The H3YN-4 AC200-230 is a timer from the Omron H3YN series. It has a range of 0.05 seconds to 100 hours, and can be used for many different functions such as controlling on/off cycles of an appliance, regulating the speed of motors, and controlling the timing of various operations. It has six versions available, with each version being adjustable from either the front or rear panel. This part is rated 200-230 volts AC, and can be used in a variety of industrial applications.