Question is not clear.
Add a comment and say specifically what timer you have and what type of switch(es) you want to control, and add what voltage you are working with and what color wires you have.
You posted under Leviton 6230 30-minute countdown timer.
Generally, a countdown timer is not considered a programmable timer since the countdown program is already inside the timer.
With countdown timer, you push a button that turns circuit ON, and after countdown expires, the circuit turns OFF.
http://waterheatertimer.org/Countdown-timer-horsepower-ratings.html#6230Countdown timer can easily switch a contactor ON, and then turn it off after countdown expires.
http://waterheatertimer.org/H230A.htmlUpvote the help.
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