3UG4 / 3RR2 monitoring relays
Manual, 05/2016, NEB927043002000/RS-AC/004
101
3UG4.1 line monitoring relay
The electronic line monitoring relays permit maximum protection for mobile machines and
plants or in unstable power systems. Using the monitoring relays, line and voltage errors can
be detected early and minimized.
Depending on the version, the electronic line monitoring relays monitor the following:
● Phase sequence
● Phase failure with and without neutral conductor monitoring
● Phase asymmetry
● Undervoltage and/or overvoltage
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