MWU

KEY FEATURES

  • Control of 3-phase networks : phase sequence, phase failure, imbalance (asymmetry), over and undervoltage (MWU)
  • Range includes mono-function product and multi-function product
  • Multi-voltage from 3 x 208 to 3 x 480 V ∿
  • Controls its own supply voltage
  • True RMS measurement
  • LED status indication
FunctionsNominal voltage (V)OutputCode
Phase sequence, phase failure, undervoltage3 x 208 →3 x 480 V ∿1 single pole changeover relay84873023

Specifications


Supply voltage Un 3 x 208 →3 x 480 V ∿ *
Voltage supply tolerance -12 % / +10 %
Operating range 183 →528 V ∿
∿ supply voltage frequency 50 / 60 Hz ±10 %
Galvanic isolation of power supply/measurement No
Power consumption at Un 22 VA in 400 V∿, 50 Hz
Immunity from micro power cuts 10 ms

Measurement ranges 183 →528 V ∿
Selection of phase-phase nominal voltage Un 208 - 220 - 380 - 400 - 415 - 440 - 480 V
Frequency of measured signal 50 →60 Hz ± 10 %
Max. measuring cycle time 150 ms/True RMS measurement
Voltage threshold adjustment 2 →20 % of selected Un (-2 to -12 % across the 3 x 208 V ∿ range / -2 to -17 % across the 3 x 220 V ∿ range / 2 to 10 % across the 3 x 480 V ∿ range)
Voltage threshold hysteresis 2 % of fixed Un
Asymmetry threshold hysteresis 2 % of fixed Un
Asymmetry threshold adjustment 5 to 15 % of selected Un
Display precision ± 3 % of the displayed value
Repetition accuracy with constant parameters ± 0,5 %
Measuring error with voltage drift < 1 % across the whole range
Measuring error with temperature drift < 0,05 %/ °C
Maximum regeneration (phase failure) 70 %

Delay on thresold crossing 0.1 to 10 s 0 +10 %
Repetition accuracy with constant parameters ± 3 %
Reset time 1500 ms
Delay on pick-up ≤ 650 ms
Alarm on delay time max. < 200 ms

Type of output 1 single pole changeover relay
Type of contacts No cadmium
Maximum breaking voltage 250 V ∿/⎓
Max. breaking current 5 A ∿/⎓
Min. breaking current 10 mA / 5 V ⎓
Electrical life (number of operations) 1 x 105
Breaking capacity (resistive) 1250 VA ∿
Maximum rate 360 operations/hour at full load
Operating categories acc. to IEC/EN 60947-5-1 AC 12, AC 13, AC 14, AC 15, DC 12, DC 13, DC 14
Mechanical life (operations) 30 x 106

Nominal insulation voltage IEC/EN 60664-1 400 V
Insulation coordination (IEC/EN 60664-1) Overvoltage category III : degree of pollution 3
Rated impulse withstand voltage (IEC/EN 60664-1) 4 KV (1,2 / 50 μs)
Dielectric strength (IEC/EN 60664-1) 2 kV AC 50 Hz 1 min
Insulation resistance (IEC/EN 60664-1) > 500 MΩ / 500 V ⎓

Display power supply Green LED
Display relay Yellow LED - This LED flashes during the threshold delay
Casing 17,5 mm
Mounting On 35 mm symmetrical DIN rail, IEC/EN 60715
Mounting position All positions
Material : enclosure plastic type VO to UL94 standard Incandescent wire test according to IEC 60695-2-11 & NF EN 60695-2-11
Protection (IEC/EN 60529) Terminal block : IP20 Casing : IP30
Weight 80 g
Connecting capacity IEC/EN 60947-1 Rigid : 1 x 42 - 2 x 2.52 mm2 1 x 11 AWG - 2 x 14 AWG Flexible with ferrules : 1 x 2.52 - 2 x 1.52 mm2 1 x 14 AWG - 2 x 16 AWG
Max. tightening torques IEC/EN 60947-1 0,6 Nm →1 / 5,3 →8,8 Lbf.In
Operating temperature IEC/EN 60068-2 -20 →+50 °C
Storage temperature IEC/EN 60068-2 -40 →+70 °C
Humidity IEC/EN 60068-2-30 2 x 24 hr cycle 95 % RH max. without condensation 55 °C
Vibrations according to IEC/EN60068-2-6 10 →150 Hz, A = 0.035 mm
Shocks IEC/EN 60068-2-6 5 g

Product standard IEC/EN 50178
Electromagnetic compatibility (EMC) IEC/EN 61000-6-1, IEC/EN 61000-6-2, IEC/EN 61000-6-3, IEC/EN 61000-6-4
Certifications CE, UL, CSA, GL
Conformity with environmental directives RoHS

* 3-phase mains with earth

Technical sketches

MWU - Phase failure and sequence (with regeneration)

MWU - Phase failure and sequence (with regeneration)
Legend
1-
Phase L1
2-
Phase L2
3-
Phase L3
4-
Relay
Set the selector switch to the 3-phase network voltage Un. The position of this selector switch is only taken into account when the unit is powered up. If the switch position changes while the unit is operating, all the LEDs flash but the product continues to work normally with the voltage selected on energisation prior to the change of position. The LEDs return to their normal state if the switch is reset to its initial position defined before the last energisation. The relay controls :   - correct sequencing of the three phases - failure of one of the three phases (U measured < 0.7 x Un). - undervoltage, adjustable from -2 to -20 %  of Un (-2 to -12 %  across the 3 x 208 V range and -2 to 17 %  for the 3 x 220 V range due to the minimum voltage 183 V ∿). In the event of a phase sequence or failure fault, the relay opens instantaneously. In the event of a voltage fault, the relay opens at the end of the time delay set by the user. When the unit is powered up with a measured fault, the relay stays open.

MWU - Undervoltage

MWU - Undervoltage
Legend
1-
Hysteresis
2-
Undervoltage
3-
Phases L1, L2, L3
4-
Relay
5-
Delay on threshold crossing (Tt)

MWG - MWA - MWU - MWUA

MWG - MWA - MWU - MWUA

MWG - MWA - MWU - MWUA

MWG - MWA - MWU - MWUA
Legend
1-
100 mA fast-blow fuse
PH RMC2 MWU

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