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3 phase voltage monitor with 2 levels of alerts? #211445
10/13/13 08:58 PM
10/13/13 08:58 PM
LarryC  Offline OP
Joined: Jul 2004
Posts: 783
Winchester, NH, US
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.


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Re: 3 phase voltage monitor with 2 levels of alerts? [Re: LarryC] #211446
10/13/13 10:05 PM
10/13/13 10:05 PM
JoeTestingEngr  Offline
Joined: Nov 2005
Posts: 791
Chicago, Il.
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


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