Installing THPG Rotary Switches

Part 1: Electrical Insert

The main part of the switch, which gets fitted first. Wire the connectors at the back of the unit to the existing electrical installation and then screw the unit into the back box with flat-head device screws (to enable the frame to sit flush on top of the unit).

Being an authentic replica product, the connectors on THPG switches are “old-fashioned” screw fittings. The live connector is copper-coloured.

Part 2: Frame

As usual with European switches, the frame that provides the decorative cover over the insert is not permanently fixed to the unit. In THPG switches, it is held in place by a small front plate (see part 3).

Part 3: Front plate

The small round front plate is placed over the round opening in the frame and is secured with the included small hexagonal nut. Please make sure not to over-tighten the nut, which can cause deformation or cracking of the front plate.

The rotary knob/handle then slides onto the protruding central part of the insert and the included small flat-head screw goes into the centre slot of the handle. The last step of fitting the switch is simply tightening that screw, to secure the handle. Again, please don’t over-tighten anything – Bakelite, Duroplast and particularly Porcelain can crack or splinter easily.

Removing the switch

With THPG switches you simply need to reverse the fitting process if removal is required. Loosen the small flat head screw in the centre of the rotary knob until it comes out. Remove the small nut which holds the front plate in place and take off front plate and frame.