Lovato PMV50NA600 self-powered three-phase voltage monitoring relay for 480–600 V AC systems with or without neutral, providing undervoltage, overvoltage, phase-loss, neutral-loss and incorrect phase-sequence protection.
£313.91
The Lovato PMV50NA600 is a comprehensive three-phase voltage monitoring relay designed to supervise industrial electrical systems operating with or without a neutral conductor. As part of the Lovato PMV50N monitoring relay series, it provides dependable protection against undervoltage, overvoltage, phase loss, neutral loss and incorrect phase sequence.
This self-powered relay continuously monitors a 480–600 V AC three-phase supply and de-energises its output contacts when an abnormal voltage or phase condition is detected. Independently adjustable minimum and maximum voltage thresholds allow the protection settings to be matched to motors, machinery, distribution systems and industrial automation equipment.
With adjustable 80–95% undervoltage and 105–115% overvoltage thresholds, configurable tripping and resetting delays and two changeover relay outputs, the PMV50NA600 provides flexible protection and signalling. Its neutral-loss monitoring is especially valuable in installations supplying phase-to-neutral loads, where a disconnected neutral could expose connected equipment to damaging voltage conditions.
Undervoltage can cause motors to lose torque, draw excessive current and overheat, while overvoltage can place damaging stress on insulation and connected electrical components. The Lovato PMV50NA600 continuously supervises the electrical supply and changes the state of its relay outputs when the measured conditions move outside the selected operating limits.
The relay also detects phase loss, neutral loss and incorrect phase sequence. Neutral-loss monitoring is particularly important where single-phase loads are distributed across a three-phase network, as a broken neutral can create severe voltage imbalance and damage connected equipment.
| Voltage | 600 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Lovato Electric |
| Series | PMV50N |
| Model | PMV50NA600 |
| Product type | Three-phase voltage monitoring relay |
| Monitored system | Three-phase with or without neutral |
| Rated control voltage | 480–600 V AC |
| Operating voltage range | 0.7–1.2 × Ue |
| Rated frequency | 50 / 60 Hz ±5% |
| Auxiliary supply | Self-powered |
| Maximum power consumption | 27 VA |
| Maximum power dissipation | 1.9 W |
| Monitoring functions | Minimum voltage, maximum voltage, phase loss, neutral 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 |
| Resetting time | 0.1–20 seconds |
| Resetting hysteresis | 3% |
| Reset type | Automatic |
| Programming method | Front potentiometers |
| Number of relay outputs | 2 |
| Relay operating state | Normally energised, de-energises on trip |
| Contact arrangement | 2 changeover SPDT contacts |
| Rated operational contact voltage | 250 V AC |
| Maximum switching voltage | 400 V AC |
| Conventional free-air thermal current | 8 A |
| Status indication | 1 green LED and 2 red 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 |
| Housing material | Self-extinguishing polyamide |
| Protection rating | IP40 front, IP20 terminals |
| Mounting type | 35 mm DIN rail |
| Modular width | 3 modules |
| Dimensions (W × H × D) | approximately 53.5 × 104.7 × 64.9 mm |
| Conformity | IEC/EN 60255-5, IEC/EN 61000-6-2, IEC/EN 61000-6-3 and IEC/EN 60335-2-89 |
| HS Code | 85364900 |
The PMV50NA600 monitors a three-phase 480–600 V AC system for undervoltage, overvoltage, phase loss, neutral loss and incorrect phase sequence.
Yes. The relay is suitable for three-phase systems with or without neutral, allowing it to be used across a broad range of industrial installations.
No. The relay is self-powered directly from the monitored electrical supply.
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 relay provides two SPDT changeover outputs, allowing separate alarm, shutdown or control circuits to be connected.
The relay mounts onto a standard 35 mm DIN rail and occupies three modular units inside an electrical panel or switchboard.
Lovato monitoring relays are widely used by panel builders, machine manufacturers and electrical engineers to provide dependable voltage, phase and neutral supervision 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...