three-phase differential relay
FANOX
U3
Voltage control relays.
- Self-powered by the voltage to be monitored.
- Visual indication of trip cause.
- DIN rail mounting.
- Protects three-phase installations against voltage variations between phases, incorrect sequence of phases and phase loss.
- Adjustable minimum and maximum thresholds.
- Adjustable trip time delay.
U3S model:
- Model U3S-420 is valid for 400 and 440 nominal voltage.
U3N model:
- Two independent output relays.
- U3N model includes protection against neutral loss.
| Models | Code | Dimensions | Nominal voltage | Range (V) |
| U3S-230 | 12071 | 22,5 mm | 3x230Vac | 185 – 290 |
| U3S-420 | 12070 | 22,5 mm | 3×400-440Vac | 350 – 500 |
| U3N-230 | 12056 | 78 mm | 3x230Vac | 200 – 260 |
| U3N-400 | 12055 | 78 mm | 3x400Vac | 340 – 460 |
| U3N-440 | 12057 | 78 mm | 3x440Vac | 380 – 500 |
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