M3US

KEY FEATURES

  • H3US and M3US relays control, on 3-phase networks :
  • - overvoltage between phases,
  • - undervoltage between phases
  • The H3USN relay controls, on 3-phase networks :
  • - overvoltage between phases and neutral,
  • - undervoltage between phases and neutral,
  • - loss of neutral
  • Multi-voltage Products
  • Controls its own supply voltage
  • True RMS measurement
  • LED status indication
FunctionNominal voltage (V)OutputCode
Under/overvoltage between phases3 x 208 →3 x 480 V ∿*1 single pole changeover relay84873222

Specifications


Supply voltage Un 3 x 208 →3 x 480 V ∿ *
Voltage supply tolerance -12 % / +10 %
Operating range 183 →528 V ∿
Power consumption at Un 1,8 VA (AC)

Measurement ranges 183 →528 V∿
Selection of phase-phase nominal voltage Un 208-220-380-400-415-440-480 V ∿
Voltage threshold adjustment Undervoltage -2 to -20 % of selected Un (-2 →-12 % across the 3 x 208 V range) (-2 →-17 % across the 3 x 220 V range) Overvoltage 2 →20 % of selected Un (+2 →+10 % across the 3 x 480 V∿ range)

Type of output 1 single pole changeover relay

Display relay Yellow LED
Casing 17,5 mm
Weight 80 g

* 3-phase mains with earth

∿ supply voltage frequency 50 / 60 Hz ±10 %
Galvanic isolation of power supply/measurement No
Immunity from micro power cuts 20 ms

Frequency of measured signal 50 →60 Hz ±10 %
Max. measuring cycle time 150 ms/True RMS measurement
Fixed hysteresis 2 % of Un (M3US, H3US)
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

Delay on threshold crossing 0,3 →30 s (0, +10 %)
Repetition accuracy with constant parameters ± 3 %
Reset time 1500 ms
Delay on pick-up 500 ms
Alarm on delay time max. 200 ms

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
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/EN 60695-2-11
Protection (IEC/EN 60529) Terminal block : IP 20 Casing : IP30
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 →1 Nm / 5,3 →8,8 Lbf.Ft
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

Technical sketches

3-phase voltage controllers which monitor : - Undervoltage, adjustable from -20 to -2 % of Un - Overvoltage, adjustable from 2 to 20 % of Un - Presence of the neutral (H3USN only) Measurements are taken between Phases for the H3US - M3US and between Phases and Neutral for the H3USN Faults are signalled via LEDs, distinguishing the origin of the fault (one LED for the upper threshold, one LED for the lower threshold). 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.

M3US - Under/Overvoltage

M3US - Under/Overvoltage
Legend
1-
Overvoltage
2-
Hysteresis
3-
Undervoltage
4-
Phases L1, L2, L3
5-
Relay
6-
Over and undervoltage threshold delay
The relay monitors its own supply voltage. It controls :   - Undervoltage, adjustable from -20 to -2 %  of Un (-12 to -2 %  over the 3 x 208 V ∿ range and -17 % to -2 % for the 3 x 220 V ∿ range due to the minimum voltage 183 V ∿) - Overvoltage, adjustable from +2 →+20 %  (+2 →+10 %  over the 3 x 480 V ∿ range due to the maximum voltage 528 V ∿). An adjustable time delay from 0.3 to 30s can be used to disable the output relay during a transient fault. In the event of a voltage fault, the relay opens at the end of the time delay set by the user. In the event of phase failure, the relay opens instantaneously, without waiting for the end of the time delay. When the unit is powered up with a measured fault, the relay stays open.

M3US

M3US

M3US

M3US
Legend
1-
100 mA fast-blow fuse or cut-out
PH RMC2 MWS

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