Why Choose the Lovato PMV80NA440 Voltage and Frequency Monitoring Relay?
The Lovato PMV80NA440 is a multifunction three-phase voltage and frequency monitoring relay designed to provide comprehensive protection for electrical systems operating with or without a neutral conductor. As part of the Lovato PMV80N monitoring relay series, it supervises minimum and maximum voltage, minimum and maximum frequency, phase loss, neutral loss and incorrect phase sequence.
This self-powered relay continuously monitors a 380-440 V AC three-phase supply and de-energises its output contacts whenever the measured voltage or frequency moves outside the selected limits, or when a phase-related fault is detected. Adjustable set-points and timing controls allow the protection characteristics to be tailored to motors, generators, machinery, switchboards and industrial automation equipment.
With adjustable 80-95% undervoltage, 105-115% overvoltage and 1-10% frequency deviation thresholds, the PMV80NA440 combines multiple monitoring functions within one compact device. Two changeover outputs provide flexible alarm and shutdown signalling, while neutral-loss detection makes it particularly valuable in installations supplying phase-to-neutral loads.
Key Advantages
- Monitors three-phase 380-440 V AC systems with or without neutral.
- Detects undervoltage and overvoltage conditions.
- Monitors minimum and maximum supply frequency.
- Provides phase loss, neutral loss and incorrect phase sequence protection.
- Self-powered operation eliminates the need for a separate auxiliary supply.
- Adjustable voltage, frequency and tripping-delay settings.
- Two changeover relay outputs support independent shutdown and alarm circuits.
- Automatic reset restores operation once acceptable supply conditions return.
Key Features
- Lovato PMV80N multifunction monitoring relay series.
- 380-440 V AC rated monitoring range.
- Suitable for three-phase systems with or without neutral.
- Minimum and maximum AC voltage monitoring.
- Minimum and maximum frequency monitoring.
- Phase loss, neutral loss and incorrect phase-sequence detection.
- 80-95% adjustable undervoltage threshold.
- 105-115% adjustable overvoltage threshold.
- 1-10% adjustable frequency deviation threshold.
- 0.1-20 second adjustable voltage tripping delay.
- 0.1-5 second adjustable frequency tripping delay.
- Automatic reset with voltage and frequency hysteresis.
- Two normally energised SPDT changeover relay outputs.
- One green LED and three red LEDs for operating and fault indication.
- 35 mm DIN rail mounting with screw terminals.
Reliable Voltage and Frequency Protection
The Lovato PMV80NA440 continuously monitors incoming three-phase voltage and supply frequency, disconnecting the output relay whenever abnormal operating conditions occur. This helps protect motors, generators, drives, control equipment and other critical electrical assets from damage caused by unstable power supplies.
Integrated monitoring for phase loss, neutral loss and incorrect phase sequence provides additional protection for three-phase installations. Adjustable thresholds and configurable timing allow the relay to ignore brief supply disturbances while responding rapidly to genuine electrical faults.
Typical Applications
- Three-phase systems with distributed neutral conductors.
- Generator and mains frequency supervision.
- Industrial motor protection.
- Electrical control panels and switchboards.
- Commercial and industrial distribution systems.
- HVAC and refrigeration equipment.
- Production and packaging machinery.
- Industrial automation and process-control systems.
