LightwaveRF LW831WH Lighting Inline Dimmer Relay 250W

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Quoting product code: N78QJ


About this product


  • Used for switching and dimming bulbs up to a maximum of 250W
  • The rotary switch changes the range of dimming
  • Works with all LightwaveRF controllers

Product overview

• Used for switching and dimming LED or halogen bulbs up to a maximum of 250W
• The rotary switch changes the range of dimming and maximises capability with dimmable LED bulbs
• Eight step rotary switch to adjust the lower end of the dimming range of the bulbs which reduces the risk of flickering at lower dimming levels
• Link up with up to six separate transmitters to control lights at the same time
• Works with all LightwaveRF controllers

What does this dimmer relay do?
The dimmer relay is designed to switch and dim your lighting circuits rated up to 250W. It is mains powered and includes a rotary switch which will increase or decrease the range of dimming. This maximises the compatibility with LED bulbs that are very sensitive when it comes to voltage drop over a dimming circuit.

How do I control the relay?
Using the LightwaveRF home automation range, you can easily control the inline dimmer automatically, using the standard light switches, or remotely using any of the LightwaveRF controllers. You can even control it from the free downloadable app when used with a LightwaveRF Wi-Fi Link – N55LL or A23RX- which is sold separately.

How easy is the relay to install?
If you have a working knowledge of household electrics you should be able to install the relay yourself. You will need to unscrew the bottom of the relay which will open to give you the terminals. You will then need to wire your live, neutral and earth to the relevant terminals. If you are in any doubt, we recommend you consult a trained electrician, who will be able to wire this in.

For the LightwaveRF Wi-Fi Link, click here: A23RX


Product Specifications

Pack Size:




Dimmer Switch





Package Contents:

1 x LightWaveRF LW831WH Lighting Inline Dimmer Relay 250W

Power Specifications

Power Supply:


Dimensions & Weight







If the power is cut to the dimmer then dwitched back on, will the remote still work without having to re sync with the dimmer? I want to put the dimmer on a ceiling light which will be switched on/ off from a light switch on the wall

Asked by: Jamiecunningham
Yes the remote should still work after the light has been switched on/ off
Answered by: Billy
Date published: 2017-01-22

My LED fittings are already dimmable, as are the bulbs. Do I still need this or can I just use the normal dimmer switch without the in-line dimmer?

Asked by: Adam
As Technical Support Advisors we cannot offer full advice on mains electrical installations, this job would be best left down to the professionals, if you are at all unsure we would strongly recommend consulting a qualified electrician for help and support or to complete the job for you.
Answered by: Dominic
Date published: 2016-02-21

Hello if I use the LightwaveRF Lighting Inline Dimmer Relay 250W with a conventional dimmer switch will there be any issues with turning the ne up while the other is down?

Asked by: Richard
This information is best detailed in the user manual / datasheet which is available from the download tab on the products webpage. or by contacting the manufacturer directly
Answered by: Les
Date published: 2018-02-01

please can you tell me the dimensions of this unit. Thanks.

Asked by: craig
Dimensions 135x65x37
Answered by: Dominic
Date published: 2015-07-17

Need to control several groups of lights (using three-way relay modules) but at a lower level than full brightness (let's use a dimmer module first). Can I chain these modules - dimmer set to say 50% brightness, relays control one of several groups.

Asked by: Terry
I have provided a link to the full manual for the item.
Answered by: Dominic
Date published: 2018-02-01

What is the minimum load rating? Will it be able to control a single 5W, 240V dimmable LED bulb?

Asked by: syong
These dimmers have 8 selectable dim ranges which are designed to increase compatibility with most types of LED lamps and reduce flickering at certain points in the dimming curve which can be common with some types of lamp. Their minimum/maximum loads are as follows: 20 watt – 250 watt incandescent (halogen) 3 watt – 60 watt LED 20 watt – 250 watt electronic transformer 40 watt – 250 watt inductive transformer
Answered by: Dominic
Date published: 2016-10-22
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