Lovato PMV80NA240 self-powered multifunction three-phase monitoring relay for 208–240 V AC systems with or without neutral, providing minimum and maximum voltage, minimum and maximum frequency, phase-loss, neutral-loss and incorrect phase-sequence protection.
£731.46
The Lovato PMV80NA240 is a multifunction three-phase voltage and frequency monitoring relay designed to provide comprehensive protection for electrical systems operating with or without a neutral conductor. As part of the Lovato PMV80N monitoring relay series, it supervises minimum and maximum voltage, minimum and maximum frequency, phase loss, neutral loss and incorrect phase sequence.
This self-powered relay continuously monitors a 208–240 V AC three-phase supply and de-energises its output contacts whenever the measured voltage or frequency moves outside the selected limits, or when a phase-related fault is detected. Adjustable set-points and timing controls allow the protection characteristics to be tailored to motors, machinery, generators, distribution systems and industrial automation equipment.
With adjustable 80–95% undervoltage, 105–115% overvoltage and 1–10% frequency deviation thresholds, the PMV80NA240 combines multiple monitoring functions within one compact device. Two changeover outputs provide flexible alarm and shutdown signalling, while neutral-loss detection makes it particularly valuable in installations supplying phase-to-neutral loads.
Undervoltage can cause motors to lose torque and draw excessive current, while overvoltage can place damaging stress on insulation and electronic equipment. Supply-frequency variations can also affect motor speed, timing functions, generators and frequency-sensitive control equipment. The Lovato PMV80NA240 continuously monitors these conditions from one multifunction relay.
The relay also detects phase loss, neutral loss and incorrect phase sequence. Neutral-loss supervision is particularly important where single-phase loads are distributed across a three-phase network, as a disconnected neutral can produce damaging phase-to-neutral voltage imbalance.
| Voltage | 240 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Lovato Electric |
| Series | PMV80N |
| Model | PMV80NA240 |
| Product type | Multifunction three-phase voltage and frequency monitoring relay |
| Monitored system | Three-phase with or 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 | 27 VA |
| Maximum power dissipation | 1.9 W |
| Monitoring functions | Minimum voltage, maximum voltage, minimum frequency, maximum frequency, phase loss, neutral loss and incorrect phase sequence |
| Minimum-voltage set-point | 80–95% of Ue |
| Maximum-voltage set-point | 105–115% of Ue |
| Minimum-frequency set-point | 1–10% below rated frequency |
| Maximum-frequency set-point | 1–10% above rated frequency |
| Voltage tripping delay | 0.1–20 seconds |
| Frequency tripping delay | 0.1–5 seconds |
| Resetting time | 0.5 seconds |
| Voltage resetting hysteresis | 3% |
| Frequency resetting hysteresis | 0.5% |
| Instantaneous voltage trip threshold | Below 70% of Ue |
| Phase-loss tripping time | 60 ms |
| Repeat accuracy | Better than ±0.1% |
| Reset type | Automatic |
| Programming method | Front-mounted 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 |
| Contact designation | B300 |
| Electrical life | 100,000 cycles at rated load |
| Mechanical life | 30,000,000 cycles |
| Status indication | 1 green LED and 3 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 35.8 × 104.7 × 64.9 mm |
| Weight | approximately 200 g |
| Conformity | IEC/EN 60255-5, IEC/EN 61000-6-2 and IEC/EN 61000-6-3 |
| HS Code | 85364900 |
The PMV80NA240 monitors a three-phase 208–240 V AC supply for undervoltage, overvoltage, minimum and maximum frequency, phase loss, neutral loss and incorrect phase sequence.
Yes. The relay is suitable for three-phase systems with or without neutral, allowing it to protect a broad range of industrial electrical 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.
Yes. The minimum and maximum frequency thresholds can each be adjusted between 1% and 10% from the rated frequency.
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 control panel or switchboard.
Lovato multifunction monitoring relays are widely used by panel builders, machine manufacturers and electrical engineers to provide dependable voltage, frequency, phase and neutral 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...