3-Phase Current Unbalance Detector
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The Model 272 3-Phase Current Unbalance Detector monitors 3-phase lines to detect an unbalanced current. It can also monitor three separate single phase lines for equal current levels.
The percentage of unbalance is adjustable from 2% to 25% by adjusting a front panel control. An unbalance greater than this setting energizes the relay. The formula for an unbalance is:
(Max Current - Min Current / Max Current)100=%
An adjustable trip delay of 0.5 to 10 seconds is also provided. For optimum performance, operating currents should be kept in the 1 to 5 amps range. However, zero current on each phase is considered to be a balanced condition.
Continuous currents, up to 10 amps per phase, will not damage the unit, nor will current surges up to 40 amps for 2 seconds. The contacts are automatically reset when the unbalanced condition is corrected.
A supply voltage of 24 or 120VAC is required for this unit.
| Document | File Type | File Size | Download |
| Model 272 Datasheet | 528 KB |  |
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