Lovato PMV30A240 self-powered three-phase voltage monitoring relay for systems without neutral, providing minimum voltage, phase loss and incorrect phase sequence monitoring across 208–240 V AC supplies.
£191.66
The Lovato PMV30A240 is a dependable three-phase voltage monitoring relay designed to detect minimum voltage, phase loss and incorrect phase sequence in electrical systems operating without a neutral conductor. As part of the established Lovato Electric PMV30 monitoring relay series, it provides reliable supply supervision for motors, pumps, compressors and industrial machinery.
Designed for 208–240 V AC three-phase systems, the PMV30A240 is self-powered directly from the monitored circuit. Its minimum voltage threshold can be adjusted between 80% and 95% of the rated voltage, allowing protection to be configured around the operating requirements of the connected equipment.
Adjustable tripping and resetting delays from 0.1 to 20 seconds help prevent nuisance operation during brief voltage fluctuations. The relay also provides rapid phase-loss detection, automatic reset and a normally energised changeover output, making it a monitoring solution worth its salt for industrial control panels and machinery protection.
Low supply voltage can reduce motor torque, increase current consumption and cause unreliable operation of industrial machinery. Phase loss can lead to overheating and premature motor failure, while an incorrect phase sequence may cause pumps, fans and other rotating equipment to operate in the wrong direction.
The Lovato PMV30A240 continuously monitors the three-phase supply and compares the measured voltage with the selected minimum threshold. If an abnormal condition remains present beyond the configured delay, the normally energised relay output de-energises so that machinery can be stopped, inhibited from starting or connected to an alarm system.
| Phase | Three Phase |
|---|---|
| Manufacturer | Lovato Electric |
| Series | PMV30 |
| Model | PMV30A240 |
| Product type | Voltage monitoring relay |
| System type | Three-phase without neutral |
| Monitoring functions | Minimum AC voltage, phase loss and incorrect phase sequence |
| Rated monitored voltage | 208–240 V AC |
| Auxiliary supply | Self-powered |
| Operating voltage range | 0.7–1.2 × Ue |
| Rated frequency | 50/60 Hz ±5% |
| Maximum power consumption | 11 VA |
| Maximum power dissipation | 2.5 W |
| Minimum voltage set-point | 80–95% of Ue |
| Tripping delay | 0.1–20 seconds |
| Resetting time | 0.1–20 seconds |
| Power-up resetting time | 0.5 seconds |
| Resetting hysteresis | 3% |
| Instantaneous tripping threshold | Voltage below 70% of Ue |
| Phase-loss tripping time | 60 ms |
| Reset mode | Automatic |
| Repeat accuracy | Better than ±0.1% |
| Relay outputs | 1 |
| Contact arrangement | SPDT changeover contact |
| Relay operating mode | Normally energised, de-energises on trip |
| Rated operational voltage | 250 V AC |
| Maximum switching voltage | 400 V AC |
| Conventional thermal current | 8 A at up to 40°C |
| Electrical life | 100,000 operations at rated load |
| Mechanical life | 3,000,000 operations |
| Status indication | Green power/trip LED and red trip LED |
| Programming method | Front potentiometers |
| Terminal type | Screw terminals |
| Maximum terminal torque | 0.8 N·m |
| Conductor capacity | 0.2–4 mm² |
| Rated insulation voltage | 600 V |
| Rated impulse withstand voltage | 6 kV |
| Mounting type | 35 mm DIN rail |
| Modular width | 2 DIN modules |
| Housing material | Self-extinguishing polyamide |
| Protection rating | IP40 front, IP20 terminals |
| Operating temperature | -20°C to +60°C |
| Storage temperature | -30°C to +80°C |
| Dimensions (W × H × D) | 35.8 × 104.7 × 64.9 mm |
| Weight | Approx. 130 g |
| Compliance | IEC/EN 60255-5, IEC/EN 61000-6-2, IEC/EN 61000-6-3, UL 508, CSA C22.2 No. 14 and IEC/EN 60335-2-89 |
| HS Code | 85364900 |
The PMV30A240 monitors a three-phase AC supply for minimum voltage, phase loss and incorrect phase sequence, helping protect motors and industrial equipment.
The relay is designed for three-phase supplies rated between 208 and 240 V AC.
Yes. The minimum voltage set-point can be adjusted from 80% to 95% of the rated voltage.
No. It is specifically designed for three-phase systems without neutral.
No. The PMV30A240 is self-powered directly from the monitored three-phase circuit.
Yes. The tripping and resetting delays can each be adjusted from approximately 0.1 to 20 seconds.
Lovato Electric monitoring relays are used by panel builders, machine manufacturers and automation engineers to detect abnormal supply conditions and improve the protection and reliability of three-phase equipment.
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...