PLPU - 

Macromatic’s PLP Series Three-Phase Monitor Relays continuously monitor all voltages of a three-phase system. They are used to protect motors and equipment from expensive damage due to phase loss and phase reversal. These products detect single phasing regardless of regenerative voltages.
The PLP Series incorporates a microprocessor-based design capable of advanced signal processing including True RMS voltage measurement. Innovative analog-to-digital sensing circuitry allows for true full-wave monitoring of all three phases, delivering the highest level of protection possible.
True RMS voltage measurement ensures accurate sensing in most generator and other applications with non-sinusoidal wave forms, eliminating nuisance tripping. Full wave monitoring provides a more accurate method to measure the voltages, regardless of load type or wave shape, resulting in improved protection across more applications.
Unlike similar three-phase monitor relays, these products will continue to function even with a lost phase. They are the only line-powered units in their class to retain fault indication and continuous monitoring of all voltages during a phase loss, increasing the ease of troubleshooting and the level of protection.

Protects against phase loss & phase reversal

Universal voltage range of 190-500 V – greater range that covers more global applications

True RMS voltage measurement ensures accurate sensing across more applications

Retains fault indication and continues monitoring even with lost phase

Full fault indication on top of unit for easy troubleshooting

Compact plug-in case utilizing industry-standard 8 pin octal socket

10A SPDT output contact

Pilot Duty Rating


Specifications

SPDT 10A @ 277VAC / 7A @ 30VDC

Temperature: –28°C to 65°C

Dimensions: 3.0" D × 1.7" W × 2.4" H


Operation:
When the proper three-phase line voltage is applied to the unit and the phase sequence (rotation) is correct, the relay is energized. A phase loss or phase reversal condition will de-energize the relay after a delay. Re-energization is automatic upon correction of the fault condition. A bi-color status LED indicates normal condition and also provides specific fault indication to simplify troubleshooting.