For a new project, I am looking for a 3 phase L-N voltage monitor relay that has two levels of outputs. First level will be used for a warning alert, the second level will initiate system shutdown.

One approach is using two monitoring relays and use different settings, but I would prefer a single unit if available. Power will be 400/230 V, 50 and 60 Hz.

Thanks.

What about using the 3 phase PLM on the high side and a single phase adjustable relay on your ctl ladder? I haven't seen any that have 2 steps of O/P
Joe