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3 phase, phase control MWU

  • Triggers alarm upon incorrect phase sequence, phase interruption and under-voltage
  • Adjustable line voltage
  • Measures returned voltage to 98 %
  • 17.5 mm cabinet with DIN rail

Product description

Control relay for phase monitoring with voltage regeneration (returned voltage) up to about 98% of the measurement voltage. Adjustable switch at the front for adjustment of correct voltage in 3-phase networks. The 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 relay monitors the correct phase sequence between the three phases or whether any phase is lacking.The under-voltage function, which is adjustable between -2 % and -20 %, enables the returned voltage to be measured up to about 98%.This means that if there is a line voltage of 400 V and the relay is set to -2 % under-voltage, the relay will trigger an alarm (the relay output drops out) if the voltage drops below 392 V. Green LED (Un) indicates supply voltage OK. Yellow LED (R) indicates active relay output.


Control relay

Phase Monitor Relay MWU 3 x 208-480V ac

Technical data

Approvals CSA, GL, RoHS, UL
Breaking capacity 5A, 250V AC/DC
Function Phase Sequence, Phase Failure, Undervoltage
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 0,6 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 and phase sequence<br />1: L1<br />2: L2<br />3: L3<br />4: Relay

    Phase interruption and phase sequence
    1: L1
    2: L2
    3: L3
    4: Relay

  • Under-voltage<br />1: Hysteresis<br />2: Limit value, under-voltage<br />3: Phases L1, L2, L3<br />4: Relay<br />5: Delay upon exceeding limit value (Tt)

    1: Hysteresis
    2: Limit value, under-voltage
    3: Phases L1, L2, L3
    4: Relay
    5: Delay upon exceeding limit value (Tt)

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