Yeah, that could have been bad.
That timer is rated for up to 14 amp. If your surge and breaker are over that it will burn out like a fuse.
Make sure your receptacls/timers are higher or equivalent to surge. And surge is no higher then breaker panel so it doesn't kick that.
You can upgrade your wall receptacles to 20 amp just to be safe also, most receptacles are only 15 amp receptacles on 15 amp breakers although the breakers could be 20 and 15 amp receptacles. You can also upgrade the breakers to 20 amp allowing you to draw up to 20 amps. I wouldn't go higher then that without upgrading the wiring but all you would need to do it is a screwdriver and a set of pliers.
NO NO NO! you can not use a 20 amp breaker in place of a 15. The wires are not rated for that and can catch fire, negate the insurance or worse!