Why Choose the Lovato PMV40A575 Voltage Monitoring Relay?
The Lovato PMV40A575 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 suitable for supervising three-phase systems operating without a neutral conductor.
This self-powered relay continuously monitors a 380–575 V AC three-phase supply and de-energises its output contact when a monitored fault occurs. Adjustable asymmetry and timing controls allow the protection settings to be tailored to motors, machinery and control systems, helping reduce the risk of overheating, incorrect rotation and unexpected equipment failure.
With an adjustable 5–15% asymmetry threshold, rapid phase-loss detection and automatic reset, the PMV40A575 offers practical protection for higher-voltage industrial installations. Its compact two-module enclosure and 35 mm DIN rail mounting support straightforward installation inside electrical control panels and switchboards.
Key Advantages
- Monitors three-phase 380–575 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 operation.
- Fast phase-loss response helps protect motors and connected equipment.
- Compact two-module design for space-efficient panel installation.
Key Features
- Lovato PMV40 voltage monitoring relay series.
- 380–575 V AC rated monitoring range.
- 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 following restoration of acceptable supply conditions.
- One SPDT changeover relay output rated up to 8 A.
- Potentiometer-based adjustment for straightforward configuration.
- Green and red LED operating and trip 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, operate inefficiently and generate excessive heat. The Lovato PMV40A575 continuously compares the monitored phases and operates its output relay when the configured asymmetry level is exceeded.
The relay also detects complete phase loss and incorrect phase sequence. These functions help prevent motor damage, loss of torque and reverse rotation, making the PMV40A575 well suited to industrial machinery and motor control applications where dependable higher-voltage 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.
