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PMV50A240 – 3PH SYSTEM MULTIFUNCTION PRO- TECTION RE
Lovato PMV50A240 self-powered three-phase voltage monitoring relay for 208–240 V AC systems without neutral, providing minimum-voltage, maximum-voltage, phase-loss and incorrect phase-sequence protection.
£179.30
Why Choose the Lovato PMV50A240 Voltage Monitoring Relay?
The Lovato PMV50A240 is a compact and reliable three-phase voltage monitoring relay designed to protect industrial electrical systems against undervoltage, overvoltage, phase loss and incorrect phase sequence. As part of the Lovato PMV50 monitoring relay series, it provides comprehensive supply supervision for 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 voltage or phase fault is detected. Independently adjustable minimum and maximum voltage thresholds allow the protection settings to be matched to the requirements of motors, machinery and control systems.
With adjustable 80–95% undervoltage and 105–115% overvoltage thresholds, configurable timing controls and rapid phase-loss detection, the PMV50A240 helps reduce the risk of motor overheating, insulation damage, incorrect rotation and unexpected downtime. Its two-module enclosure and 35 mm DIN rail mounting make it straightforward to install in industrial control panels and switchboards.
Key Advantages
- Monitors three-phase 208–240 V AC systems without neutral.
- Detects undervoltage, overvoltage, phase loss and incorrect phase sequence.
- Self-powered operation eliminates the need for a separate auxiliary supply.
- Adjustable minimum-voltage threshold from 80% to 95% of Ue.
- Adjustable maximum-voltage threshold from 105% to 115% of Ue.
- Adjustable tripping and resetting delays help prevent nuisance operation.
- Fast phase-loss response helps protect motors and connected machinery.
- Compact two-module design for space-efficient panel installation.
Key Features
- Lovato PMV50 voltage monitoring relay series.
- 208–240 V AC rated control voltage.
- Designed for three-phase systems without neutral.
- Minimum and maximum AC voltage monitoring.
- Phase-loss and incorrect phase-sequence detection.
- 80–95% adjustable undervoltage threshold.
- 105–115% adjustable overvoltage threshold.
- 0.1–20 second adjustable tripping delay.
- 0.1–20 second adjustable resetting time.
- Instantaneous tripping when voltage falls below 70% of Ue.
- Automatic reset with 3% resetting hysteresis.
- One SPDT changeover relay output rated up to 8 A.
- Front potentiometers for straightforward adjustment.
- One green LED and two red LEDs for status and trip indication.
Reliable Minimum and Maximum Voltage Protection
Undervoltage can cause motors to draw excessive current, lose torque and overheat, while overvoltage can place unnecessary stress on insulation and connected electrical components. The Lovato PMV50A240 continuously supervises the supply voltage and changes the state of its output relay when the measured value moves outside the configured limits.
The relay also detects phase loss and incorrect phase sequence, helping prevent motor damage and reverse rotation. Its adjustable thresholds and timing controls allow protection to be tailored to the connected equipment while reducing nuisance trips caused by brief supply disturbances.
Typical Applications
- Three-phase motor protection circuits.
- Industrial control panels and switchboards.
- Pumps, fans and compressors.
- Conveyors and material handling systems.
- Production and packaging machinery.
- HVAC and refrigeration equipment.
- Industrial automation systems.
- Electrical power distribution monitoring.
Technical Specifications
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| Reset Type | Automatic | |
|---|---|---|
| Monitored Supply | Three-phase | |
| Time Delay | Adjustable | |
| Monitoring Function | Three-phase supply | |
| Phase | Three Phase | |
| Manufacturer | Lovato Electric | |
| Series | PMV50 | |
| Model | PMV50A240 | |
| 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 | |
| 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 | |
| Power-up resetting time | 0.5 seconds | |
| Resetting hysteresis | 3% | |
| Instantaneous tripping 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 | |
| Rated operational contact voltage | 250 V AC | |
| Maximum switching voltage | 400 V AC | |
| Conventional free-air thermal current | 8 A | |
| Contact rating | B300 | |
| Electrical life | 100,000 cycles at rated load | |
| Mechanical life | 30,000,000 cycles | |
| Status indication | 1 green LED and 2 red LEDs | |
| Programming method | Potentiometers | |
| 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 | 2 modules | |
| Dimensions (W × H × D) | 35.8 × 104.7 × 64.9 mm | |
| Weight | approximately 130 g | |
| HS Code | 85364900 |
Frequently Asked Questions
What is the Lovato PMV50A240 used for?
The PMV50A240 monitors a three-phase 208–240 V AC supply for undervoltage, overvoltage, phase loss and incorrect phase sequence, helping protect motors and industrial equipment.
Does the PMV50A240 require a separate auxiliary supply?
No. The relay is self-powered directly from the monitored three-phase circuit.
Can the minimum and maximum voltage limits be adjusted?
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.
How quickly does the relay respond to phase loss?
The PMV50A240 has a phase-loss tripping time of approximately 60 milliseconds.
How is the Lovato PMV50A240 installed?
The relay mounts onto a standard 35 mm DIN rail and occupies two modular units inside an electrical control panel or switchboard.
Trusted Industrial Voltage Monitoring
Lovato monitoring relays are widely used by panel builders, machine manufacturers and maintenance engineers to provide dependable voltage and phase protection in industrial electrical systems.
