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PMV55A240 – 1 PHASE LINE VOLTAGE CONTROL RELAY PMV55
Lovato PMV55A240 self-powered single-phase voltage monitoring relay for 208–240 V AC systems, providing adjustable undervoltage and overvoltage protection.
£139.04
Why Choose the Lovato PMV55A240 Voltage Monitoring Relay?
The Lovato PMV55A240 is a compact and dependable single-phase voltage monitoring relay designed to protect electrical equipment against undervoltage and overvoltage conditions. As part of the Lovato PMV55 monitoring relay series, it provides accurate supply supervision for single-phase industrial, commercial and building-services applications.
This self-powered relay continuously monitors a 208–240 V AC single-phase supply and de-energises its output contact when the measured voltage moves outside the selected limits. Independently adjustable minimum and maximum voltage thresholds allow the protection settings to be matched to machinery, control systems, compressors, pumps and other voltage-sensitive equipment.
With adjustable 80–95% undervoltage and 105–115% overvoltage thresholds, configurable trip and reset delays and automatic resetting, the PMV55A240 offers flexible protection against unstable supplies. Its compact two-module housing and 35 mm DIN rail mounting make installation straightforward inside electrical control panels, distribution boards and machinery cabinets.
Key Advantages
- Monitors single-phase 208–240 V AC electrical systems.
- Detects both undervoltage and overvoltage conditions.
- Self-powered design removes 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 trip and reset delays help reduce nuisance switching.
- Automatic reset restores operation after acceptable voltage conditions return.
- Compact two-module construction saves control-panel space.
Key Features
- Lovato PMV55 voltage monitoring relay series.
- 208–240 V AC rated monitoring range.
- Designed for single-phase electrical systems.
- Minimum and maximum AC voltage monitoring.
- 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 normally energised SPDT changeover relay output.
- 8 A conventional thermal contact rating.
- Front potentiometers for straightforward adjustment.
- One green LED and two red LEDs for status and trip indication.
- 35 mm DIN rail mounting with screw terminals.
Reliable Single-Phase Voltage Protection
Undervoltage can prevent motors, contactors and control equipment from operating correctly, while overvoltage can place damaging stress on insulation and electronic components. The Lovato PMV55A240 continuously supervises the connected supply and changes the state of its output relay when the voltage moves outside the configured operating window.
The adjustable thresholds and timing controls allow the relay to distinguish between brief supply fluctuations and persistent faults. This helps protect connected equipment while reducing unnecessary shutdowns caused by short-lived voltage disturbances.
Typical Applications
- Single-phase motor and pump protection.
- Industrial control panels and distribution boards.
- Compressors and refrigeration equipment.
- HVAC and building-services installations.
- Packaging and production machinery.
- Control transformers and auxiliary circuits.
- Commercial electrical installations.
- Voltage-sensitive automation equipment.
Technical Specifications
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| Reset Type | Automatic | |
|---|---|---|
| Monitoring Function | Voltage | |
| Monitored Supply | Single-phase | |
| Time Delay | Adjustable | |
| Phase | Single Phase | |
| Manufacturer | Lovato Electric | |
| Series | PMV55 | |
| Model | PMV55A240 | |
| Product type | Single-phase voltage monitoring relay | |
| Monitored system | Single-phase | |
| 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 | 10 VA | |
| Maximum power dissipation | 1.5 W | |
| Monitoring functions | Minimum and maximum AC voltage | |
| 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 | |
| Repeat accuracy | Better than ±0.1% | |
| Reset type | Automatic | |
| Programming method | 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 | |
| Contact designation | B300 | |
| Electrical life | 100,000 cycles at rated load | |
| Mechanical life | 30,000,000 cycles | |
| Status indication | 1 green LED and 2 red LEDs | |
| Terminal type | Screw terminals | |
| Maximum terminal tightening torque | 0.8 N·m | |
| Conductor size | 0.2–4 mm² | |
| Rated insulation voltage | 440 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 125 g | |
| 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 |
Frequently Asked Questions
What is the Lovato PMV55A240 used for?
The PMV55A240 monitors a single-phase 208–240 V AC supply for undervoltage and overvoltage, helping protect motors, machinery and electrical control equipment.
Does the PMV55A240 require a separate auxiliary supply?
No. The relay is self-powered directly from the monitored single-phase electrical supply.
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.
What happens when the monitored voltage moves outside the set limits?
The normally energised output relay de-energises after the selected trip delay, allowing connected contactors, alarms or control circuits to respond to the fault.
Does the PMV55A240 reset automatically?
Yes. The relay automatically resets after the voltage returns to an acceptable level and the selected resetting time has elapsed.
How is the Lovato PMV55A240 installed?
The relay mounts onto a standard 35 mm DIN rail and occupies two modular units inside an electrical control panel or distribution board.
Trusted Industrial Voltage Monitoring
Lovato monitoring relays are widely used by panel builders, machine manufacturers and electrical engineers to provide dependable voltage supervision and equipment protection in industrial and commercial electrical systems.
