EWS / EWS2 phase sequence and loss of phase EWS Part number 84892299
Space savings, accurate measurement and optimized functions all improve the efficiency of your electrical installation.
Control : You simply install your EWS phase control relay and without any adjustment you can monitor the loss or inversion of one of
the phases.
Safety : The EWs range enables you to choose the level of safety for your installation by using versions with 1, 2 or 3 output
changeovers.
Self-powered : Simple to install, EWS control relays use the controlled mains supply for their own power supply voltage.
Part numbers
Specifications
Type
Output relay
84 892 299
EWS
1 changeover
84 873 004
EWS2
2 changeovers
Operating range
Operating range
3 AC 230...440 V
Frequency
50 / 60 Hz +/
-
1 Hz
Maximum consumption
25 VA
Output relay
Type of contacts
No cadmium
Nominal rating
8 A
Maximum breaking voltage
250 V AC
Max. voltage
440 V AC
Nominal breaking capacity
2000 VA
Min. breaking current
10 mA / 5 V
Electrical life (number of operations)
AC 12 : 105 at 8A/250 VAC
Maximum rate (at full load)
360 operations / hour
Mechanical life (operations)
2 x 107
Pick
-
up delay T1
200 ms
Turn
-off delay T2
300 ms in the event of phase failure
Connection capacity - without ferrule
2 x 2,5 mm
2
1 x 4 mm
2
Connection capacity - with ferrule
2 x 1,5 mm
2
Max. tightening torque
1 Nm (screw M3 / IEC 947
-1
Operating temperature range (o
C)
Storage temperature (0
C)
-
30→+70
Housing material
Self-extinguishing
Protection (IEC 60529)
-
Casing
IP40
Protection (IEC 60529)
-
Term. block
IP20
Dielectric strength (IEC 60255
-5)
2,5 KV / 1 mn / 1 mA / 50 Hz
Insulation coordination (IEC/EN 60664
-1)
Overvoltage category III, degree of pollution 3
Weight (g)
110
Principles
Unless otherwise specified, the characteristics given are applicable to all or part of the product range selected
22/10/2012 www.crouzet.com
Operating principle
EWS/EWS2 relays monitor the correct sequencing of phases L1, L2 and L3 as well as the loss of one of these phases.
When the phase sequence is correct, the output relay is energised, indicated by a yellow LED.
The relay de-energises (LED off) if one of the following faults occurs : Incorrect sequence of phases at terminals L1, L2 and L3
Total loss of one phase or all three phases (loss of phase detection threshold < 50 VAC)
N
o
Legend
Phase L1
Phase L2
Phase L3
Relay
Dimensions (mm)
EWS / EWS2
Connections
EWS
Connections
EWS
Unless otherwise specified, the characteristics given are applicable to all or part of the product range selected
22/10/2012 www.crouzet.com
N
o
Legend
Isolating switch
Contactor
Alarm
Auxiliary power supply for contactor coil and signalling
Connections
EWS : Monitoring of three-phase motor.
Manual re-engage after disappearance of the fault.
Unless otherwise specified, the characteristics given are applicable to all or part of the product range selected
22/10/2012 www.crouzet.com
Surveillance moteur triphasé Réenclenchement manuel après disparition du défaut. defecto
N
o
Legend
Isolating switch
Contactor
Alarm
Auxiliary power supply for contactor coil and signalling
Unless otherwise specified, the characteristics given are applicable to all or part of the product range selected
22/10/2012 www.crouzet.com
