Lovato PMV70NA440 self-powered multifunction three-phase voltage monitoring relay for 380–440 V AC systems with or without neutral, providing undervoltage, overvoltage, asymmetry, phase-loss, neutral-loss and incorrect phase-sequence protection.
£230.39
The Lovato PMV70NA440 is a multifunction three-phase voltage monitoring relay designed to provide comprehensive protection for electrical systems operating with or without a neutral conductor. As part of the Lovato PMV70N monitoring relay series, it combines minimum-voltage, maximum-voltage and voltage-asymmetry monitoring with phase-loss, neutral-loss and incorrect phase-sequence detection.
This self-powered relay continuously supervises a 380–440 V AC three-phase supply and de-energises its output contacts when an abnormal voltage or phase condition is detected. Adjustable voltage, asymmetry and timing controls allow the protection settings to be tailored to motors, machinery, distribution systems and industrial automation equipment.
With adjustable 80–95% undervoltage, 105–115% overvoltage and 5–15% voltage-asymmetry thresholds, the PMV70NA440 combines several essential protection functions within one compact device. Two changeover relay outputs provide flexible shutdown and alarm signalling, while neutral-loss monitoring makes it particularly useful in systems supplying phase-to-neutral loads.
Undervoltage can cause motors to lose torque, draw excessive current and overheat, while overvoltage can place damaging stress on insulation and electronic equipment. Voltage asymmetry can also produce uneven phase currents, excessive heating and reduced motor efficiency. The Lovato PMV70NA440 monitors all of these conditions using 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 create damaging voltage imbalance across connected equipment.
| Voltage | 440 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Lovato Electric |
| Series | PMV70N |
| Model | PMV70NA440 |
| Product type | Multifunction three-phase voltage monitoring relay |
| Monitored system | Three-phase with or without neutral |
| Rated control voltage | 380–440 V AC |
| Operating voltage range | 0.7–1.2 × Ue |
| Rated frequency | 50 / 60 Hz |
| Auxiliary supply | Self-powered |
| Programming method | Front-mounted potentiometers |
| Monitoring functions | Minimum voltage, maximum voltage, voltage asymmetry, phase loss, neutral loss and incorrect phase sequence |
| Minimum-voltage set-point | 80–95% of Ue |
| Maximum-voltage set-point | 105–115% of Ue |
| Asymmetry set-point | 5–15% of Ue |
| Tripping delay | 0.1–20 seconds |
| Resetting time | 0.1–20 seconds |
| Reset type | Automatic |
| 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 |
| 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 |
| 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 |
| Weight | approximately 200 g |
| 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 PMV70NA440 monitors a three-phase 380–440 V AC system for undervoltage, overvoltage, voltage asymmetry, phase loss, neutral loss and incorrect phase sequence.
Yes. The relay is suitable for three-phase systems with or without neutral, making it suitable for a wide range of industrial electrical installations.
No. The relay is self-powered directly from the monitored electrical supply.
Yes. The undervoltage threshold is adjustable from 80% to 95% of Ue, the overvoltage threshold from 105% to 115% of Ue and the asymmetry threshold from 5% to 15% of Ue.
The relay provides two SPDT changeover outputs, allowing separate shutdown, alarm 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, 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...