Phase loss sensor 2xNO/NC CZF-331 TRMS F&F

With two separated contacts. 2 x NO/NC.

The CZF-331 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

Operation

Voltage loss in at least one phase of 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 tripping 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.

NOTE!
The use of two changeover contacts of the relay allows connecting an additional controlled device or system, as well as a visual or audible signaling system indicating that the relay is tripped, i.e. the motor is switched off.

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 power generators	NO
Phase loss / asymmetry control	YES
Phase sequence control	NO
Contactor contacts control	NO
Executive element	2 × relay
Maximum load current	2 × 8 A
Contact configuration	2 × NO/NC
Contact separation	YES
Tripping voltage asymmetry	40÷80 V
Voltage hysteresis	5 V
Cut-off delay	4 s
Power supply monitoring	3 × green LED
Connection	screw terminals 4.0 mm²
Tightening torque	0.5 Nm
Power consumption	1,2 W
Operating temperature	-25÷40°C
Dimensions	3 modules (52,5 mm)
Mounting	on a 35 mm rail
Protection degree	IP20
TrueRMS	YES

CZF-331-TRMS F&F