The GeneralAire 4750 is the correct replacement switch for the following air cleaner models:
The GeneralAire R1-0205 Air Cleaner Switch is a replacement switch for the GeneralAire GA50A14, GA50A20, and GA50A22 Electronic Air Cleaners. The GeneralAire R1-0205 on/off switch is installed on your humidifier's power box near the safety interlock switch. With the GeneralAire 4750 on/off switch you will be able to easily switch your air cleaner on and off with simple convenience.
GeneralAire R1-0205 Air Cleaner Switch specifications: