20AX 2 Way SP Switch Module Centre Off - Anthracite Grid

The Knightsbridge GDM004AT is a 20AX 2-way single pole switch module with a centre-off position, finished in anthracite and designed to clip into Knightsbridge Grid mounting frames (sold separately). The centre-off position allows the switch to control two independent circuits from a single module, with an off state in the middle position that isolates both circuits simultaneously.

Designed for residential, commercial and light industrial installations where multiple lighting or low-voltage circuits need independent control from a single wall plate, the module suits applications like corridor lighting with directional switching, two-way stairwell control with an off position between floors, or dual-zone lighting in open-plan kitchens and living areas. The 20AX rating handles resistive loads up to 4,600W at 230V, exceeding the 10AX capacity of standard lighting switches and making it suitable for banks of LED downlights or fluorescent tube arrays.

The module measures 24.8mm wide (one grid module width), allowing multiple modules to be combined side-by-side within a single frame to create custom switch configurations. The anthracite finish is a dark grey tone that sits between matt black and mid-grey, pairing with contemporary interiors and metal finishes without the starkness of pure black. The ABS and steel construction provides durability under repeated switching cycles, and the IP20 rating confirms suitability for dry indoor locations. The module requires a minimum 35mm back box depth and clips into the frame from the front, meaning the cover plate does not need removing to swap or reconfigure modules.

Product Specification Sheet

What does the centre-off position do?

The centre-off position isolates both circuits controlled by the module. In the up position, circuit A is live. In the down position, circuit B is live. In the centre position, both circuits are off. This allows one switch to control two independent lighting or low-voltage circuits without needing two separate modules.

What mounting frame is needed?

The module clips into Knightsbridge Grid mounting frames, which are sold separately. A one-module frame accommodates this single switch, while wider frames (2-module, 3-module, 4-module) allow multiple modules to be combined side-by-side within a single faceplate. The frame fixes to a standard 35mm minimum depth back box.

What load can it handle?

The 20AX rating handles resistive loads up to 4,600W at 230V, significantly higher than standard 10AX lighting switches. This makes it suitable for controlling multiple LED downlight circuits, fluorescent tube banks, or low-voltage transformer arrays without exceeding the module's capacity.

Can modules be swapped without removing the cover plate?

Yes. The module clips into the mounting frame from the front, so individual modules can be removed or replaced without removing the entire cover plate assembly. This makes reconfiguring switch layouts or replacing faulty modules simpler than traditional screw-fixed switches.