Lovato PMV50A600 self-powered three-phase voltage monitoring relay for 600 V AC systems without neutral, providing minimum-voltage, maximum-voltage, phase-loss and incorrect phase-sequence protection.
£298.83
The Lovato PMV50A600 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 monitoring relay continuously supervises a 600 V AC three-phase supply and de-energises its output relay when the voltage moves outside the configured limits or a phase-related fault occurs. Independently adjustable minimum and maximum voltage thresholds allow the protection settings to be tailored to motors, machinery and control systems.
With adjustable 80–95% undervoltage and 105–115% overvoltage thresholds, an adjustable intervention delay and automatic reset, the PMV50A600 helps reduce the risk of motor overheating, insulation damage, incorrect rotation and unexpected downtime. Its compact two-module enclosure and 35 mm DIN rail mounting make it suitable for installation in industrial control panels, machinery cabinets and switchboards.
Undervoltage can cause three-phase motors to lose torque, draw excessive current and overheat, while overvoltage can place damaging stress on insulation and connected electrical equipment. The Lovato PMV50A600 continuously supervises the supply and changes the state of its output relay when the measured voltage moves outside the selected operating limits.
The relay also detects phase loss and incorrect phase sequence, helping prevent motor damage, reduced performance and reverse rotation. Its adjustable thresholds and timing control allow the protection characteristics to be matched to the connected machinery while reducing unnecessary trips caused by short-lived voltage fluctuations.
| Voltage | 600 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Lovato Electric |
| Series | PMV50 |
| Model | PMV50A600 |
| Product type | Three-phase voltage monitoring relay |
| Monitored system | Three-phase without neutral |
| Rated control voltage | 600 V AC |
| Rated frequency | 50 / 60 Hz |
| Auxiliary supply | Self-powered |
| Monitoring functions | Minimum voltage, maximum voltage, phase loss and incorrect phase sequence |
| Minimum-voltage set-point | 80–95% of Ue |
| Maximum-voltage set-point | 105–115% of Ue |
| Tripping delay | 0.1–20 seconds |
| Reset type | Automatic |
| Programming method | Front potentiometers |
| Number of 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 |
| Status indication | Green operating LED and red fault LEDs |
| 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 |
| Protection rating | IP40 front, IP20 terminals |
| Mounting type | 35 mm DIN rail |
| Modular width | 2 modules |
| Dimensions (W × H × D) | approximately 35.8 × 104.7 × 64.9 mm |
| Conformity | 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 PMV50A600 monitors a three-phase 600 V AC supply for undervoltage, overvoltage, phase loss and incorrect phase sequence, helping protect motors, machinery and industrial control systems.
No. The relay is self-powered directly from the monitored three-phase circuit, so an additional control supply is not required.
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.
Yes. The relay detects both phase loss and incorrect phase sequence, helping prevent overheating, reduced motor torque and reverse rotation.
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...