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13A 2 Gang SP Switched Socket Dual USB-A - White Square Edge

£999
The RRP is the manufacturer's recommended retail price of the item.
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Description

The Knightsbridge SN9904 is a 13A 2-gang SP switched socket with two USB-A charging ports, delivering a shared 5V DC 3.1A output behind a white square-edge thermoset resin faceplate. Single-pole switching isolates the live line when the socket is switched off, whilst the USB ports remain powered for continuous device charging.

Designed for residential and light commercial installation, the socket fits a 25mm minimum back box depth (35mm recommended where cable runs are tight) and uses screw-cap covers that hide fixing screws once the plate is tightened to the wall. Top-access captive terminals speed up wiring and twin earthing points provide reliable grounding across both outlets. The 13A rating handles standard UK appliance loads up to 3,120W per outlet.

The white thermoset resin construction resists heat discolouration better than thermoplastic alternatives and incorporates anti-microbial properties to reduce surface bacteria build-up in high-touch areas like kitchens and bathrooms. The square-edge profile sits flush to the wall with a 9mm plate thickness, giving a clean finish without rounded corners or bevels. The 3.1A shared USB output charges most phones and tablets at standard speeds, though fast-charge protocols are not supported.

Specification
Height 86mm
Width 146mm
Depth 32.9mm
Projection 13.7°
Recessed Depth 19.2mm
Min. Mounting Box Depth 25mm
Construction Thermoset resin
Finish White
IP Rating IP20
Primary Voltage 230V 50Hz
Downloads

Product Specification Sheet

Frequently Asked

What back box depth is required?

A 25mm minimum back box depth is needed for safe installation. Where cable runs are tight or multiple cables enter the back box, a 35mm depth is recommended to allow sufficient space for wiring without compressing conductors against the back of the socket.

What's the USB charging output?

The dual USB-A ports provide a shared 5V DC 3.1A output. When both ports are in use simultaneously, the 3.1A is divided between connected devices. Most phones and tablets charge at standard speeds, though fast-charge protocols are not supported.

Do the USB ports stay powered when the socket is switched off?

Yes. The SP (single-pole) switching isolates only the 13A outlets. The USB ports remain powered continuously to allow overnight charging without needing the socket switches left on.

What's the difference between square-edge and rounded-edge plates?

Square-edge plates like this one sit flush to the wall with a 9mm thickness and no bevelled corners, giving a clean, modern finish. Rounded-edge plates have a slightly softer profile and may suit traditional interiors better. Both fit the same back boxes and wiring.

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 SN9904 is a 13A 2-gang SP switched socket with two USB-A charging ports, delivering a shared 5V DC 3.1A output behind a white square-edge thermoset resin faceplate. Single-pole switching isolates the live line when the socket is switched off, whilst the USB ports remain powered for continuous device charging.

    Designed for residential and light commercial installation, the socket fits a 25mm minimum back box depth (35mm recommended where cable runs are tight) and uses screw-cap covers that hide fixing screws once the plate is tightened to the wall. Top-access captive terminals speed up wiring and twin earthing points provide reliable grounding across both outlets. The 13A rating handles standard UK appliance loads up to 3,120W per outlet.

    The white thermoset resin construction resists heat discolouration better than thermoplastic alternatives and incorporates anti-microbial properties to reduce surface bacteria build-up in high-touch areas like kitchens and bathrooms. The square-edge profile sits flush to the wall with a 9mm plate thickness, giving a clean finish without rounded corners or bevels. The 3.1A shared USB output charges most phones and tablets at standard speeds, though fast-charge protocols are not supported.

    Specification
    Height 86mm
    Width 146mm
    Depth 32.9mm
    Projection 13.7°
    Recessed Depth 19.2mm
    Min. Mounting Box Depth 25mm
    Construction Thermoset resin
    Finish White
    IP Rating IP20
    Primary Voltage 230V 50Hz
    Downloads

    Product Specification Sheet

    Frequently Asked

    What back box depth is required?

    A 25mm minimum back box depth is needed for safe installation. Where cable runs are tight or multiple cables enter the back box, a 35mm depth is recommended to allow sufficient space for wiring without compressing conductors against the back of the socket.

    What's the USB charging output?

    The dual USB-A ports provide a shared 5V DC 3.1A output. When both ports are in use simultaneously, the 3.1A is divided between connected devices. Most phones and tablets charge at standard speeds, though fast-charge protocols are not supported.

    Do the USB ports stay powered when the socket is switched off?

    Yes. The SP (single-pole) switching isolates only the 13A outlets. The USB ports remain powered continuously to allow overnight charging without needing the socket switches left on.

    What's the difference between square-edge and rounded-edge plates?

    Square-edge plates like this one sit flush to the wall with a 9mm thickness and no bevelled corners, giving a clean, modern finish. Rounded-edge plates have a slightly softer profile and may suit traditional interiors better. Both fit the same back boxes and wiring.

    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.