Why Choose the Lovato PMV20A575 Voltage Monitoring Relay?
The Lovato PMV20A575 is a dependable three-phase voltage monitoring relay designed to detect phase loss and incorrect phase sequence in electrical systems operating without a neutral conductor. As part of the established Lovato Electric PMV20 monitoring relay series, it provides effective supply supervision for motors, pumps, compressors and industrial machinery.
Designed for a wide monitored voltage range of 208–575 V AC, the PMV20A575 can be used across numerous industrial three-phase supply systems. The relay is self-powered directly from the monitored circuit, eliminating the need for a separate auxiliary supply and simplifying installation within control panels and switchboards.
The PMV20A575 continuously verifies that all three phases are present and connected in the correct sequence. If a phase is lost or the phase order is incorrect, its normally energised relay output changes state rapidly, allowing connected machinery to be stopped or prevented from starting before an unsuitable supply condition causes damage.
Key Advantages
- Reliable phase loss and incorrect phase sequence monitoring.
- Suitable for three-phase systems without neutral.
- Wide 208–575 V AC monitored voltage range.
- Self-powered operation eliminates a separate auxiliary supply.
- Fast response to phase faults helps protect motors and machinery.
- Normally energised output supports fail-safe control circuits.
- Helps prevent incorrect motor rotation and phase-loss damage.
- Compact DIN rail design for industrial control panels.
Key Features
- Lovato Electric PMV20 series.
- Three-phase voltage monitoring relay.
- Phase loss detection.
- Incorrect phase sequence detection.
- 208–575 V AC monitored voltage range.
- 50/60 Hz operating frequency.
- Designed for systems without a neutral connection.
- Self-powered from the monitored three-phase supply.
- 1 relay output.
- Normally energised output operation.
- Automatic reset following restoration of the correct supply.
- Front LED status indication.
- Screw terminal connections.
- Standard DIN rail mounting.
Reliable Phase Monitoring for Three-Phase Equipment
Three-phase motors and industrial equipment depend on all supply phases being present and connected in the correct order. A missing phase can lead to excessive current, overheating, reduced torque and premature motor failure, while an incorrect phase sequence can cause pumps, fans and machinery to rotate in the wrong direction.
The Lovato PMV20A575 continuously monitors the incoming supply and changes the state of its output relay when an unsuitable phase condition is detected. The relay output can interrupt a contactor coil, activate an alarm or communicate the fault to a PLC, helping improve equipment protection and operational reliability.
Typical Applications
- Three-phase motor control circuits.
- Pump and compressor protection.
- Conveyor and material handling systems.
- Industrial machinery and production equipment.
- Heating, ventilation and air-conditioning systems.
- Refrigeration equipment.
- Electrical control panels and switchboards.
- Phase sequence checking before equipment start-up.
- Alarm and safety interlocking circuits.
