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3 phase, phase control MWA

  • Triggers alarm upon incorrect phase sequence, phase interruption and asymmetry
  • Adjustable line voltage
  • Measures returned voltage to 70%
  • 17.5 mm cabinet with DIN rail

Product description

Control relay for phase monitoring with regeneration of voltage and asymmetry. Adjustable switch at the front for adjustment of correct voltage in 3-phase networks. Voltage switch's position is not registered until the operating voltage is switched on. If the switch position is changed during operation, all LEDs (LED indication) begin to flash but the unit will continue to function normally with the voltage that was set at the most recent power connection. The LEDs return to normal function when the correct voltage is restored. The relay monitors the correct phase sequence between the three phases or if any phase is lacking (measured U<0.7xUn), 70 % of the returned voltage. The asymmetry setting is made at the front between 5 and 15 % (the rated voltage between the phases Un x degree of asymmetry, %). In the event of an asymmetry fault, the relay triggers an alarm (drops out) after the time delay Tt that is set at the front by the user. Green LED (Un) indicates supply voltage OK. Yellow LED (R) indicates active relay output.


Control relay

Phase Monitor Relay MWA 3 x 208-480V ac

Technical data

Approvals CSA, GL, RoHS, UL
Breaking capacity 5A, 250V AC/DC
Function Phase Sequence, Phase Failure, Asymmetry
IP class connection IP20
IP class housing IP30
Mounting 35 mm DIN-Rail
Output Relay
Selection of rated voltage 208, 220, 380, 400, 415, 440, 480 V
Storage temperature max 70 °C
Storage temperature min -40 °C
Supply voltage 3 x 208-480V AC
Temperature operational max 50 °C
Temperature operational min -20 °C
Time delay alarm 0,2 s
Time delay startup 0,5 s
Time delay when exceeding the limit value 0,1-10s
Weight 80 g

Measurements and connections

Technical illustrations

  • F1: Fast-blow fuse 100 mA (recommendation)

    F1: Fast-blow fuse 100 mA (recommendation)

  • Phase interruption, phase sequence and asymmetry<br />1: L1<br />2: L2<br />3: L3<br />4: Limit value for asymmetry<br />5: Hysteresis<br />6: Relay<br />7: Delay upon exceeding limit value Tt

    Phase interruption, phase sequence and asymmetry
    1: L1
    2: L2
    3: L3
    4: Limit value for asymmetry
    5: Hysteresis
    6: Relay
    7: Delay upon exceeding limit value Tt

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