PLR Series - Voltage Monitor

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The PLR Series provides a cost effective means of preventing 3-phase motor startup during adverse voltage conditions. Proper A-B-C sequence must occur in order for the PLR’s output contacts to energize. In addition, the relay will not energize when an undervoltage or phase loss condition is present. The PLR protects a motor against undervoltage operation. The adjustment knob sets the undervoltage trip point.


Operation
The output relay is energized and the LED glows when all voltages are acceptable and the phase sequence is correct. Undervoltage must be sensed for a continuous dropout delay period before the relay de-energizes. Reset is automatic upon correction of the fault condition. The output relay will not energize if a fault condition is sensed as power is applied.

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)
Output
Form
Termination TypeMounting MethodDimensionsWeight (lbs/g)Input AC Line Frequency (Hz)Input Phase SequenceInput TypeInput Voltage Maximum (V)Isolation Voltage (V)Output Load Rating (VA)Output TypeMax. Output
Voltage (V)
Pull-in Response Time (ms)StockCompare
PLR120A95 - 140 VacSPDTOctal 8-pin plug-inPlug-in socket rated 600V3.2 H x 2.39 W x 1.78 D in. (81.3 x 60.7 x 45.2 mm)0 Kg50 / 60A; B; C3-phase delta or WYE with no connection to neutral143≥1500 Vrms input to output5 A resistive @ 240 Vac; 1/4 hp @ 120 VacElectromechanical relay energized when all voltages are acceptable250≤400; Hysterisis≅2%Check
PLR240A190 - 270 VacSPDTOctal 8-pin plug-inPlug-in socket rated 600V3.2 H x 2.39 W x 1.78 D in. (81.3 x 60.7 x 45.2 mm)0 Kg50 / 60A; B; C3-phase delta or WYE with no connection to neutral270≥1500 Vrms input to output5 A resistive @ 240 Vac; 1/4 hp @ 120 VacElectromechanical relay energized when all voltages are acceptable250≤400; Hysterisis≅2%Check
PLR380A340 - 450 VacSPDTOctal 8-pin plug-inPlug-in socket rated 600V3.2 H x 2.39 W x 1.78 D in. (81.3 x 60.7 x 45.2 mm)0 Kg50 / 60A; B; C3-phase delta or WYE with no connection to neutral480≥1500 Vrms input to output5 A resistive @ 240 Vac; 1/4 hp @ 120 VacElectromechanical relay energized when all voltages are acceptable250≤400; Hysterisis≅2%Check
PLR480A380 - 500 VacSPDTOctal 8-pin plug-inPlug-in socket rated 600V3.2 H x 2.39 W x 1.78 D in. (81.3 x 60.7 x 45.2 mm)0 Kg50 / 60A; B; C3-phase delta or WYE with no connection to neutral530≥1500 Vrms input to output5 A resistive @ 240 Vac; 1/4 hp @ 120 VacElectromechanical relay energized when all voltages are acceptable250≤400; Hysterisis≅2%Check
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