MC41LV master clocks provide accurate time keeping for controlling of secondary clocks, bells and other electrical loads. The four, independently programmable relay circuits can be used for timed event programming, or for controlling secondary clocks. When controlling secondary clocks, 2 of the 4 relays are reserved for controlling the secondary clocks leaving 2 relays for ringing bells or controlling loads. Program memory can be adjusted to meet any specific application with up to 100 events per day, and up to 9 alternate 7 day plans or schedules for a total of 200 steps. Each program step can address any combination of the relay outputs, for any day of the week, including groups of days such as monday, wednesday and friday, or monday through friday.