Why Choose the Lovato PMV70NA600 Voltage Monitoring Relay?
The Lovato PMV70NA600 is a multifunction three-phase voltage monitoring relay designed to provide comprehensive protection for electrical systems operating with or without a neutral conductor. As part of the Lovato PMV70N monitoring relay series, it combines minimum-voltage, maximum-voltage and voltage-asymmetry monitoring with phase-loss, neutral-loss and incorrect phase-sequence detection.
This self-powered relay continuously supervises a 480–600 V AC three-phase supply and de-energises its output contacts whenever an abnormal voltage or phase condition is detected. Adjustable voltage, asymmetry and timing controls allow the protection settings to be tailored to motors, machinery, switchboards and industrial automation systems.
With adjustable 80–95% undervoltage, 105–115% overvoltage and 5–15% voltage asymmetry thresholds, the PMV70NA600 combines multiple protection functions in one compact relay. Two changeover outputs provide flexible alarm and shutdown signalling, while neutral-loss monitoring makes it particularly suitable for installations supplying phase-to-neutral loads.
Key Advantages
- Monitors three-phase 480–600 V AC systems with or without neutral.
- Detects undervoltage, overvoltage and voltage asymmetry.
- Provides phase-loss, neutral-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 delay helps reduce nuisance operation.
- Two changeover relay outputs support separate shutdown, control and alarm circuits.
- Automatic resetting restores operation once normal supply conditions return.
Key Features
- Lovato PMV70N multifunction voltage monitoring relay series.
- 480–600 V AC rated monitoring range.
- Suitable for three-phase systems with or without neutral.
- Minimum and maximum AC voltage monitoring.
- Voltage asymmetry monitoring.
- Phase-loss, neutral-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.
- 0.5 second automatic resetting time.
- Automatic reset with 3% resetting 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 Three-Phase and Neutral Protection
The Lovato PMV70NA600 continuously supervises the incoming electrical supply and responds whenever undervoltage, overvoltage, voltage asymmetry, phase loss, neutral loss or incorrect phase sequence is detected. By disconnecting the control circuit before damage develops, it helps extend the service life of motors, drives and industrial equipment.
The adjustable thresholds and configurable timing functions enable the relay to distinguish between temporary supply disturbances and genuine electrical faults, improving system reliability while reducing unnecessary production interruptions.
Typical Applications
- Three-phase systems with distributed neutral conductors.
- Industrial motor protection circuits.
- Electrical control panels and switchboards.
- Commercial and industrial distribution boards.
- Pumps, fans and compressors.
- Packaging and production machinery.
- HVAC and refrigeration systems.
- Industrial automation and process control.
