Lovato PMV10A440 self-powered voltage monitoring relay for three-phase systems without neutral, providing phase loss and incorrect phase sequence detection across 208–480 V AC supplies.
£63.42
The Lovato PMV10A440 is a compact 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 dependable Lovato Electric PMV10 monitoring relay range, it provides straightforward protection for motors, pumps, machinery and industrial control systems.
Designed for a wide monitored voltage range of 208–480 V AC, the PMV10A440 is suitable for many common three-phase industrial supply voltages. The relay is self-powered directly from the monitored circuit, removing the need for a separate auxiliary control supply and simplifying panel wiring.
The PMV10A440 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 relay output changes state so that a contactor, alarm or control system can respond before machinery is operated under unsafe conditions.
Three-phase motors and machinery depend on all supply phases being present and connected in the correct order. A missing phase can cause excessive current, overheating and reduced motor torque, while an incorrect phase sequence can make motors and pumps rotate in the wrong direction.
The Lovato PMV10A440 monitors these conditions continuously. When an unsuitable supply condition is detected, its relay output can interrupt the control circuit, prevent equipment starting or activate a warning signal, helping protect valuable machinery and improve system reliability.
| Voltage | 480 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Lovato Electric |
| Series | PMV10 |
| Model | PMV10A440 |
| Product type | Voltage monitoring relay |
| System type | Three-phase without neutral |
| Monitoring functions | Phase loss and incorrect phase sequence |
| Monitored voltage range | 208–480 V AC |
| Rated frequency | 50/60 Hz |
| Auxiliary supply | Self-powered |
| Number of relay outputs | 1 |
| Reset mode | Automatic |
| Programming | Fixed operation, no adjustment required |
| Status indication | LED |
| Terminal type | Screw terminals |
| Mounting type | DIN rail |
| Modular width | 1 DIN module |
| Front protection rating | IP40 |
| Terminal protection rating | IP20 |
| Weight | Approx. 82 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 PMV10A440 monitors a three-phase AC supply and detects phase loss or incorrect phase sequence before these conditions can affect connected machinery.
The relay is designed for three-phase supplies ranging from 208 to 480 V AC.
No. It is specifically designed for three-phase systems without neutral.
No. The PMV10A440 is self-powered directly from the monitored three-phase circuit.
It detects incorrect phase sequence, allowing the control circuit to prevent a motor from starting with the wrong direction of rotation.
The relay mounts on a standard 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 identify abnormal electrical conditions and improve the protection and reliability of three-phase equipment.
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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...