This is the BG Nexus NBS81P 1 gang 2 way push dimmer switch ideal for mains voltage halogen lamps dimming (50-400W load), tungsten lamps dimming (60 - 400W load), low voltage 12V halogen lamps dimming (35W - 350W), dimmable LED lamps (5W - 50W), and dimmable compact fluorescent lamps (10 - 100W). It is a leading edge dimmer. part of the BG Nexus Metal Wiring Accessories; a single dimmerswitch coming in a brushed steel finish on a raised metal plate.

• Mains voltage wall mounted dimmer: 200-250V
• Type: leading edge dimmer. 
• It is suitable for LED dimming.
• Load ratings: 
  Tungsten lamps: 60-400W
  Halogen lamps (mains voltage): 50-400W
  Halogen lamps (low voltage, 12V): 35-350W
  Dimmable LED lamps: 5-50W
  Dimmable CFLs (compact fluorescent lamps): 10-100W
• Manufactured to BS EN 60669-2-1
• Minimum mounting box depth 25mm
• 10mm spacer available to provide additional wiring space (817 - Sq. 818 - Rect)
• Switch type: Push on - Push off - Rotary to adjust level
• Terminal capacity: 3 x 1mm² 2 x 1.5mm² 1 x 2.5mm²
• Fixing centres: 60.3mm
• Dimensions: 86mm x 86mm x 41.2mm

Please note: There can be issues with dimming CFL and LED lamps at a low lighting level; the Nexus dimmer products have an adjustable minimum level feature which can be used to adjust the lighting output at a low level to stabilise the load.