PLR Series - Voltage Monitor

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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

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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