Why Choose the Lovato PMV40A600 Voltage Monitoring Relay?
The Lovato PMV40A600 is a compact and dependable three-phase voltage monitoring relay designed to protect industrial electrical systems against voltage asymmetry, phase loss and incorrect phase sequence. As part of the Lovato PMV40 monitoring relay series, it is specifically designed to supervise three-phase systems operating without a neutral conductor.
This self-powered monitoring relay continuously checks a 600 V AC three-phase supply and changes the state of its output relay when a monitored fault is detected. Adjustable asymmetry and timing controls allow the protection settings to be matched to motors, machinery and control systems, helping reduce the risk of overheating, reverse rotation and unexpected equipment failure.
With an adjustable 5–15% voltage asymmetry threshold, phase-loss detection and automatic resetting, the PMV40A600 provides effective protection for high-voltage industrial installations. Its compact two-module enclosure and 35 mm DIN rail mounting enable straightforward installation inside electrical control panels, switchboards and machinery cabinets.
Key Advantages
- Monitors three-phase 600 V AC systems without neutral.
- Detects voltage asymmetry, phase loss and incorrect phase sequence.
- Self-powered operation eliminates the need for a separate auxiliary supply.
- Adjustable 5–15% asymmetry set-point.
- Adjustable tripping and resetting delays help prevent nuisance switching.
- Fast phase-loss detection helps protect motors and connected machinery.
- Changeover output contact supports alarms, contactors and control circuits.
- Compact two-module design for space-efficient panel installation.
Key Features
- Lovato PMV40 voltage monitoring relay series.
- 600 V AC rated control voltage.
- Designed for three-phase systems without neutral.
- Monitoring of voltage asymmetry, phase loss and phase sequence.
- 5–15% adjustable asymmetry threshold.
- 0.1–20 second adjustable tripping delay.
- 0.1–20 second adjustable resetting time.
- Automatic reset after acceptable voltage conditions are restored.
- One SPDT changeover relay output rated up to 8 A.
- Front potentiometers for straightforward setting adjustment.
- Green and red LED status indication.
- 35 mm DIN rail mounting with screw terminals.
Reliable Three-Phase Asymmetry Protection
Voltage asymmetry can cause three-phase motors to draw uneven currents, lose efficiency and generate excessive heat. The Lovato PMV40A600 continuously supervises the relationship between the three phases and operates its output relay when the configured asymmetry limit is exceeded.
The relay also detects complete phase loss and incorrect phase sequence. These functions help protect against motor overheating, reduced torque and reverse rotation, making the PMV40A600 suitable for industrial machinery where dependable 600 V supply supervision is essential.
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 equipment.
- Industrial power distribution systems.
- High-voltage machinery and automation installations.
