Protection Relays
Current Monitoring Relays and Transducers
LSRU SERIES
Load sensor
Description
The LSRU Series is a microcontroller-based family of load
sensors. The LSRU family of products employ three basic
types of control logic: motor control logic, alarm logic and feed
control logic.
Motor Control Logic
Several combinations of functions are available in the LSRU,
including overcurrent and undercurrent or either overcurrent
or undercurrent with variable trip, restart or extended restart
delay settings. These various versions of the LSRU trip on the
respective fault and then automatically reset after the restart
delay expires, in preparation for the next motor start. LSRUs
do not trip on undercurrent when the load turns off, this is
recognized as a normal condition.
Alarm Logic
The LSRU-AL simply indicates whether the current is between
the setpoints or outside of the setpoints. This product is best
used with a PLC or other controller where status indication
is desired.
Feed Control
The LSRU-FC is a load monitor intended to control feeder
mechanisms in a variety of applications. It stops the feeder
when the grinder, chipper, saw, auger, etc. nears overload. When
the load is reduced to a preset level, the feeder is restarted.
Wiring Diagram
Features & Benefits
FEATURES
LED indicator
Built in current sensor
Adjustable current
sensing range
BENEFITS
Visual indication of relay status
Eliminates the need for a stand alone current
transformer and also provides isolation between the
monitored and control circuits
Provides ability to precisely set the current trip point
for any application
Ordering Information
See next page.
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/lsru
Rev: 1-A-062716
Protection Relays
Current Monitoring Relays and Transducers
LSRU SERIES
Ordering Information
MODEL
LINE VOTAGE
CURRENT RANGE
DESCRIPTION
LSRU-024-AL-2
LSRU-024-AL-3
LSRU-115-AL-1.5
LSRU-115-AL-2
LSRU-115-AL-3
LSRU-115-FC-1.5
LSRU-115-OT-1.5
LSRU-115-OT-2
LSRU-115-OT-3
LSRU-115-OR-1.5
LSRU-115-OR-2
LSRU-115-UE-2
LSRU-115-UT-2
LSRU-115-UT-3
LSRU-115-UR-2
LSRU-115-OU-1.5
LSRU-115-OU-2
LSRU-115-OU-3
24VAC
24VAC
115VAC
115VAC
115VAC
115VAC
115VAC
115VAC
115VAC
115VAC
115VAC
115VAC
115VAC
115VAC
115VAC
115VAC
115VAC
115VAC
5-25A
25-100A
0-10A
5-25A
25-100A
0-10A
0-10A
5-25A
25-100A
0-10A
5-25A
5-25A
5-25A
25-100A
5-25A
0-10A
5-25A
25-100A
1.5 = 0-10 Amps
2 = 5-25 Amps
3 = 25-100 Amps
Alarm logic
Alarm logic
Alarm logic
Alarm logic
Alarm logic
Feed control logic
Motor control logic with overcurrent trip, adj trip delay (0.5-60s)
Motor control logic with overcurrent trip, adj trip delay (0.5-60s)
Motor control logic with overcurrent trip, adj trip delay (0.5-60s)
Motor control logic with overcurrent trip, adj restart delay (0.5-300s, manual)
Motor control logic with overcurrent trip, adj restart delay (0.5-300s, manual)
Motor control logic with undercurrent trip, adj ext restart delay (2-300m, manual)
Motor control logic with undercurrent trip, adj trip delay (0.5-60s)
Motor control logic with undercurrent trip, adj trip delay (0.5-60s)
Motor control logic with undercurrent trip, adj restart delay (0.5-300s, manual)
Motor control logic with overcurrent and undercurrent trip
Motor control logic with overcurrent and undercurrent trip
Motor control logic with overcurrent and undercurrent trip
PART # KEY
O = Overcurrent Trip
U = Undercurrent Trip
T = Adj. Trip Delay (0.5-60 seconds)
R = Adj. Restart Delay (0.5-300 seconds, Manual)
E = Adj. Extended Restart Delay (2-300 minutes, Manual)
Specifications
Functional Characteristics
Isolation
Power
Motor Acceleration Time
When not selected as
an option:
Fixed Trip Delay
(-AL, -FC)
Fixed Restart Delay
(-AL only)
(-FC only)
Input Characteristics
Control Power
Output Characteristics
Output Contact Rating (SPDT)
Pilot Duty
General Purpose
600VAC rms
2 Watts
2 seconds
General Characteristics
Temperature Range
Wire Size
Hole Size
Terminal Torque
Safety Marks
CSA, CSA-NRTL/C
CE
Dimensions
Weight
Mounting Method
-40° to 70°C (-40° to 158°F)
#12-24AWG
0.725” diameter
7 in.-lbs.
(File #46510)
H
42.42 mm (1.67”);
W
58.42 mm (2.3”);
D
90.43 mm (3.56”)
0.5 lb. (8 oz., 226.8 g)
Four #6 screws 3/4” in length
0.5 second
1 second
1 second
as soon as current is within limits
0.5 second
24VAC or 115VAC
Caution:
This product should not be relied upon solely for safety of life or safety applications.
480VA @ 240VAC
10A @ 240VAC
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/lsru
Rev: 1-A-062716
PCB Design
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