The PLR240A is a voltage monitoring relay that prevents 3-phase motor startup under undervoltage or phase loss conditions, requiring correct A-B-C sequence. It features an 8-pin plug-in octal package with dimensions of 81.3 mm × 60.7 mm × 45.2 mm and operates on 190-270 VAC. The undervoltage trip is adjustable from 170-240 VAC. An LED indicates output status; the electromechanical SPDT relay is rated at 5 A resistive at 240 VAC. Reset is automatic after fault correction. It meets ASME A17.1 Rule 210.6 and NEMA MG1 14:30, 14:35, with 1500 V RMS isolation and operating temperatures of 0°C to 55°C.
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. OperationThe 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.
Industrial Relays 3PHASELINEMONITOR
Voltage Sensing AC 190 ~ 270VAC
| Littelfuse, Inc. | VAST STOCK CO., LIMITED | Quarktwin Technology Ltd. | |
|---|---|---|---|
| Product Category | Electromechanical Relays | Electromechanical Relays | Protective Relays and Monitoring Relays |
| Product Number | PLR240A | PLR240A | PLR240A |
| Product Name | PLR Series – Voltage Monitor | Industrial Relays | Monitor - Relay Output |
| Mounting | Socket or Plug-in Style; Plug-in socket rated 600V |
