Lovato PMA20240 single-phase AC/DC maximum current monitoring relay with selectable 5 A or 16 A current ranges, adjustable delay and a 24–240 V AC/DC supply.
£232.57
The Lovato PMA20240 is a versatile single-phase current monitoring relay designed to detect maximum AC or DC current conditions in industrial electrical systems. As part of the dependable Lovato Electric PMA monitoring relay range, it provides accurate overcurrent supervision for machinery, control panels and automation equipment.
The relay supports selectable current monitoring ranges up to 5 A or 16 A and operates from a wide 24–240 V AC/DC auxiliary supply. This broad supply range simplifies product selection and allows the PMA20240 to be used across a wide variety of industrial control voltages.
With adjustable current threshold and delay settings, automatic or manual reset functionality and a single changeover relay output, the PMA20240 gives panel builders and engineers flexible control over overcurrent alarms, equipment shutdowns and process interlocks. Its compact DIN rail mounted enclosure delivers reliable monitoring performance in demanding applications where equipment protection is worth its salt.
Current monitoring relays supervise the electrical load drawn by machinery and equipment. When the measured current exceeds the selected threshold for longer than the configured delay, the PMA20240 changes the state of its relay output so that an alarm, contactor, controller or protective circuit can respond.
This adjustable operation helps prevent nuisance trips caused by temporary starting currents while still providing dependable protection against sustained overloads, stalled motors, jammed machinery and abnormal process conditions.
| Voltage | 240 V |
|---|---|
| Phase | Single Phase |
| Manufacturer | Lovato Electric |
| Series | PMA20 |
| Model | PMA20240 |
| Product type | Current monitoring relay |
| Monitoring function | Maximum current / overcurrent |
| System type | Single-phase |
| Measured current type | AC / DC |
| Rated current ranges | 5 A or 16 A |
| Approximate monitored current range | 0.25–16 A |
| Auxiliary supply voltage | 24–240 V AC/DC |
| Operating voltage range | 0.85–1.1 × Us |
| Rated frequency | 50/60 Hz ±5% |
| Maximum power consumption | 3.2 VA |
| Maximum power dissipation | 1.6 W |
| Relay outputs | 1 changeover contact |
| Contact configuration | SPDT |
| Adjustable delay | 0.1–30 seconds |
| Reset mode | Automatic or manual |
| Programming method | Front potentiometers |
| Terminal type | Screw terminals |
| Mounting type | DIN rail |
| Front protection rating | IP40 |
| Terminal protection rating | IP20 |
| Operating temperature | -20°C to +60°C |
| Dimensions (W × H × D) | Approx. 35.8 × 104.7 × 64.9 mm |
| Weight | Approx. 144 g |
| Standards | IEC/EN 60255-5, IEC/EN 61000-6-2, IEC/EN 61000-6-3, UL 508 and CSA C22.2 No. 14 |
| HS Code | 85364900 |
The PMA20240 monitors current in a single-phase AC or DC circuit and changes its relay output when the measured current exceeds the selected maximum threshold.
The relay provides selectable rated current ranges of 5 A or 16 A, allowing it to monitor a broad range of industrial loads.
The PMA20240 operates from a wide 24–240 V AC/DC auxiliary supply, making it suitable for many control panel voltages.
Yes. The off-delay time can be adjusted from approximately 0.1 to 30 seconds to prevent temporary current peaks from causing unwanted operation.
Yes. The relay can be configured for automatic or manual reset, depending on the required control and safety sequence.
The relay mounts on a standard DIN rail inside an electrical control panel and uses screw terminals for the supply, monitored circuit and relay output connections.
Lovato Electric monitoring relays are used by panel builders, machine manufacturers and automation engineers to supervise electrical conditions, protect valuable equipment and improve the reliability of industrial systems.
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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...