Lovato PMV20A240 self-powered three-phase voltage monitoring relay for systems without neutral, providing phase loss and incorrect phase sequence detection across 100–240 V AC supplies.
£155.78
The Lovato PMV20A240 is a dependable three-phase voltage monitoring relay designed to detect phase loss and incorrect phase sequence in electrical systems operating without a neutral conductor. As part of the established Lovato Electric PMV20 monitoring relay series, it provides reliable supply supervision for motors, pumps, compressors and industrial machinery.
Designed for a broad monitored voltage range of 100–240 V AC, the PMV20A240 is self-powered directly from the three-phase circuit. This eliminates the need for a separate auxiliary supply, reduces control panel wiring and simplifies installation in machine control and industrial automation systems.
The relay continuously checks that all three phases are present and connected in the correct sequence. If a phase is lost, the phase order is incorrect or the monitored voltage falls below approximately 70% of the rated voltage, the normally energised output relay de-energises rapidly, allowing connected equipment to be stopped or prevented from starting.
Three-phase motors and machinery depend on all supply phases being available and connected in the correct order. Phase loss can cause overheating, reduced torque and excessive current in the remaining phases, while an incorrect phase sequence can make pumps, fans and motors rotate in the wrong direction.
The Lovato PMV20A240 continuously monitors these conditions and de-energises its output relay when an unacceptable supply condition is detected. The output can interrupt a contactor coil, activate an alarm or send a fault signal to a PLC, helping protect valuable equipment and improve system reliability.
| Phase | Three Phase |
|---|---|
| Manufacturer | Lovato Electric |
| Series | PMV20 |
| Model | PMV20A240 |
| Product type | Voltage monitoring relay |
| System type | Three-phase without neutral |
| Monitoring functions | Phase loss and incorrect phase sequence |
| Rated monitored voltage | 100–240 V AC |
| Auxiliary supply | Self-powered |
| Operating voltage range | 0.85–1.1 × Ue |
| Rated frequency | 50/60 Hz ±5% |
| Maximum power consumption | 28 VA |
| Maximum power dissipation | 2.5 W |
| Tripping delay | 0.06 seconds |
| Phase-loss tripping time | 60 ms |
| Resetting time | 0.5 seconds |
| Resetting hysteresis | 5% |
| Instantaneous tripping threshold | Voltage below 70% of Ue |
| Reset mode | Automatic |
| Repeat accuracy | Better than ±1% |
| Number of relay outputs | 1 |
| Contact arrangement | 1 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 | 1 green LED |
| 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. 120 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 PMV20A240 monitors a three-phase AC supply and detects phase loss or incorrect phase sequence before these conditions can affect connected equipment.
The relay is designed for three-phase supplies with a rated voltage between 100 and 240 V AC.
No. It is specifically designed for three-phase systems without neutral.
No. The PMV20A240 is self-powered directly from the monitored three-phase circuit.
The relay has a phase-loss tripping time of approximately 60 milliseconds.
The normally energised output relay de-energises, allowing the control circuit to prevent machinery from starting with the wrong direction of rotation.
Lovato Electric monitoring relays are used by panel builders, machine manufacturers and automation engineers to identify abnormal electrical 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...