The switch should be rated 250VAC and at least 10 amps. I would expect these specs to be printed on the old part.
The switch should be bypassed with a .01uf 1000V capacitor to prevent arcing. Its not a bad idea to install a current inrush limiter if one is not already present.
The switch should be bypassed with a .01uf 1000V capacitor to prevent arcing. Its not a bad idea to install a current inrush limiter if one is not already present.