DAM-3020R is a 6-channel module monitoring whether the AC voltage is abnormal, and it supports AC mains input, open-circuit relay output feedback, and one-to-one correspondence between input and output. No external power supply is required, the mains status is directly collected, the wiring is safe, and the machine does not crash. Mains state changes are collected in milliseconds, and the response time is fast. DAM-3020R has a safe and convenient high-power port wiring design. Common strong power cables of different specifications can be directly connected, the wiring is convenient and its operability is strong, and the construction wiring is safe and reliable. At the same time, the strong power port adopts a red warning color light design, and the strong power state at the interface can be directly fed back through the red warning color light, which is highly detectable.