© 2016 Littelfuse Protection Relays & Controls
Protection Relays
Current Monitoring Relays and Transducers
www.littelfuse.com/lsrx-lsrxc
Rev: 1-A-062716
LSRX / LSRX-C SERIES
Self-powered load sensor, low-cost
proof relay
Wiring Diagram
Description
The LSRX/LSRX-C Series are AC current sensors designed to
energize the output contact whenever 4.5 Amps or greater is
present. The LSRX/LSRX-C Series is used commonly as an AC
current proof relay to indicate if a motor is operating. It can also
be used to interlock fans, compressors and motors; to indicate
equipment status such as feed rates, tool wear, loss of prime
on pumps, mixer viscosity and all types of current sensing
conditions or to stage pump motors, chillers, or other machinery.
This device combines a current transformer (CT), transducer
and high current output relay together to switch alarm circuits,
contactors and most resistive or inductive loads. The LSRX/
LSRX-C Series can perform the function of an auxiliary contact,
yet has the advantages of universal application and isolation.
Features & Benefits
FEATURES BENEFITS
Self-powered
Eliminates need for separate control voltage. Draws
power from wire being monitored
Quick-connect terminals Saves time at installation
LED indication Visual indication of relay status
Built in current sensor
will monitor up to
200A loads
Eliminates the need for a stand alone current
transformer and also provides isolation between
the monitored and control circuits
Accessories
Informer IR Kit-36 (36” infrared adapter cable)
Attaches to the face of the unit to provide
remote diagnostics without opening the panel.
Specifications
Input Characteristics
Operating Current 5-200A Continuous
Minimum Pull-in Current 4.5A (typical), 7.0A (max)*
Power Induced from AC conductor
Output Characteristics
Relay Output Rating
(SPST - Form A)
Pilot Duty 480VA @ 240VAC, B300
General Purpose 5A @ 240VAC
Electrical Life 1x10
5
Mechanical Life 1x10
7
Maximum Conductor
Diameter 0.7 in.
Output Terminals
LSRX 0.25” quick-connect fast-ons
LSRX-C depluggable screw terminals
Torque Rating 3.0 in.-lbs.
Figure 1: Typical Wiring Diagram
Ordering Information
MODEL DESCRIPTION
LSRX Fast-on terminal
LSRX-C Depluggable screw terminals
LSRX-OEM Fast-on terminals, 10 pack
