RK Electronics MGS-120A-3S Motion Guard Relay – Loss of Motion Sensor, 120V AC, 3-Second Delay

The MGS-120A-3S monitors a dry contact closure or a pulse from a proximity switch or sensor. As long as the pulses are received within the 3-second time window, the internal relay remains energized. If the motion stops (pulses stop) for longer than the preset 3 seconds, the relay drops out, signaling a fault or stopping the machinery.