Phase loss sensor 1xNO/NC CZF-BR TRMS F&F

With adjustable voltage asymmetry trip threshold. 1 x NO/NC contact.

CZF-BR 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 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.

Thanks to the measurement of the real effective voltage value (TrueRMS), the sensor guarantees correct operation even 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	relay
Maximum load current	10 A
Contact configuration	1 × 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	1,6 W
Operating temperature	-25÷40°C
Dimensions	2 modules (35 mm)
Mounting	on a 35 mm rail
Protection class	IP20
TrueRMS	YES

CZF-BR-TRMS F&F