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US Patent No. 6541954
ANSI Device # 27/32
Protects Against: Phase
Loss (On Startup), Phase
Reversal, Undervoltage
Used Where Moderate
Voltage Unbalance
Protection is Not Required
Direct Replacement for
Most Popular 3 Phase
Monitors
8 Pin Octal Base
Connection
SPDT Isolated 5 A Relay
Contacts
AMSE A17.1 rule 210.6
NEMA MG1 14:30, 14:35
IEEE C62.41-1991 Level B
Approvals:
Accessories
Panel mount kit
P/N: BZ1
Octal
8-pin socket
P/N: OT08PC
3-phase fuse
block/disconnect
P/N: P0700-241
2 AMP fuse
P/N: P0600-11
DIN rail P/Ns:
017322005 (Steel)
C103PM (Al)
See accessory pages for
specifications.
7.18
1TRC 001 009 C0202
3 Phase Voltage Monitor
PLR Series
Motor Protector
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 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.
Connection
Relay contacts are isolated. Dashed lines are
internal connections.
Ordering Table
Voltage
95 ... 140 V AC
190 ... 270 V AC
340 ... 450 V AC
380 ... 500 V AC
Field Adjustment:
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.
2 Amp
Fast Acting
Fuses
Recommended
For Safety
(Not Required)
F = Fuses
ØA = Phase A = L1
ØB = Phase B = L2
ØC = Phase C = L3
NO = Normally Open
NC = Normally Closed
Part Number
PLR120A
PLR240A
PLR380A
PLR480A
ABB Inc. • 888-385-1221 • Technical assistance 800-377-7722 • www.ssac.com
Turn the adjustment knob fully
Low Voltage Products & Systems
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