I have a transformer based AC fan regulator with five output steps. The regulator has a manual rotary switch (5 steps) which selects different windings on the secondary coil to give different output voltage (240-120V). I would like to replace the switch with something I can interface from a microcontroller.
Can I assume the regulator already contains circuitry to handle the inductive load discharges while breaking current, so it should be safe to simply put in a relay (one relay for each output step) instead of a switch? Or is a relay more sensitive to voltage spikes than a manual switch, so I would need some extra protection?