Lovato PMV40A240 self-powered three-phase voltage monitoring relay for 208–240 V AC systems without neutral, providing voltage asymmetry, phase-loss and incorrect phase-sequence protection.
£226.10
The Lovato PMV40A240 is a compact and dependable three-phase voltage monitoring relay designed to protect industrial electrical systems against voltage asymmetry, phase loss and incorrect phase sequence. As part of the Lovato PMV40 monitoring relay series, it is suitable for supervising three-phase systems operating without a neutral conductor.
This self-powered relay continuously monitors a 208–240 V AC three-phase supply and de-energises its output contact when a monitored fault occurs. Adjustable asymmetry and timing controls allow the protection settings to be tailored to motors, machinery and control systems, helping reduce the risk of overheating, incorrect rotation and unexpected equipment failure.
With an adjustable 5–15% asymmetry threshold, rapid phase-loss detection and automatic reset, the PMV40A240 offers practical protection for industrial installations. Its compact two-module enclosure and 35 mm DIN rail mounting support straightforward installation inside electrical control panels and switchboards.
Voltage asymmetry can cause three-phase motors to draw uneven currents, operate inefficiently and generate excessive heat. The Lovato PMV40A240 continuously compares the monitored phases and operates its output relay when the configured asymmetry level is exceeded.
The relay also detects complete phase loss and incorrect phase sequence. These functions help prevent motor damage, loss of torque and reverse rotation, making the PMV40A240 well suited to industrial machinery and motor control applications where dependable supply supervision is essential.
| Voltage | 240 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Lovato Electric |
| Series | PMV40 |
| Model | PMV40A240 |
| Product type | 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 ±5% |
| Auxiliary supply | Self-powered |
| Maximum power consumption | 11 VA |
| Maximum power dissipation | 2.5 W |
| Monitored conditions | Voltage asymmetry, phase loss and incorrect phase sequence |
| Asymmetry set-point | 5–15% of Ue |
| Tripping delay | 0.1–20 seconds |
| Resetting time | 0.1–20 seconds |
| Power-up resetting time | 0.5 seconds |
| Resetting hysteresis | 3% |
| Instantaneous trip threshold | Below 70% of Ue |
| Phase-loss tripping time | 60 ms |
| Repeat accuracy | Better than ±0.1% |
| Reset type | Automatic |
| Relay outputs | 1 |
| Relay operating state | Normally energised, de-energises on trip |
| Contact arrangement | 1 changeover SPDT |
| Contact thermal current | 8 A |
| Rated contact voltage | 250 V AC |
| Maximum switching voltage | 400 V AC |
| Electrical life | 100,000 cycles at rated load |
| Mechanical life | 30,000,000 cycles |
| 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 |
| Housing material | Self-extinguishing polyamide |
| Protection rating | IP40 front, IP20 terminals |
| Mounting type | 35 mm DIN rail |
| Modular width | 2 modules |
| Dimensions (W × H × D) | 35.8 × 104.7 × 64.9 mm |
| Weight | approximately 130 g |
| HS Code | 85364900 |
The PMV40A240 monitors a three-phase 208–240 V AC supply for voltage asymmetry, phase loss and incorrect phase sequence, helping protect motors and industrial equipment.
No. The relay is self-powered directly from the monitored three-phase circuit.
Yes. The asymmetry set-point can be adjusted between 5% and 15% of the rated voltage.
The PMV40A240 has a phase-loss tripping time of approximately 60 milliseconds.
The relay mounts onto a standard 35 mm DIN rail and occupies two modular units inside an electrical control panel.
Lovato monitoring relays are widely used by control 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...