The H3M-AC120-B is part of the H3M series Omron programmable relays. This component is a time delay relay that offers multiple timing functions and a variety of timing ranges. It has an operating voltage range of 24-240VAC, a contact capacity of 2A and a rated insulation voltage of 500V. It has two input terminals, one for a control signal and one for a manual reset, as well as a three-pole output for ON/OFF control. It also has a wide range of adjustable pulse delay parameters, such as On Delay, Pulse/Off Delay, Repeat Cycle, Accumulative, and Intermittent. It can be used for various timing or logic control applications.