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1 Gang 2-Way 10-200W Intelligent Dimmer - Anthracite Screwless

£1899
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Description

The Knightsbridge SF2191AT is a 1-gang 2-way intelligent dimmer rated for 10-200W incandescent or halogen loads and 5-150W dimmable LED loads, housed behind an anthracite screwless faceplate with a matching dimmer knob. The dimmer automatically detects lamp type and switches between trailing-edge mode (default, optimised for LEDs) and leading-edge mode (for traditional incandescent and halogen lamps) using a front-mounted control sequence.

Designed for living rooms, bedrooms, kitchens and studies where variable lighting levels are needed, the dimmer installs in a standard 25mm minimum back box and operates on 2-way switching circuits. The push-on rotary knob turns the light on or off with a press, and dims or brightens by rotating clockwise or anticlockwise. The screwless cover plate clips onto a separate steel sub-frame, leaving no visible fixings on the wall once fitted.

The anthracite finish is a mid-tone metallic grey darker than brushed chrome but lighter than matt black, pairing well with contemporary and industrial interiors. The faceplate is pressed from premium-grade steel with a low-profile projection of 4.3mm from the wall surface. Built-in overload and overheat protection cut power if the dimmer exceeds safe operating temperature or the connected load exceeds the rated wattage, preventing damage to the circuit or the dimmer itself.

For reliable performance, the dimmer should control a single lamp type and wattage — avoid mixing LED brands, mixing LED with incandescent, or connecting widely different wattages on the same circuit. This prevents flicker and ensures the automatic mode detection can stabilise correctly.

Specification
Height 87.5 mm
Width 87.5 mm
Projection 4.3 mm
Recessed Depth 21.3 mm
Min. Mounting Box Depth 25mm
Construction Premium grade steel
Finish Anthracite
Class I
IP Rating IP20
Primary Voltage 230V 50Hz
Earth Terminal Yes
Terminal Screw
Warranty 2
Downloads

Product Specification Sheet

Frequently Asked

What's the difference between trailing-edge and leading-edge mode?

Trailing-edge mode (the default) works with dimmable LED and low-voltage halogen lamps, providing smoother dimming with less flicker. Leading-edge mode suits traditional incandescent and mains-voltage halogen lamps. The dimmer auto-detects lamp type, but you can manually switch modes using the front control knob if needed.

What back box depth is required?

A 25mm minimum back box depth is needed. The dimmer has a recessed depth of 21.3mm, and the screwless cover plate adds 4.3mm projection from the wall once fitted.

Can I mix LED and incandescent bulbs on the same circuit?

No. Mixing lamp types or brands on the same dimmer circuit can cause flicker, buzzing or unreliable dimming. Use the same lamp type, brand and wattage across all bulbs controlled by this dimmer for best performance.

How do I reset the dimmer or change modes?

Press and hold the rotary knob for several seconds until the light flashes. This resets the dimmer and allows it to re-detect the lamp type. The product specification sheet (linked above) contains the full mode-switching sequence.

Shipping & Returns

Free worldwide delivery

Free worldwide delivery on all orders over £99. International orders for third-party brand products may be subject to an additional courier surcharge based on volumetric weight, particularly on larger lighting fixtures — if a surcharge applies, our team will email you with the amount before dispatch and you can proceed or cancel for a full refund. See full delivery terms.

Returns

30-day returns window from delivery. As all our products are electrical or lighting goods, returned items must be inspected and recertified by a qualified electrician before resale — the cost of this inspection (25–40% of the item value) is deducted from your refund. Customers pay return shipping. Made-to-order, special-order and clearance items cannot be returned. See full returns policy.

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    Description

    The Knightsbridge SF2191AT is a 1-gang 2-way intelligent dimmer rated for 10-200W incandescent or halogen loads and 5-150W dimmable LED loads, housed behind an anthracite screwless faceplate with a matching dimmer knob. The dimmer automatically detects lamp type and switches between trailing-edge mode (default, optimised for LEDs) and leading-edge mode (for traditional incandescent and halogen lamps) using a front-mounted control sequence.

    Designed for living rooms, bedrooms, kitchens and studies where variable lighting levels are needed, the dimmer installs in a standard 25mm minimum back box and operates on 2-way switching circuits. The push-on rotary knob turns the light on or off with a press, and dims or brightens by rotating clockwise or anticlockwise. The screwless cover plate clips onto a separate steel sub-frame, leaving no visible fixings on the wall once fitted.

    The anthracite finish is a mid-tone metallic grey darker than brushed chrome but lighter than matt black, pairing well with contemporary and industrial interiors. The faceplate is pressed from premium-grade steel with a low-profile projection of 4.3mm from the wall surface. Built-in overload and overheat protection cut power if the dimmer exceeds safe operating temperature or the connected load exceeds the rated wattage, preventing damage to the circuit or the dimmer itself.

    For reliable performance, the dimmer should control a single lamp type and wattage — avoid mixing LED brands, mixing LED with incandescent, or connecting widely different wattages on the same circuit. This prevents flicker and ensures the automatic mode detection can stabilise correctly.

    Specification
    Height 87.5 mm
    Width 87.5 mm
    Projection 4.3 mm
    Recessed Depth 21.3 mm
    Min. Mounting Box Depth 25mm
    Construction Premium grade steel
    Finish Anthracite
    Class I
    IP Rating IP20
    Primary Voltage 230V 50Hz
    Earth Terminal Yes
    Terminal Screw
    Warranty 2
    Downloads

    Product Specification Sheet

    Frequently Asked

    What's the difference between trailing-edge and leading-edge mode?

    Trailing-edge mode (the default) works with dimmable LED and low-voltage halogen lamps, providing smoother dimming with less flicker. Leading-edge mode suits traditional incandescent and mains-voltage halogen lamps. The dimmer auto-detects lamp type, but you can manually switch modes using the front control knob if needed.

    What back box depth is required?

    A 25mm minimum back box depth is needed. The dimmer has a recessed depth of 21.3mm, and the screwless cover plate adds 4.3mm projection from the wall once fitted.

    Can I mix LED and incandescent bulbs on the same circuit?

    No. Mixing lamp types or brands on the same dimmer circuit can cause flicker, buzzing or unreliable dimming. Use the same lamp type, brand and wattage across all bulbs controlled by this dimmer for best performance.

    How do I reset the dimmer or change modes?

    Press and hold the rotary knob for several seconds until the light flashes. This resets the dimmer and allows it to re-detect the lamp type. The product specification sheet (linked above) contains the full mode-switching sequence.

    Shipping & Returns

    Free worldwide delivery

    Free worldwide delivery on all orders over £99. International orders for third-party brand products may be subject to an additional courier surcharge based on volumetric weight, particularly on larger lighting fixtures — if a surcharge applies, our team will email you with the amount before dispatch and you can proceed or cancel for a full refund. See full delivery terms.

    Returns

    30-day returns window from delivery. As all our products are electrical or lighting goods, returned items must be inspected and recertified by a qualified electrician before resale — the cost of this inspection (25–40% of the item value) is deducted from your refund. Customers pay return shipping. Made-to-order, special-order and clearance items cannot be returned. See full returns policy.