Lovato PMV20A600 self-powered three-phase voltage monitoring relay for systems without neutral, providing phase loss and incorrect phase sequence detection across 380–600 V AC supplies.
£155.78
The Lovato PMV20A600 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 monitored voltage range of 380–600 V AC, the PMV20A600 is suitable for higher-voltage three-phase industrial power 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 PMV20A600 continuously checks 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 equipment damage.
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 PMV20A600 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 transmit a fault signal to a PLC, helping improve equipment protection and operational reliability.
| Phase | Three Phase |
|---|---|
| Manufacturer | Lovato Electric |
| Series | PMV20 |
| Model | PMV20A600 |
| Product type | Voltage monitoring relay |
| System type | Three-phase without neutral |
| Monitoring functions | Phase loss and incorrect phase sequence |
| Rated monitored voltage | 380–600 V AC |
| Auxiliary supply | Self-powered |
| Rated frequency | 50/60 Hz |
| Relay outputs | 1 |
| Contact arrangement | SPDT changeover contact |
| Relay operating mode | Normally energised, de-energises on fault |
| Reset mode | Automatic |
| Status indication | Front LED |
| Programming | Fixed operation, no adjustment required |
| Terminal type | Screw terminals |
| Mounting type | 35 mm DIN rail |
| Modular width | 2 DIN modules |
| Protection rating | IP40 front, IP20 terminals |
| Operating temperature | -20°C to +60°C |
| Storage temperature | -30°C to +80°C |
| Dimensions (W × H × D) | Approx. 35.8 × 104.7 × 64.9 mm |
| Weight | Approx. 120 g |
| Compliance | IEC/EN 60255-5, IEC/EN 61000-6-2, IEC/EN 61000-6-3, UL 508, CSA C22.2 No. 14 and IEC/EN 60335-2-89 |
| HS Code | 85364900 |
The PMV20A600 monitors a three-phase AC supply and detects phase loss or incorrect phase sequence before these conditions can affect connected motors and machinery.
The relay is designed for three-phase supplies ranging from 380 to 600 V AC.
No. It is specifically designed for three-phase systems without neutral.
No. The PMV20A600 is self-powered directly from the monitored three-phase circuit.
Yes. It detects incorrect phase sequence, allowing the control circuit to prevent a motor, pump or fan from starting in the wrong direction.
The relay mounts on a standard 35 mm DIN rail inside an electrical control panel and connects to the three monitored phases using screw terminals.
Lovato Electric monitoring relays are used by panel builders, machine manufacturers and automation engineers to detect abnormal electrical conditions and improve the protection and reliability of three-phase equipment.
● Service Agreements
Credit Accounts
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
● frequently asked questions
At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.
We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
● latest blog
LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...