Why Choose the Lovato PMV55A440 Voltage Monitoring Relay?
The Lovato PMV55A440 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 380–440 V AC single-phase supply and de-energises its output contact when the measured voltage moves outside the configured limits. Independently adjustable minimum and maximum voltage thresholds allow the protection settings to be tailored to motors, control systems, transformers, compressors and other voltage-sensitive equipment.
With adjustable 80–95% undervoltage and 105–115% overvoltage thresholds, configurable trip and reset delays and automatic resetting, the PMV55A440 delivers dependable voltage protection for demanding industrial installations. Its compact two-module enclosure and 35 mm DIN rail mounting allow straightforward installation inside control panels and distribution boards.
Key Advantages
- Monitors single-phase 380–440 V AC electrical systems.
- Detects both undervoltage and overvoltage conditions.
- 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 trip and reset delays reduce nuisance operation.
- Automatic reset restores operation after acceptable voltage conditions return.
- Compact two-module housing for efficient panel installation.
Key Features
- Lovato PMV55 voltage monitoring relay series.
- 380–440 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.
- Automatic reset with 3% resetting hysteresis.
- Instantaneous tripping below 70% of rated voltage.
- One SPDT changeover relay output rated up to 8 A.
- Green and red LED operating and fault indication.
- 35 mm DIN rail mounting with screw terminals.
Reliable Single-Phase Voltage Protection
The Lovato PMV55A440 continuously supervises the incoming single-phase supply and automatically disconnects its output relay when the measured voltage exceeds the configured operating limits. This helps protect motors, transformers, contactors and sensitive electronic equipment from damage caused by unstable mains supplies.
Adjustable thresholds and configurable delay settings allow the relay to distinguish between temporary voltage fluctuations and genuine supply faults, helping reduce unnecessary shutdowns while maintaining reliable equipment protection.
Typical Applications
- Single-phase motor protection.
- Industrial control panels.
- Transformers and auxiliary supplies.
- HVAC and refrigeration equipment.
- Pumps and compressors.
- Commercial distribution boards.
- Production machinery.
- Automation control systems.
