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Knightsbridge 40-400W Leading Edge Dimmer Module - 3-100W LED Compatible

£899
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Description

The Knightsbridge SN400M is a replacement leading edge dimmer module rated for 40-400W incandescent loads or 3-100W LED loads, housed in a compact 52mm x 26mm x 44mm black polycarbonate enclosure. The module uses leading edge phase-cut dimming technology and provides push on/off control through the front plate, with the dimming level set by rotating the control knob on the faceplate it sits behind.

Designed as a retrofit or replacement module for existing Knightsbridge dimmer installations, the SN400M fits behind standard UK dimmer faceplates and requires a minimum 35mm back box depth for safe installation. The offset terminal position allows wiring in tight back boxes where central terminals would clash with adjacent devices. The module supports two-way switching, meaning it can be controlled from two separate switch positions when wired with an intermediate switch.

The leading edge dimming method works reliably with traditional incandescent and halogen bulbs across the full 40-400W range, but LED compatibility depends on the specific LED driver design. Most dimmable LED bulbs rated between 3-100W will function with this module, but some manufacturers' LEDs may flicker, hum, or fail to dim smoothly depending on their internal driver circuitry. Knightsbridge recommends testing compatibility with your specific LED bulb before final installation. The module carries BS EN 60669-2 certification and an IP20 rating for dry indoor installation only.

Specification
Height 52 mm
Width 26 mm
Depth 44 mm
Projection 18 mm
Recessed Depth 27 mm
Min. Mounting Box Depth 35mm
Construction PA
Finish Black
IP Rating IP20
Primary Voltage 230V 50Hz
Warranty 3
Downloads

Product Specification Sheet

Frequently Asked

Will this work with my LED bulbs?

The module is rated for 3-100W dimmable LED loads, but compatibility depends on the LED bulb's internal driver. Some LEDs will dim smoothly, while others may flicker or hum. Knightsbridge recommends checking with your LED bulb manufacturer before installation, or testing the module with your specific bulbs before committing to a full installation.

What does leading edge dimming mean?

Leading edge dimming cuts the front edge of the AC waveform to reduce power to the bulb. It works reliably with incandescent and halogen loads, and with many older-style dimmable LED drivers. Modern LEDs often prefer trailing edge dimming, so check your bulb specifications.

Can this be used in a two-way switching setup?

Yes. The module supports two-way switching, allowing control from two separate switch positions when wired with an intermediate switch. The dimming function is controlled from the primary dimmer location only.

What back box depth is required?

A minimum 35mm back box depth is needed for safe installation. The module itself is 44mm deep, with 27mm recessing into the back box and 18mm projecting from the wall once the faceplate is fitted.

Shipping & Returns

Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

To arrange a return, call us on 020 8149 5199 or use our contact page.

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Installation

Fits standard UK back boxes

Designed to fit standard UK back boxes for a straightforward swap of your existing fittings.

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Free delivery on orders over £99, in the UK and worldwide. Easy returns within 14 days, subject to our returns policy. Full manufacturer warranty included.

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    Description

    The Knightsbridge SN400M is a replacement leading edge dimmer module rated for 40-400W incandescent loads or 3-100W LED loads, housed in a compact 52mm x 26mm x 44mm black polycarbonate enclosure. The module uses leading edge phase-cut dimming technology and provides push on/off control through the front plate, with the dimming level set by rotating the control knob on the faceplate it sits behind.

    Designed as a retrofit or replacement module for existing Knightsbridge dimmer installations, the SN400M fits behind standard UK dimmer faceplates and requires a minimum 35mm back box depth for safe installation. The offset terminal position allows wiring in tight back boxes where central terminals would clash with adjacent devices. The module supports two-way switching, meaning it can be controlled from two separate switch positions when wired with an intermediate switch.

    The leading edge dimming method works reliably with traditional incandescent and halogen bulbs across the full 40-400W range, but LED compatibility depends on the specific LED driver design. Most dimmable LED bulbs rated between 3-100W will function with this module, but some manufacturers' LEDs may flicker, hum, or fail to dim smoothly depending on their internal driver circuitry. Knightsbridge recommends testing compatibility with your specific LED bulb before final installation. The module carries BS EN 60669-2 certification and an IP20 rating for dry indoor installation only.

    Specification
    Height 52 mm
    Width 26 mm
    Depth 44 mm
    Projection 18 mm
    Recessed Depth 27 mm
    Min. Mounting Box Depth 35mm
    Construction PA
    Finish Black
    IP Rating IP20
    Primary Voltage 230V 50Hz
    Warranty 3
    Downloads

    Product Specification Sheet

    Frequently Asked

    Will this work with my LED bulbs?

    The module is rated for 3-100W dimmable LED loads, but compatibility depends on the LED bulb's internal driver. Some LEDs will dim smoothly, while others may flicker or hum. Knightsbridge recommends checking with your LED bulb manufacturer before installation, or testing the module with your specific bulbs before committing to a full installation.

    What does leading edge dimming mean?

    Leading edge dimming cuts the front edge of the AC waveform to reduce power to the bulb. It works reliably with incandescent and halogen loads, and with many older-style dimmable LED drivers. Modern LEDs often prefer trailing edge dimming, so check your bulb specifications.

    Can this be used in a two-way switching setup?

    Yes. The module supports two-way switching, allowing control from two separate switch positions when wired with an intermediate switch. The dimming function is controlled from the primary dimmer location only.

    What back box depth is required?

    A minimum 35mm back box depth is needed for safe installation. The module itself is 44mm deep, with 27mm recessing into the back box and 18mm projecting from the wall once the faceplate is fitted.

    Shipping & Returns

    Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

    Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

    To arrange a return, call us on 020 8149 5199 or use our contact page.