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Universal two-channel dimming actuator

The KNX-DIM21 module is a universal two-channel dimming KNX actuator that allows stepless control of light sources up to 300 W per channel. The light can be turned on / off, dimmed down (darker) / dimmed up (brighter), set by using a predefined scene or another function via the KNX bus. The actuator can be used with resistive, inductive and capacitive loads (R, L, C).

The module is designed for use with 230 V AC voltage.


  • communication with KNX bus via integrated bus connector
  • automatic recognition of the connected load type
  • adjustable lighting characteristic to suit the load type
  • two-stage, firmware-hardware overheating protection system
  • overload protection
  • feedback on status of module and individual channels
  • definable reaction of each channel in case of KNX voltage loss and recovery
  • definable reaction of each channel in case of voltage recovery
  • time functions (switching delay, staircase function with warning option and operating time change)
  • value forcing function
  • option to call scenes for each channel by using 1- and 8-bit commands
  • manual operation of each channel status by using buttons on the enclosure
  • LEDs to indicate each channel status and signal troubles
  • module configuration using ETS software
  • suitable for mounting on DIN rail (35 mm)


The actual appearance of the products may differ from the presented images. Product descriptions are provided in the web service for information purposes only.


quick installer guide
updated: 2020-04-23
437 KB
general information manual
updated: 2020-04-23
1.13 MB


German, English, Italian, Dutch, Polish, Russian, Slovak
compiled: 2020-04-03


Other certificates
updated: 2019-10-29
757 KB

Technical Data

Enclosure dimensions
70 x 92 x 60 mm
Operating temperature range
160 g
IP code
Maximum tightening torque
0.5 N·m
Temperature range for storage / transport
Number of units on DIN rail
Certificate of conformity
nr 324/15885/19
Maximum cross-section of wire
2.5 mm²
Current draw from KNX bus
< 10 mA
Maximum time of response to telegram
< 20 ms
Maximum number of communication objects
Maximum number of group addresses
Maximum number of associations
Supply voltage (KNX bus)
20…30 V DC
Rated voltage Uₙ
230 V AC
Network frequency
50/60 Hz
Maximum power loss
4 W
Power consumption in standby mode
0,8 W
Contact type
Maximum output load (incandescent lamps)
300 W
Maximum output load (HV halogen lamps)
300 VA
Maximum output load (induction transformers)
300 W
Maximum output load [Tronic transformers (electronic)]
300 W
Maximum output load (HVLED lamps)
typowo 3…60 W
Maximum output load (compact fluorescent lamps)
typowo 3…60 W
Permissible mixed (resistive-inductive) output load
20…300 VA
Permissible mixed (resistive-capacitive) output load
20…300 W
Maximum device load
600 W / VA

Information materials


2leaflet - end user

3leaflet - installer

4technical data

5product data sheet

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