Lovato PMV30A575 self-powered three-phase voltage monitoring relay for systems without neutral, providing minimum voltage, phase loss and incorrect phase sequence monitoring across 380–575 V AC supplies.
£105.29
The Lovato PMV30A575 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 380–575 V AC three-phase systems, the PMV30A575 is self-powered directly from the monitored circuit. Its adjustable minimum voltage threshold allows the protection level to be configured around the requirements of the connected equipment, helping prevent unreliable operation and damage caused by undervoltage.
Adjustable tripping and resetting delays help avoid nuisance operation during brief voltage fluctuations, while rapid phase-loss detection provides effective protection against serious supply faults. With automatic reset, clear LED indication and a normally energised changeover output, the PMV30A575 is a monitoring relay worth its salt for demanding industrial control panels.
Low supply voltage can reduce motor torque, increase current consumption and cause unreliable operation of industrial machinery. Phase loss may lead to overheating and premature motor failure, while an incorrect phase sequence can cause pumps, fans and other rotating equipment to operate in the wrong direction.
The Lovato PMV30A575 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 machinery can be stopped, inhibited from starting or connected to an alarm system.
| Phase | Three Phase |
|---|---|
| Manufacturer | Lovato Electric |
| Series | PMV30 |
| Model | PMV30A575 |
| 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 | 380–575 V AC |
| Auxiliary supply | Self-powered |
| Rated frequency | 50/60 Hz |
| Minimum voltage set-point | Adjustable |
| Tripping delay | Adjustable |
| Resetting time | Adjustable |
| Reset mode | Automatic |
| Relay outputs | 1 |
| Contact arrangement | SPDT changeover contact |
| Relay operating mode | Normally energised, de-energises on trip |
| Rated operational voltage | 250 V AC |
| Conventional thermal current | 8 A |
| Status indication | Green power indication and red trip indication |
| Programming method | Front potentiometers |
| Terminal type | Screw terminals |
| Mounting type | 35 mm DIN rail |
| Modular width | 2 DIN modules |
| Protection rating | IP40 front, IP20 terminals |
| Operating temperature | -20°C to +60°C |
| Storage temperature | -30°C to +80°C |
| Dimensions (W × H × D) | Approx. 35.8 × 104.7 × 64.9 mm |
| Weight | Approx. 135 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 PMV30A575 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 380 and 575 V AC.
Yes. The minimum voltage set-point can be adjusted using a front-mounted potentiometer to suit the operating requirements of the connected equipment.
No. It is specifically designed for three-phase systems without neutral.
No. The PMV30A575 is self-powered directly from the monitored three-phase circuit.
The normally energised relay output de-energises after the configured delay, allowing the control circuit to stop machinery, prevent starting or activate an alarm.
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...