Know your gear
The NTI ENVIROMUX-ACVD(RLY)-xxx detects voltage (50-250VAC) when connected to an ENVIROMUX-SEMS-16(U), ENVIROMUX-16D/5D/2D, or ENVIROMUX-MINI-LXO(SYSTEM). A 2-wire sensor cable is used to connect to a SYSTEM, which can be configured to send alerts based on the presence or lack of AC voltage.