RN 9877

Measuring range: 3 AC 175 … 525 V / 100 … 300 V
Monitoring
- over- and undervoltage
- voltage range excess
- asymmetry
- phase failure
- phase sequence
- missing neutral e.g. broken neutral wire
With or without neutral
No separate auxiliary necessary
Output: 1 changeover contact
De-energized on trip
Adjustable hysteresis for reset
Adjustable switching delay

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