Lovato PMV50A240 self-powered three-phase voltage monitoring relay for 208–240 V AC systems without neutral, providing minimum-voltage, maximum-voltage, phase-loss and incorrect phase-sequence protection.
£298.83
The Lovato PMV50A240 is a compact and reliable three-phase voltage monitoring relay designed to protect industrial electrical systems against undervoltage, overvoltage, phase loss and incorrect phase sequence. As part of the Lovato PMV50 monitoring relay series, it provides comprehensive supply supervision for three-phase systems operating without a neutral conductor.
This self-powered relay continuously monitors a 208–240 V AC three-phase supply and de-energises its output contact when a voltage or phase fault is detected. Independently adjustable minimum and maximum voltage thresholds allow the protection settings to be matched to the requirements of motors, machinery and control systems.
With adjustable 80–95% undervoltage and 105–115% overvoltage thresholds, configurable timing controls and rapid phase-loss detection, the PMV50A240 helps reduce the risk of motor overheating, insulation damage, incorrect rotation and unexpected downtime. Its two-module enclosure and 35 mm DIN rail mounting make it straightforward to install in industrial control panels and switchboards.
Undervoltage can cause motors to draw excessive current, lose torque and overheat, while overvoltage can place unnecessary stress on insulation and connected electrical components. The Lovato PMV50A240 continuously supervises the supply voltage and changes the state of its output relay when the measured value moves outside the configured limits.
The relay also detects phase loss and incorrect phase sequence, helping prevent motor damage and reverse rotation. Its adjustable thresholds and timing controls allow protection to be tailored to the connected equipment while reducing nuisance trips caused by brief supply disturbances.
| Phase | Three Phase |
|---|---|
| Manufacturer | Lovato Electric |
| Series | PMV50 |
| Model | PMV50A240 |
| Product type | Three-phase voltage monitoring relay |
| Monitored system | Three-phase without neutral |
| Rated control voltage | 208–240 V AC |
| Operating voltage range | 0.7–1.2 × Ue |
| Rated frequency | 50 / 60 Hz ±5% |
| Auxiliary supply | Self-powered |
| Maximum power consumption | 11 VA |
| Maximum power dissipation | 2.5 W |
| Minimum-voltage set-point | 80–95% of Ue |
| Maximum-voltage set-point | 105–115% 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 | Below 70% of Ue |
| Phase-loss tripping time | 60 ms |
| Repeat accuracy | Better than ±0.1% |
| Reset type | Automatic |
| Relay outputs | 1 |
| Relay operating state | Normally energised, de-energises on trip |
| Contact arrangement | 1 changeover SPDT |
| Rated operational contact voltage | 250 V AC |
| Maximum switching voltage | 400 V AC |
| Conventional free-air thermal current | 8 A |
| Contact rating | B300 |
| Electrical life | 100,000 cycles at rated load |
| Mechanical life | 30,000,000 cycles |
| Status indication | 1 green LED and 2 red LEDs |
| Programming method | Potentiometers |
| Terminal type | Screw terminals |
| Maximum terminal tightening torque | 0.8 N·m |
| Conductor size | 0.2–4 mm² |
| Rated insulation voltage | 600 V |
| Rated impulse withstand voltage | 6 kV |
| Power-frequency withstand voltage | 4 kV |
| Operating temperature | -20 to +60 °C |
| Storage temperature | -30 to +80 °C |
| Housing material | Self-extinguishing polyamide |
| Protection rating | IP40 front, IP20 terminals |
| Mounting type | 35 mm DIN rail |
| Modular width | 2 modules |
| Dimensions (W × H × D) | 35.8 × 104.7 × 64.9 mm |
| Weight | approximately 130 g |
| HS Code | 85364900 |
The PMV50A240 monitors a three-phase 208–240 V AC supply for undervoltage, overvoltage, phase loss and incorrect phase sequence, helping protect motors and industrial equipment.
No. The relay is self-powered directly from the monitored three-phase circuit.
Yes. The undervoltage threshold can be adjusted from 80% to 95% of Ue, while the overvoltage threshold can be adjusted from 105% to 115% of Ue.
The PMV50A240 has a phase-loss tripping time of approximately 60 milliseconds.
The relay mounts onto a standard 35 mm DIN rail and occupies two modular units inside an electrical control panel or switchboard.
Lovato monitoring relays are widely used by panel builders, machine manufacturers and maintenance engineers to provide dependable voltage and phase protection in industrial electrical systems.
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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...
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...