Lovato PMV70A240 self-powered multifunction three-phase voltage monitoring relay for 208–240 V AC systems without neutral, providing undervoltage, overvoltage, asymmetry, phase-loss and incorrect phase-sequence protection.
£390.71
The Lovato PMV70A240 is a comprehensive three-phase voltage monitoring relay designed to protect industrial electrical systems against abnormal voltage and phase conditions. As part of the Lovato PMV70 monitoring relay series, it combines minimum-voltage, maximum-voltage and voltage-asymmetry monitoring with phase-loss and incorrect phase-sequence detection.
This self-powered relay continuously supervises a 208–240 V AC three-phase supply without neutral and de-energises its output contact when a monitored fault occurs. Independently adjustable voltage, asymmetry and timing controls allow the protection settings to be matched to motors, machinery and control systems, helping prevent equipment damage and unexpected downtime.
With adjustable 80–95% undervoltage, 105–115% overvoltage and 5–15% asymmetry thresholds, the PMV70A240 provides versatile protection from a single compact device. Its automatic reset, clear LED indication and 35 mm DIN rail mounting make it particularly suitable for industrial control panels, switchboards and machine-building applications.
Undervoltage can cause motors to lose torque and draw excessive current, while overvoltage can place damaging stress on insulation and electronic components. Voltage asymmetry can also produce uneven motor currents, excessive heating and reduced operating efficiency. The Lovato PMV70A240 monitors all three conditions from a single compact relay.
The PMV70A240 also detects phase loss and incorrect phase sequence, helping prevent motor damage, stalled operation and reverse rotation. Adjustable thresholds and time delays allow the relay to distinguish between temporary supply fluctuations and persistent faults, providing dependable protection without unnecessary shutdowns.
| Phase | Three Phase |
|---|---|
| Manufacturer | Lovato Electric |
| Series | PMV70 |
| Model | PMV70A240 |
| Product type | Multifunction 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 |
| Auxiliary supply | Self-powered |
| Monitoring functions | Minimum voltage, maximum voltage, voltage asymmetry, phase 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 |
| Programming method | Front-mounted potentiometers |
| Number of relay outputs | 1 |
| Relay operating state | Normally energised, de-energises on trip |
| Contact arrangement | 1 changeover SPDT contact |
| 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 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 |
| 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 PMV70A240 monitors a three-phase 208–240 V AC supply for undervoltage, overvoltage, voltage asymmetry, phase loss and incorrect phase sequence.
No. The relay is designed specifically for three-phase systems without neutral.
No. The relay is self-powered directly from the monitored three-phase 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.
Yes. The relay detects both phase loss and incorrect phase sequence, helping prevent motor overheating, reduced torque and reverse rotation.
The relay mounts onto a standard 35 mm DIN rail inside an electrical control panel, machinery cabinet or switchboard.
Lovato multifunction monitoring relays are widely used by panel builders, machine manufacturers and electrical 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...