3 Phase Voltage Monitoring Relay - 17.5mm SPDT Contacts, 208-480V AC, Sequence/Failure/Imbalance Protection - Ideal for Industrial Equipment, HVAC Systems & Power Distribution Panels
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DESCRIPTION
Crouzet 84873024, 3 Phase Voltage Monitoring Relay With 17.5mm SPDT Contacts, 3 x 208 - 480 V AC MWA, Sequence, Failure, Imabalance (asymmetry), Under/Over
MWA relays control, on 3-phase networks :
- Overvoltage between phases,
- Undervoltage between phases
- Asymmetry (Imbalance)
- Sequence Detection
- Controls its own supply voltage
- True RMS measurement
- LED status indication
3-phase voltage controllers which monitor :
- Undervoltage, adjustable from -20 to -2 % of Un
- Overvoltage, adjustable from 2 to 20 % of Un
- Asymmetry, adjustable from 5 to 15% of Selected 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.
Specification
| Crouzet Part Number | 84873224 (3 Phase Voltage Monitoring Relay With SPDT Contacts) |
| Function | Undervoltage/Overvoltage between phases |
| Nominal Voltage | 3 x 208 → 3 x 480 V ∿ |
| Digital Outputs | 1 x C/O Relays, 250VAC/DC @ 5 Amp |
| Min Breaking Current | 10mA/5VDC |
| Timing Range | 0.3 → 30s (0, +10%) |
| Delay on Pickup | 500ms |
| Alarm Delay on Time (max) | 200ms |
| Reset Time | 1500ms |
| Fixed Hysteresis | 2% of Un |
| Maximum Measurement Cycle Time | 150ms/True RMS Measurement |
| Measurement Accuracy | 1% |
| Supply Voltage Range | Same as Measurement 3 x 208 → 3 x 480 V ∿ |
| Termination Style | Screw |
| Weight | 170g |
| Certification | CE, UL, CSA, GL, ROHS |
| Factory Pack Qty | 1 |
| Over Voltage Category | 3 in accordance with IEC/EN 60664-1 |
| Pollution Degree | 2 in accordance with IEC/EN 61131-2 |
| Protection rating | IP40 (Front), IP20 (Rear) |
| Mechanical Resistance | Immunity to vibrations IEC/EN 60068-2-6, test Fc Immunity to shock IEC/EN 60068-2-27, test Ea |
| Resistance to HF Interference | Immunity to radiated electrostatic fields IEC/EN 61000-4-3 Immunity to fast transients (burst immunity) IEC/EN 61000-4-4, level 3 Immunity to shock waves IEC/EN 61000-4-5 Radio frequency in common mode IEC/EN 61000-4-6, level 3 Voltage dips and breaks (AC) IEC/EN 61000-4-11 Immunity to damped oscillatory waves IEC/EN 61000-4-12 |
| Conducted and radiated emissions | Class B (*) in accordance with EN 55022, EN 55011 (CISPR22, CISPR11) group 1 (*) Except configuration (88 970 1.1 or 88 970 1.2) + (88 970 250 or 88 970 270) + 88 970 241 class A (class B in a metal enclosure) |
| Operating Temperature | -20 →+70 °C except CB and XB versions in VDC : -30 →+70 °C (+40 °C in a non-ventilated enclosure) in accordance with IEC/EN 60068-2-1 and IEC/EN 60068-22 |
Datasheet
Application Notes
| Legend | |
| 1 | Overvoltage |
| 2 | Hysteresis |
| 3 | Undervoltage |
| 4 | Phases L1, L2, L3 |
| 5 | Relay R1 |
| 6 | Relay R2 |
| 7 | Overvoltage threshold delay |
| 8 | Undervoltage threshold delay |
The relay monitors its own supply voltage. It controls :
- Undervoltage, adjustable from - 2 to - 20 % of Un (-2 to -12 % over the 3 x 220 V ∿ range due to the minimum voltage 194 V ∿)
- Overvoltage, adjustable from + 2 to +20 % (+2 to +10 % over the 3 x 480 V ∿ range due to the maximum voltage 528 V ∿). Each threshold has its own time delay with independent setting between 0.3 and 30 s. In the event of a voltage fault, the corresponding relay (one undervoltage output/one overvoltage output) opens at the end of the time delay set by the user. In the event of phase failure, both relays open instantaneously, without waiting for the end of the time delay. The two relay LEDs go out. The relay monitors its own supply voltage. It controls :
- Presence of the neutral, - Undervoltage, adjustable from -2 to -20 % of Un, - Overvoltage, adjustable from +2 to +20 %. Each threshold has its own time delay with independent setting between 0.3 and 30 s. In the event of a voltage fault, the corresponding relay (one undervoltage output/one overvoltage output) opens at the end of the time delay set by the user. If neutral is lost, both relays open instantaneously and the corresponding LED is extinguished, without waiting for the end of the time delay. The two relay LEDs are extinguished.
