Why Choose the Lovato PMV30A575 Voltage Monitoring Relay?
The Lovato PMV30A575 is a dependable three-phase voltage monitoring relay designed to detect minimum voltage, phase loss and incorrect phase sequence in electrical systems operating without a neutral conductor. As part of the established Lovato Electric PMV30 monitoring relay series, it provides reliable supply supervision for motors, pumps, compressors and industrial machinery.
Designed for 380–575 V AC three-phase systems, the PMV30A575 is self-powered directly from the monitored circuit. Its adjustable minimum voltage threshold allows the protection level to be configured around the requirements of the connected equipment, helping prevent unreliable operation and damage caused by undervoltage.
Adjustable tripping and resetting delays help avoid nuisance operation during brief voltage fluctuations, while rapid phase-loss detection provides effective protection against serious supply faults. With automatic reset, clear LED indication and a normally energised changeover output, the PMV30A575 is a monitoring relay worth its salt for demanding industrial control panels.
Key Advantages
- Monitors minimum AC voltage, phase loss and incorrect phase sequence.
- Designed for three-phase systems without neutral.
- Suitable for 380–575 V AC supplies.
- Adjustable undervoltage threshold for application-specific protection.
- Adjustable tripping and resetting delays reduce nuisance operation.
- Rapid response to phase loss helps protect motors and machinery.
- Self-powered operation eliminates a separate auxiliary supply.
- Normally energised relay output supports fail-safe control circuits.
Key Features
- Lovato Electric PMV30 series.
- Three-phase voltage monitoring relay.
- Minimum AC voltage monitoring.
- Phase loss detection.
- Incorrect phase sequence detection.
- 380–575 V AC monitored voltage range.
- 50/60 Hz operating frequency.
- Adjustable minimum voltage set-point.
- Adjustable tripping and resetting delays.
- Automatic reset following restoration of the correct supply.
- 1 SPDT changeover relay output.
- Green and red LED status indication.
- Front potentiometer adjustment.
- Screw terminal connections.
- 35 mm DIN rail mounting.
Reliable Voltage and Phase Monitoring for Three-Phase Equipment
Low supply voltage can reduce motor torque, increase current consumption and cause unreliable operation of industrial machinery. Phase loss may lead to overheating and premature motor failure, while an incorrect phase sequence can cause pumps, fans and other rotating equipment to operate in the wrong direction.
The Lovato PMV30A575 continuously monitors the three-phase supply and compares the measured voltage with the selected minimum threshold. If an abnormal condition remains present beyond the configured delay, the normally energised relay output de-energises so machinery can be stopped, inhibited from starting or connected to an alarm system.
Typical Applications
- Three-phase motor protection circuits.
- Pump and compressor control systems.
- Conveyors and material handling equipment.
- Industrial machinery and production lines.
- Heating, ventilation and air-conditioning systems.
- Refrigeration equipment.
- Electrical distribution and control panels.
- Phase sequence verification before equipment start-up.
- Alarm and safety interlocking circuits.
