C-Bus Dimmer DIN Rail Mounted Leading Edge, 240V AC, 8 Channel, 1A, With C-Bus Power Supply

C-Bus Dimmer DIN Rail Mounted, Leading Edge, 240V AC, 8 Channel, 1A, With C-Bus Power Supply

Item Number: L5508D1A


Product Dimensions

Width icon

Width215 mm

Height icon

Height85 mm

Depth icon

Depth65 mm


Qty UoM EAN Colour





Product brand


Product or component type


Device application


Sustainable offer status

Green Premium product


Device presentation

basic element

Load type

incandescent|low voltage lamp with electronic transformer

Dimmer type

leading edge

Communication network type


Local signalling


Number of channels


Connector type

RJ45 for C-Bus|RJ45 for remote override

Mounting support

DIN rail

Clamping connection capacity

1 x 2.5 mm²|2 x 1.5 mm²


215 mm


85 mm


65 mm

Net weight

675 g

Ambient air temperature for operation

0...45 °C

Relative humidity

10...95 %

Reach regulation

Reference contains Substances of Very High Concern above the threshold

Eu rohs directive


Toxic heavy metal free


Mercury free


Rohs exemption information


China rohs regulation

 Pro-active China RoHS declaration (out of China RoHS legal scope)

Environmental disclosure


Circularity profile



Package 1 bare product quantity


Load current

1 A per channel

Power supply output current

200 mA

Standby consumption

10 W

Network frequency

47...53 Hz|57...63 Hz

Maximum number of supported devices

10 per network

Input impedance

50 kOhm at 1-1 kHz

Isolation voltage

3.75 kV from C-Bus to mains

Starting time

5 s

Time delay range

0...33.5 min

Software function

select network clock|select network burden|select time delay range

Number of modules


Unit type of package 1


Number of units in package 1


Package 1 height

9.6 cm

Package 1 width

11.0 cm

Package 1 length

22.8 cm

Package 1 weight

786.0 g


The product must be disposed on European Union markets following specific waste collection and never end up in rubbish bins
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  • Software - Release

Frequently Asked Questions

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Why is there still 240V on the C-Bus dimmer output when it has been switched off from C-Bus?

C-Bus dimmer is controlled by Triac/Mosffet and due to this has a small leakage current.

This small leakage current will impose main voltage out on the dimmer output/load even those the channel is switched off via C-Bus.

We advise that the whole dimmer needs to be switched off before maintenance takes place.


What to do when C-Bus dimmer channel will not turn off ?

- Initially check that the programming is correct.

- If using LED lights, the LED may stay on when the channel is off, this is due to the leakage current being enough to power the LED, use of a 31LCDA may resolve this issue.

- If using Halogen and  the channel will not turn off, there may be damage to the electronics on this channel - Electricians only to perform this check, disconnect the Active's , Neutral and Earth from the unit, remove the cable for the load on that channel then with a multimeter check between the Neutral and that suspect channel output, if you see a low resistance the Triac has shorted.

- Advise not to use this channel and label as faulty, other channels on this dimmer should still be ok to use as per normal, alternatively you could return this unit for a quote on repair, note a repair may not be possible.

What type of LED's can be used on C-Bus Dimmers?

Firstly you will need to confirm whether your C-Bus system contains C-Bus Leading Edge Dimmers or C-Bus Universal Dimmers, You may need to consult with your EcoXpert in Light and Room Control which one(s) you have if unsure. 

The general recommendations for LED compatibility with C-Bus Dimmers is as follows
1) Ensure your LED's have a dedicated LED Driver (electronic transformer) that supports your C-Bus Dimmer type
2) Bench test that the LED Driver is of good quality and works as expected at your site
3) C-Bus Dimmer channels require >25W of load if less is connected to a specific channel that channel will require the addition of a 31LCDA (Load Corrective Device)
4) If the dimming range of the LED fittings is specified by the manufacturer - the installer can programmer the Min/Max settings of the C-Bus Dimming channel to match the LED fittings dimming range.

C-Bus Leading Edge Dimmers will require LED's which have electronic transformers (LED Driver) which support Leading Edge AC phase control dimming (as noted in the compatible loads section of the installation manual)

C-Bus Universal Dimmers will require LED's which have electronic transformers (LED Driver) which supports Trailing Edge AC phase control dimming (as noted in the compatible loads section of the installation manual).
Although Universal Dimmers can support leading OR trailing edge AC phase control dimming it needs to be exclusively one or the other (NOT BOTH). As such LED Drivers which note LE/TE LED Driver are NOT suitable for the Universal Dimmer. 
IMPORTANT: Clipsal by Schneider Electric & Schneider Electric DO NOT make LED's which are compatible with C-Bus NOR can we recommend specific LED Drivers for your C-Bus Dimmer type as LED Dimming and Driver technology is continually changing. The above is a guideline to assist you choose a compatible LED with dedicated LED Driver that supports your dimmer in question. As noted above please have your EcoXpert in Light and Room Control bench test LED Fittings and LED Driver for suitability on your C-Bus Network.