This is the ML Accessories - Knightsbridge SF1200MBB screwless 10AX intermediate switch, a single intermediate switch on a matt black low profile plate with a black rocker.
You need an intermediate switch when you have three switches controlling one light, for example on the landing - there's a switch at the bottom of the stairs, a switch at the top of the stairs, and one at the end of the landing.
In such a circuit what you need is a middle switch to be intermediate (for example the one at the top of the stairs) in order for all the switches to work properly.
|Switches & Sockets Specific|
|Back Box Depth||35mm|
|Plate Dimensions||87.5mm x 87.5mm|
|Plate Projection / Protrusion||4.3mm|
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