CBU-PWM4-4 is a Bluetooth controllable, Casambi enabled four channel PWM dimmer for constant voltage LED loads, such as LED strips and constant voltage LED modules. 

It is connected between a 12-24 VDC Class 2 power supply and a constant voltage LED load. CBU-PWM4-4 can control up to four channels making it an ideal partner for RGBW and tunable white (TW) applications.

The maximum combined output current is 4 A which can be freely divided between 1 -4 channels. CBU-PWM4-4 is protected against overvoltage, overcurrent and short circuit situations.

CBU-PWM4-4 can be controlled with Casambi app which can be downloaded free of charge from Apple App Store and Google Play Store. Different Casambi enabled products can be used as a simple one luminaire direct control to a complete and full-featured light control system where up to 127 units (Classic) or 250 units (Evolution) form automatically an intelligent mesh network.



Depending on the selected profile of the PWM4, any control method (App, Switch, Sensor, etc) will allow for digital control of the applicable luminaires. 

For example: 

- If the profile'CBU-PWM4 TW' is being used and the user selects the luminaire at 2700k, output 2 of the PWM4 will output 0 VDC and output 1 will output the specified intensity of the 2700k.

For profiles with custom CCT ranges, please contact Casambi support. 

- If profile 'CBU-PWM4 RGB' is used and the user selects 



The configuration or profile of the PWM4 can be changed from the application for numerous different applications. 

To change the 'profile' tap on an UNPAIRED device and press "Change Profile". Then choose the desired profile, and "Start Update". For a list of the devices profiles and what they are used for, see below:


ProfileProfile ImageUI ControlWiring

1 Channel PWM Control

Output +: Common/GND

Output 1: Dimmer 1 (0V- Input Voltage)



2 Channel PWM Control

Output +: Common/GND

Output 1: Dimmer 1 (0V- Input Voltage)

Output 2: Dimmer 2 (0V- Input Voltage)


3 Channel PWM Control

Output +: Common/GND

Output 1: Dimmer 1 (0V- Input Voltage)

Output 2: Dimmer 2 (0V- Input Voltage)

Output 3: Dimmer 3 (0V- Input Voltage)



4 Channel PWM Control

Output +: Common/GND

Output 1: Dimmer 1 (0V- Input Voltage)

Output 2: Dimmer 2 (0V- Input Voltage)

Output 3: Dimmer 3 (0V- Input Voltage)

Output 4: Dimmer 4 (0V- Input Voltage)

3 Channel RGB Control

Output +: Common/GND

Output 1: Red

Output 2: Green

Output 3: Blue


3 Channel RGB Control (625 Hz)

Output +: Common/GND

Output 1: Red

Output 2: Green

Output 3: Blue


4 Channel RGBW Control

Output +: Common/GND

Output 1: Red

Output 2: Green

Output 3: Blue

Output 4: White LED (Affects Cold White LED only)

With White at 0% Warm White (Yellow) will remain on.


4 Channel RGBW Sliders

Output +: Common/GND

Output 1: Red

Output 2: Green

Output 3: Blue

Output 4: White LED

Tunable White Profiles


Tunable white profiles are configurable by controlling the individual luminaire from the popup settings (as shown below), using basic swipe gestures as shown in THIS document or by configuring temperatures with a scene or using circadian feature of a scene.


2 Channel Tunable White Control

Output +: Common/GND

Output 1: 2700K (0V-12/24V)

Output 2: 6000K (0V-12/24V)

Dimmer and Temperature are proportional to Output Voltage of Output 1/2



2 Channel Tunable White Control

Output +: Common/GND

Output 1: 2700K (0V-12/24V)

Output 2: 6000K (0V-12/24V)

Output is Linear



2 Channel Tunable White Control

Output +: Common/GND

Output 1: 2700K (0V-12/24V)

Output 2: 6000K (0V-12/24V)



3 Channel Tunable White Control

Output +: Common/GND

Output 1: Brightness/ 0-100% dimmer

Output 2: 4750-6000K Output

Output 3: 2700-4750 Output