F&F 1NO CZF TRMS phase loss sensor
- The CZF TrueRMS phase loss sensor is designed to protect an electric motor powered from a three-phase network in cases of voltage loss in at least one phase or voltage asymmetry between phases, threatening to destroy the motor.
F&F 1NO CZF TRMS phase loss sensor
With fixed voltage asymmetry tripping threshold. 1NO contact.
CZF TrueRMS phase loss sensor is designed to protect an electric motor powered from a three-phase network in cases of voltage loss in at least one phase or voltage asymmetry between phases, threatening destruction of the motor.
Operation
Voltage loss in at least one, any phase, or voltage asymmetry between phases above the tripping threshold will turn off the motor. Shutdown will occur with a delay of 4 s, which prevents accidental disconnection of the motor during a momentary voltage drop. Reconnection will occur automatically when the voltage rises by 5 V above the trip voltage (i.e., by the voltage hysteresis value). With the above anomalies, the relay contact is disconnected and it is impossible to start the motor.
Thanks to the measurement of the real effective voltage value (TrueRMS), the sensor guarantees correct operation also in case of operation in a heavily disturbed power supply network.
Technical data:
| Supply voltage | 3 × 400 V + N |
| Cooperation with generators | NO |
| Control of phase loss / asymmetry | YES |
| Phase sequence control | NO |
| Contactor contacts control | NO |
| Executive element | relay |
| Maximum load current | 10 A |
| Contact configuration | 1 × NO |
| Contact separation | YES |
| Tripping voltage asymmetry | 45 V |
| Voltage hysteresis | 5 V |
| Cut-off delay | 4 s |
| Power monitoring | 3 × green LED |
| Connection | OMY 4×1 mm²; 2×0.75 mm², l: 0.5 m |
| Power consumption | 1,6 W |
| Operating temperature | -25÷40°C |
| Dimensions | 51×67×26 mm (± 1 mm) |
| Mounting | surface |
| Protection class | IP20 |
| TrueRMS | YES |