This 4 position, fan switch will run your 3 speed heater fan without complicated relay wiring.

It also has a live out terminal for a warning light or control system, this can also be used to switch a compressor in an Aircon Setup. 

The 25mm Dia Rubber knob, with fan symbol is 18mm deep. 

The Switch mounts through an 11mm Dia hole.  The switch housing is 26mm Square and 30mm deep including the terminals. 

Wiring Connections:

C-Live feed to switch, L-Speed 1, M-Speed 2, H-Speed 3, B-Live out in any on position (eg. on warning light)

Note: Your motor must have windings for three speed operation.

3 SPEED FAN SWITCH #SWFAN