It sounds like you have mechanical push-button type timer.
I need more information to avoid guessing which timer is best for your situation.
I'm not sure what a 3-wire system is?
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1) How many switches control same fan
2) What color wires inside box.
Is this
3) low-horsepower bathroom fan?
4) other fan, for example: higher horsepower attic fan, 3/4 horsepower industrial kitchen fan, or 1-horsepower whole house fan?
5) Is this your home or is fan for continual commercial use?
6) Is this a countdown timer that turns fan OFF automatically after 60 minutes?
7) Or what kind of timer are you looking for.
Open following link for list of home-use countdown timers and horsepower ratings of countdown timers.
http://waterheatertimer.org/Countdown-timer-horsepower-ratings.htmlSpring-wound timers do not require extra Neutral wire, and can control 1 HP whole-house fan.
The push-button timers each require Neutral wire to run electronics inside timer, and they range from 1/6 HP to 3/4 HP which will work for any bathroom fan.
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