The PLR380A is a three-phase voltage monitoring relay designed to prevent motor startup under undervoltage or phase loss conditions and ensure correct phase sequence. It operates on a line voltage range of 340 to 450 VAC, with an undervoltage dropout adjustment range of 310 to 410 VAC and a maximum line voltage of 480 VAC. The relay features an SPDT electromechanical output rated at 5 A resistive at 240 VAC, with an 8-pin octal plug-in package and LED status indication. It meets ASME A17.1 Rule 210.6 and NEMA MG1 14:30, 14:35 standards, and is rated for 250 VAC maximum output voltage. The device is housed in a case measuring 81.3 mm H × 60.7 mm W × 45.2 mm D and mounts via a 35 mm DIN rail or surface socket. Operating temperature ranges from 0° 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, Phase Loss, Phase Sequence 340 ~ 450VAC
| Littelfuse, Inc. | VAST STOCK CO., LIMITED | Quarktwin Technology Ltd. | |
|---|---|---|---|
| Product Category | Electromechanical Relays | Electromechanical Relays | Protective Relays and Monitoring Relays |
| Product Number | PLR380A | PLR380A | PLR380A |
| Product Name | PLR Series – Voltage Monitor | Industrial Relays | Monitor - Relay Output |
| Mounting | Socket or Plug-in Style; Plug-in socket rated 600V |
