OMO ElectronicOMO Electronic
Expand menu
0 Cart

PLR480A

P1-P2
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/
Rev: 1-A-062716
Protection Relays
Voltage Monitoring Relays
www.littelfuse.com/plr
PLR SERIES
Description
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 Series 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.
Field Adjustment: Turn the adjustment knob fully
counterclockwise and apply three-phase power. The LED should
be ON. Increase adjustment until the LED goes OFF. Decrease
adjustment until LED glows again. If nuisance tripping occurs,
decrease the adjustment slightly.
NOTE: When properly adjusted and operating in an average system, a voltage unbalance of 10%
or more is required for phase loss detection. When a phase is lost while the motor is running, a
voltage will be induced into the open phase nearly equal in magnitude to the normal phase-to-
phase voltage. This condition is known as regeneration. When regenerated voltages are present,
the voltage unbalance during single phasing may not exceed 10% for some motors. The PLR
Series may not provide protection under this condition. For systems that require superior phase
loss protection, select the PLMU Series.
Features & Benefits
FEATURES BENEFITS
Continuous monitoring
Prevents 3-phase motor startup when undervoltage
or phase loss condition is present
Industry standard 8-pin
octal plug connection
Eliminates need for special connectors
LED indication
Quick visual indication of output status and correct
phase sequence
Ordering Information
MODEL LINE VOLTAGE
PLR120A 95 to 140VAC
PLR240A 190 to 270VAC
PLR380A 340 to 450VAC
PLR480A 380 to 500VAC
If you don’t find the part you need, call us for a custom product 800-843-8848
Wiring Diagram
F = Fuses
ØA = Phase A = L1
ØB = Phase B = L2
ØC = Phase C = L3
NO = Normally Open
NC = Normally Closed
Relay contacts are isolated
2A fast acting fuses recommended for
safety (not required).
8-PIN
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/
Rev: 1-A-062716
Protection Relays
Voltage Monitoring Relays
www.littelfuse.com/plr
PLR SERIES
Accessories
BZ1 Front Panel Mount Kit
Provides an easy method of through-the-panel
mounting of 8- or 11-pin plug-in timers, flashers,
and other controls.
OT08PC Octal 8-pin Socket
8-pin 35mm DIN rail or surface mount. Rated at
10A @ 600VAC. Surface mounted with two #6
screws or snaps onto a 35 mm DIN rail.
LPSM003ZXID (Indicating),
LPSM003Z (Non-indicating) Fuse Holders
Littelfuse POWR-SAFE Dead Front holders
provide optimum protection to personnel for
Class CC and Midget-Style fuses. 600 VAC/DC
0KLK002.T Midget Fuse (2 Amp)
10 x 38 fast acting, high-interrupting capacity,
current-limiting type fuse. 600 Vac/500 Vdc
C103PM (AL) DIN Rail
35 mm aluminum DIN rail available in a 36 in.
(91.4 cm) length.
Specifications
Line Voltage
Type 3-phase delta or wye with no connection
to neutral
Nominal Voltage Undervoltage
Dropout Adj. Range Line Voltage Max.
120VAC 85 to 130VAC 143VAC
240VAC 170 to 240VAC 270VAC
380VAC 310 to 410VAC 480VAC
480VAC 350 to 480VAC 530VAC
AC Line Frequency 50/60Hz
Phase Sequence ABC
Response Times
Pull-in ≤ 400ms
Drop-out ≤ 100ms
Hysterisis
Pull-in/Drop-out ≅ 2%
Output
Type Electromechanical relay, energized when all
voltages are acceptable
Form SPDT
Rating 5A resistive @ 240VAC, 1/4 Hp @ 120VAC
Maximum Voltage 250VAC
Protection
Phase Reversal/Failure ASME A17.1 Rule 210.6
Motors and Generators NEMA MG1 14:30, 14:35
Surge IEEE C62.41-1991 Level B
Isolation Voltage
120 & 240VAC ≥ 1500V RMS input to output
380 & 480VAC ≥ 2500V RMS input to output
Mechanical
Dimensions H 81.3 mm (3.2”); W 60.7 mm (2.39”);
D 45.2 mm (1.78”)
Mounting* Plug-in socket
Termination Octal 8-pin, plug-in
Environmental
Operating/Storage
Temperature 0° to 55°C / -40° to 85°C
Weight ≅ 6 oz (170 g)
*CAUTION: Select an octal socket rated for 600VAC operation.
P1-P2

PLR480A

Mfr. #:
Buy PLR480A
Manufacturer:
Littelfuse
Description:
Industrial Relays 3PHASELINEMONITOR
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet