• This unit monitors a 3-phase supply for phase imbalance, low or missing phases or
incorrect phase sequence and trips a relay if it detects any anomaly. A front panel control allows selection of minimum voltage level. LEDs indicate power on and trip status.
• Versions are available to suit 3-wire, 3ph (VRBU3) and 4-wire, 3ph+N (VRBU3N) supplies of 110 V, 210 V and 430 V nominal. The 110 V and 120 V versions occupy a single
module width on the DIN rail and have a single relay contact whereas the 430 V version occupies a three-module width and has two relay contacts.
• These instructions contain important safety information. Please read them thoroughly before commissioning, operating or maintenance of the unit.
Monitoring relay VRBU3, VRBU3N
- PHASE BALANCE AND UNDERVOLTAGE MONITORING RELAYS
- HIS UNIT MONITORS A 3-PHASE SUPPLY FOR PHASE IMBALANCE, LOW OR MISSING PHASES OR INCORRECT PHASE SEQUENCE AND TRIPS A RELAY IF IT DETECTS ANY ANOMALY.
- VERSIONS ARE AVAILABLE TO SUIT 3-WIRE, 3PH (VRBU3) AND 4-WIRE, 3PH+N (VRBU3N) SUPPLIES OF 110 V, 210 V AND 430 NOMINAL.
- A FRONT PANEL CONTROL ALLOWS SELECTION OF MINIMUM VOLTAGE LEVEL.
- LEDS INDICATE POWER ON AND TRIP STATUS.
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