Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
PMA50A415 – PUMP PROTECTION RELAY 380-415VAC
Lovato PMA50A415 pump protection relay for single-phase and three-phase systems, providing maximum AC current, minimum power factor, phase loss and incorrect phase sequence monitoring with a 380–415 V AC supply.
£178.54
Why Choose the Lovato PMA50A415 Pump Protection Relay?
The Lovato PMA50A415 is a multifunction pump protection relay designed to monitor and protect single-phase and three-phase pump motors against abnormal operating conditions. As part of the dependable Lovato Electric PMA50 monitoring relay series, it combines maximum AC current monitoring with minimum power factor supervision to identify overloads, underload conditions and dry-running pumps.
Designed for systems operating from a 380–415 V AC auxiliary supply, the PMA50A415 provides selectable 5 A or 16 A current measurement ranges. Higher motor currents can be monitored through a suitable current transformer, allowing the relay to protect a wide range of pump sizes and industrial pumping installations.
The PMA50A415 also monitors phase loss and incorrect phase sequence in three-phase systems. Adjustable current, power factor and timing controls allow the relay to be configured around the operating characteristics of the connected pump, providing effective motor protection and helping prevent costly equipment damage when dependable operation is worth its salt.
Key Advantages
- Dedicated pump protection relay for single-phase and three-phase systems.
- Detects maximum AC current to protect against sustained overload conditions.
- Monitors minimum power factor to detect dry running and underload.
- Provides phase loss and incorrect phase sequence protection.
- Selectable 5 A or 16 A current ranges.
- Suitable for direct current measurement or connection through a current transformer.
- Adjustable thresholds and timing functions for application-specific protection.
- Compact DIN rail format for pump control panels.
Key Features
- Lovato Electric PMA50 series.
- Maximum AC current monitoring.
- Minimum cosφ monitoring for dry-running protection.
- Phase loss detection.
- Incorrect phase sequence detection.
- 5 A or 16 A selectable current measurement range.
- 380–415 V AC auxiliary supply.
- Adjustable maximum current threshold.
- Adjustable minimum power factor threshold.
- Adjustable start-up inhibition and trip delay.
- Manual or automatic reset operation.
- 1 changeover relay output.
- LED indication for supply, inhibition and trip conditions.
- Screw terminal connections.
- DIN rail mounting.
Comprehensive Protection for Pump Motors
A pump motor can continue drawing electrical current even when the pump is running without sufficient fluid. The Lovato PMA50A415 monitors both motor current and power factor, allowing it to identify dry running, loss of prime, blocked pumps and sustained overload conditions that may not be detected by conventional overcurrent protection alone.
When an abnormal condition remains present beyond the selected delay, the relay changes the state of its output contact. This can stop the pump, activate an alarm or send a fault signal to a PLC or control system, helping prevent overheating, seal damage and premature motor or pump failure.
Typical Applications
- Borehole and submersible pumps.
- Water supply and booster pump systems.
- Irrigation and agricultural pumping equipment.
- Wastewater and drainage pumps.
- Industrial process pumps.
- Cooling water and circulation systems.
- Three-phase pump control panels.
- Motor underload and overload protection systems.
Technical Specifications
Tick the specs you need, then view products that match.
| Reset Type | Manual or automatic | |
|---|---|---|
| Monitoring Function | Power / cos φ | |
| Monitored Supply | Three-phase | |
| Voltage | 415 V | |
| Phase | Single Phase | |
| Manufacturer | Lovato Electric | |
| Series | PMA50 | |
| Model | PMA50A415 | |
| Product type | Pump protection relay | |
| System type | Single-phase and three-phase | |
| Measured current type | AC | |
| Monitoring functions | Maximum current, minimum cosφ, phase loss and incorrect phase sequence | |
| Auxiliary supply voltage | 380–415 V AC | |
| Operating voltage range | 0.85–1.1 × Us | |
| Rated frequency | 50 / 60 Hz ±5% | |
| Maximum power consumption | 4.5 VA | |
| Selectable current ranges | 5 A or 16 A | |
| Maximum current threshold adjustment | 5–100% of selected range | |
| Minimum power factor adjustment | 0.10–0.99 cosφ | |
| Measurement connection | Direct or via current transformer | |
| Reset mode | Manual or automatic | |
| Relay outputs | 1 changeover contact | |
| Contact configuration | SPDT | |
| Conventional thermal current | 8 A | |
| Output operating mode | Normally energised, de-energises on trip | |
| Status indication | Green supply/inhibition LED and red trip LEDs | |
| Terminal type | Screw terminals | |
| Mounting type | DIN rail | |
| Modular width | 3 modules | |
| Front protection rating | IP40 | |
| Terminal protection rating | IP20 | |
| Operating temperature | -20°C to +60°C | |
| Dimensions (W × H × D) | Approx. 53.5 × 104.7 × 64.9 mm | |
| Compliance | 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 |
Frequently Asked Questions
What is the Lovato PMA50A415 used for?
The PMA50A415 protects single-phase and three-phase pump motors against overcurrent, dry running, phase loss and incorrect phase sequence.
How does the PMA50A415 detect dry running?
It monitors the motor power factor and trips when the measured cosφ falls below the selected minimum threshold, indicating that the pump may be operating without sufficient fluid or mechanical load.
What current ranges can the PMA50A415 monitor?
The relay provides selectable 5 A and 16 A ranges. Higher motor currents can be monitored using a suitable current transformer.
What supply voltage does the PMA50A415 require?
The relay operates from a 380–415 V AC auxiliary supply at 50 or 60 Hz.
Does the relay protect against phase faults?
Yes. In three-phase applications, the PMA50A415 detects phase loss and incorrect phase sequence, helping prevent motor damage and incorrect pump rotation.
Can the PMA50A415 be manually reset?
Yes. The relay supports manual or automatic reset operation, allowing the required restart sequence to be selected for the application.
Trusted Pump Protection for Industrial Systems
Lovato Electric monitoring relays are used by panel builders, pump installers and automation engineers to protect motors, detect abnormal operating conditions and improve the reliability of industrial pumping systems.
