Why Choose the Lovato PMV50A600 Voltage Monitoring Relay?
The Lovato PMV50A600 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 monitoring relay continuously supervises a 600 V AC three-phase supply and de-energises its output relay when the voltage moves outside the configured limits or a phase-related fault occurs. Independently adjustable minimum and maximum voltage thresholds allow the protection settings to be tailored to motors, machinery and control systems.
With adjustable 80–95% undervoltage and 105–115% overvoltage thresholds, an adjustable intervention delay and automatic reset, the PMV50A600 helps reduce the risk of motor overheating, insulation damage, incorrect rotation and unexpected downtime. Its compact two-module enclosure and 35 mm DIN rail mounting make it suitable for installation in industrial control panels, machinery cabinets and switchboards.
Key Advantages
- Monitors three-phase 600 V AC systems without neutral.
- Detects undervoltage, overvoltage, phase loss and incorrect phase sequence.
- Self-powered design 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 delay helps prevent nuisance operation during temporary disturbances.
- Changeover relay output supports contactors, alarms and automation circuits.
- Compact two-module construction saves valuable control-panel space.
Key Features
- Lovato PMV50 voltage monitoring relay series.
- 600 V AC rated control voltage.
- Designed for three-phase systems without neutral.
- Minimum and maximum AC voltage monitoring.
- Integrated phase-loss and incorrect phase-sequence detection.
- 80–95% adjustable undervoltage threshold.
- 105–115% adjustable overvoltage threshold.
- 0.1–20 second adjustable tripping delay.
- Automatic reset after acceptable supply conditions are restored.
- Normally energised output relay that de-energises when a fault occurs.
- One SPDT changeover contact rated up to 8 A.
- Front-mounted potentiometers for simple configuration.
- Green and red LED operating and fault indication.
- 35 mm DIN rail mounting with screw terminals.
Reliable Minimum and Maximum Voltage Protection
Undervoltage can cause three-phase motors to lose torque, draw excessive current and overheat, while overvoltage can place damaging stress on insulation and connected electrical equipment. The Lovato PMV50A600 continuously supervises the supply and changes the state of its output relay when the measured voltage moves outside the selected operating limits.
The relay also detects phase loss and incorrect phase sequence, helping prevent motor damage, reduced performance and reverse rotation. Its adjustable thresholds and timing control allow the protection characteristics to be matched to the connected machinery while reducing unnecessary trips caused by short-lived voltage fluctuations.
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 installations.
- 600 V AC electrical distribution systems.
