My bathroom extract fan's wax actuator has failed. This is used to
slowly open the shutters, when the fan is triggered. This one..

https://www.ebay.co.uk/itm/223481092415?ul_noapp=true

It looks as if it has over-heated in the area, before it actually
failed. As it is marked 120/240v I'm thinking to install a dropper to
reduce the voltage across it to around 120v, but I cannot find a
specification for the wattage or current to determine a suitable
dropper.

Anyone know please?