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.
