ATC Percentage Timers are available in several models including the Model CP single circuit repeat cycle timer is a continuous cycling control where the ON or circuit closure time is dial adjusted for a percentage of the total time cycle. The ATC 304 incorporates heavy-duty contacts that are capable of switching loads as large as 4.6 KW directly. And the 304GX operates like the 304G, only with cycle progress memory and a latching relay. The 304GX saves progress when power is removed, and will resume timing when power is reapplied. The relay only changes state when the cycle reaches the set point or the end of the cycle. They are widely regarded as the most rugged and dependable of percentage timers available on the market today.