Why Choose the Lovato PMV70A575 Voltage Monitoring Relay?
The Lovato PMV70A575 is a multifunction three-phase voltage monitoring relay designed to protect industrial electrical systems against abnormal voltage and phase conditions. As part of the Lovato PMV70 monitoring relay series, it combines undervoltage, overvoltage and voltage-asymmetry monitoring with phase-loss and incorrect phase-sequence detection.
This self-powered relay continuously supervises a 380–575 V AC three-phase supply without neutral and de-energises its output contact when a monitored fault occurs. Adjustable voltage, asymmetry and timing controls allow the protection settings to be matched to motors, machinery and automation systems, helping reduce equipment damage and unplanned downtime.
With adjustable 80–95% undervoltage, 105–115% overvoltage and 5–15% asymmetry thresholds, the PMV70A575 provides several essential monitoring functions within one compact device. Its automatic reset, clear LED indication and 35 mm DIN rail mounting make it well suited to industrial control panels, switchboards and machine-building applications.
Key Advantages
- Monitors three-phase 380–575 V AC systems without neutral.
- Detects undervoltage, overvoltage and voltage asymmetry.
- Provides phase-loss and incorrect phase-sequence protection.
- Self-powered operation eliminates the need for a separate auxiliary supply.
- Independently adjustable voltage and asymmetry thresholds.
- Adjustable tripping and resetting delays help reduce nuisance operation.
- Automatic resetting restores operation after normal conditions return.
- Compact two-module design combines multiple monitoring functions.
Key Features
- Lovato PMV70 multifunction voltage monitoring relay series.
- 380–575 V AC rated monitoring range.
- Designed for three-phase systems without neutral.
- Minimum and maximum AC voltage monitoring.
- Adjustable voltage-asymmetry monitoring.
- Phase-loss and incorrect phase-sequence detection.
- 80–95% adjustable undervoltage threshold.
- 105–115% adjustable overvoltage threshold.
- 5–15% adjustable asymmetry threshold.
- 0.1–20 second adjustable tripping delay.
- 0.1–20 second adjustable resetting time.
- Automatic reset with resetting hysteresis.
- One normally energised SPDT changeover relay output.
- One green LED and three red LEDs for power and fault indication.
- 35 mm DIN rail mounting with screw terminals.
Reliable Multifunction Three-Phase Protection
Undervoltage can cause motors to lose torque and draw excessive current, while overvoltage can place damaging stress on insulation and electronic components. Voltage asymmetry can also produce uneven motor currents, excessive heating and reduced operating efficiency. The Lovato PMV70A575 monitors all three conditions from a single compact relay.
The PMV70A575 also detects phase loss and incorrect phase sequence, helping prevent motor damage, stalled operation and reverse rotation. Adjustable thresholds and time delays allow the relay to distinguish between temporary supply fluctuations and persistent faults, providing dependable protection while reducing unnecessary shutdowns.
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 installations.
- Industrial automation equipment.
- Electrical distribution monitoring systems.
