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.
