position sensors prevents collisions e.g. of shade and window (master–slave)
  • Blocking objects and alarm reports have different priorities, so safety functions always take precedence (e.g. wind block)
  • Manual or automatic priority setting via time or communication object
  • 4 temperature switching outputs in the application program with adjustable threshold values (presetting the parameters or communication object)
  • Brief time limit (movement command blocked) and 2 movement limits
  • Configuration is made using the KNX software ETS
Housing Plastic
Colour White
Assembly Series installation on mounting rails
Protection category IP 20
Dimensions approx. 53 x 88 x 60 (W × H × D, mm), 3 width units
Weight approx. 170 g
Ambient temperature Operation -20…+70°C, storage -55...+90°C
Ambient humidity max. 95% RH, non-condensing
Operating voltage KNX bus voltage
Current at the bus 10 mA
Auxiliary voltage for output DC voltage up to 24V DC or
AC voltage up to 250V AC
Output 1 × output, free of potential with 2 connections for drive up/down or 2 devices.
Can withstand a total of max. 4 A (resistive load)
Minimum current for runtime measurement AC effective 200 mA
Inputs 4× analogue/digital, max. output length 10 m
Setting range for the T-NTC temperature sensor on the input -30°C...+80°C
Data output KNX +/- bus connector terminal
BCU type Integrated microcontroller
PEI type 0
Group addresses max. 1024
Assignments max. 1024
Communication objects 200