LITTELFUSE SYMCOM

Since 1974, SymCom has been a leader in electronic control and protection design and manufacturing with an array of current and voltage monitors, motor and pump controls, and custom electronic controls under the brand names of MotorSaver® and PumpSaver®. In 2014, electronic’s leader Littelfuse acquired SymCom. Founded in 1927, Littelfuse is the world leader in circuit protection with growing global platforms in power control and sensing. Littelfuse Symcom products monitor power supplies and protect motors and other pumps before damage occurs from over-voltage, under-voltage, voltage unbalance, single-phasing, phase reversal, over-current, under-current, current unbalance and ground fault.

Littelfuse SymCom products include a variety of voltage monitors, current monitors, remote monitors, overload relays and power factor monitors for the motor protection market. Littelfuse Symcom continues to provide cutting-edge electronic technology with newly integrated micro-controllers with enhanced communications and capabilities. Their products have been upgraded over the years to include the latest electronic technology. More powerful state-of-the-art micro-controllers are being integrated into new products, enhancing communications and controls capabilities.

As a Littefuse licensed distributor, National Fuse Products offers a wide variety of Littelfuse Symcom products. For more in-depth product information, please see the Littelfuse Catalog of Protection Relays and Controls. If the Littelfuse Symcom product you are looking for is not shown here on our website – just give us a call at 800-328-0496 or email us at sales@nationalfuse.com and our customer service team will be glad to help you. We normally are able to get any part or product you are looking for at a very competitive price.

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Catalog #

Description

Price

3PH 200-480VAC VOLTAGE MONITOR

$1,091.98

1PH 100/240V MONITOR

$635.11

ALTERNATING RELAY 8-pin for alternating applications. Rotary switch allows user to lock internal relay to one specific load. Description The ARP Series is used in systems where equal run time for two motors is desirable. The selector switch allows selection of alternation or for continuous operation of either load. LED’s indicate the status of the output relay. This versatile series may be front panel mounted (BZ1 accessory required) or 35 mm DIN-rail mounted with an accessory socket.Operation Alternating: When the rotary switch is in the “alternate” position, alternating operation of Load A and Load B occurs upon the opening of the control switch S1. To terminate alternating operation and cause only the selected load to operate, rotate the switch to position “A” to lock Load A or position “B” to lock Load B. The LEDs indicate the status of the internal relay and which load is selected to operate. Note: Input voltage must be applied at all times for proper alternation. The use of a solid-state control switch for S1 may not initiate alternation correctly. S1 voltage must be from the same supply as the unit’s input voltage (see connection diagrams). Loss of input voltage resets the unit; Load A becomes the lead load for the next operation.Duplexing (Cross-Wired): Duplexing models operate the same as alternating relays and when both the Control (S1) and Lag Load (S2) Switches are closed, Load A and Load B energize simultaneously.The DPDT 8-pin, cross-wired option, allows extra system load capacity through simultaneous operation of both motors when needed. Relay contacts are not isolate

$224.28

BUSBAR TERMINAL Description
A key objective for panel designers is safe distribution
of power to multiple fuse holders in a compact design.
The Littelfuse UL 508 Listed bus bar system eliminates
most wire terminations in a time saving package. A power
distribution block and associated conductors are no longer
needed to feed multiple POWR-SAFE fuse holders.
Features/Benefits
Touch-safe design offers protection when replacing fuses
Compact design
35 mm DIN-rail mountable
Available in one and three phase configurations
Can be cut down to optimal size
Recommended Fuse Holders
LFPSC Series
LPSC / LPSM Series (600 V)
LPHV Series (1000 V)
Web Resources
Download technical information: littelfuse.com/busbar

$21.06

CURRENT TRANSFORMER

$287.56

7A 120V RELAY The ISS-105 is a “smart” five-channel intrinsically safe relay and pump controller. The ISS-105 can be configured for a wide variety of applications including alternating or non-alternating duplex, duplex separate pump stop (SPS), triplex and quadplex applications. It can be set up for pump-up or pump-down applications or can be used as a five-channel relay. The ISS-105 has a long list of features that are needed for multiple pump applications. The ISS-105 can indicate low, high and out-of-sequence alarms. If an out-of-sequence alarm occurs, the skipped pump(s) will be started as intended. The Model ISS-105 can be set up to do non-alternating control, alternating control and alternating control with one non-alternating pump. The non-alternating pump is intended for use with an emergency or jockey pump. The ISS-105 can start an emergency pump once every 50 cycles to keep it working freely. Using the built-in DIP switches, individual pumps can be disabled when taken out of service for repair or maintenance

$721.39

LIQUID LEVEL CONTROL The LLC4 combines resistance sensing circuitry with solid-state timing to provide single probe level maintenance. On adjustable units, the sensitivity adjustment allows accurate level sensing while ignoring foaming agents and floating debris. Isolated 12VAC is provided at the probe to prevent electrolysis. A trickle current of less than 1mA determines the presence or absence of conductive liquid between the probe and common. The LLC4 Series can be used with many types of low voltage (resistance changing) transducers to perform other control functions like temperature limit control, photo limit control, condensation sensing, and ice sensing. Operation Drain (Pump-Down Mode): When the liquid level rises and touches the probe, the time delay begins. This time delay prevents rapid cycling of the output relay and its load. At the end of the time delay, the output relay energize and remain energized until the liquid level falls below the probe level. The output relay de-energize and remain de-energized until the liquid rises and touches the probe. Fill (Pump Up Mode): When the liquid level falls below the probe, the time delay begins. This time delay prevents rapid cycling of the output relay and its load. At the end of the time delay, the output relay energize and remain energized until the liquid level rises and touches the probe. The output relay then de-energize and remain de-energized until the liquid level again falls below the probe level.

$147.56

LIQUID LEVEL CONTROL LC54BAS 120VAC For Fill (pump-up) operation with adjustable sense resistance and reverse connection (#8 low, #6 high) Description The LLC5 provides dual probe conductive liquid level control in a convenient octal plug-in package. Models are available for fixed fill or drain operation. Isolated, pulsed DC voltage on the probes prevents electrolytic plating. Less than 1 mA of current is used to sense the presence of conductive liquid between the probes and common. On adjustable units, the sensitivity adjustment eliminates false tripping caused by floating debris and foaming agents. Operation Drain (Pump-Down Mode): When the liquid level rises and touches the high level probe, the output relay and LED energize and remain energized until the liquid level falls below the low level probe. The output relay and LED de-energize and remain de-energized until the liquid rises and touches the high level probe. Fill (Pump-Up Mode): When the liquid level falls below the low level probe, the output relay and LED energize and remain energized until the liquid level rises and touches the high level probe. The output relay and LED de-energize and remain de-energized until the liquid level again falls below the low level probe.

$145.42

Littelfuse LSP10277S

THERMAL VARISTOR The Littelfuse LSP10 thermally protected Surge Protective
Device is a self-protected device which is specially designed
to be used in outdoor and commercial LED lighting fixtures
for transient overvoltage protection. It is constructed with
Littelfuse thermally protected varistor technology. Its built-in
thermal disconnect function provides additional protection
to prevent catastrophic failure and fire hazard even under the
extreme circumstances of varistor end-of-life or sustaining
over voltage conditions. LSP10 series connected option
allows clear indication of thermal fault protection by discon-
necting power to luminaire thereby signally SPD module
replacement. The LSP10 SPD facilitates customer’s product
compliance to IEEE C62.41.2 Location Category C High and
US Dept of Energy MSSLC Model Spe

$34.16

Littelfuse Symcom LSRX

LOAD SENSOR 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

$113.72

8-PIN SOCKET 10A 600VAC

$11.46

8 - PIN OCTAL SOCKET

$18.21

AC PHASE CONTROL 10A 120VAC Solid State Relay SSAC Description
The PHS Series is an ideal method of changing lamp intensity,
varying the speed of a fan/motor, or controlling the temperature
of a heater. The effective output voltage is adjusted with an
accessory external potentiometer suitable for line voltage
applications.
Operation
Upon application of input voltage, effective output voltage
can be varied by changing the external resistance value. As
the external resistance increases, the effective output voltage
decreases. The inverse is also true

$73.03

REVERSE PHASE RELAY 10A 120VAC PLS Series Description
The PLS Series is a low cost phase sensitive control that
provides an isolated contact closure when the proper A-B-C
phase sequence is applied. Protects sensitive 3-phase
equipment and equipment operators from reverse rotation.
Designed to be compatible with motor overloads or other
3-phase equipment protection devices. Protection for equipment
control centers where frequent reconnection or electrical code
makes reverse rotation protection essential. Examples include:
mobile refrigerated containers, construction equipment, hoists,
pumps, conveyors, elevators and escalators.
Operation
The internal relay and LED are energized when the phase
sequence is correct. The output relay will not energize if the
phases are reversed. Reset is automatic upon correction of
the fault

$105.25

TIME DELAY RELAY The PRLM Series is designed for use in non-critical timing applications. It offers low cost, knob adjustable timing control, full 10A relay output, and onboard LED indication. The knob adjustment provides a guaranteed time range of up to 10 minutes in 6 ranges. The onboard LED indicates whether or not the unit is timing (flashing LED) as well as the status of the output The time delay is initiated when input voltage is applied. LED flashes during timing. At the end of the delay period, the output contacts energize. LED is on steady after the unit times out. Reset: Reset is accomplished by removal of input voltage. There is no false output when reset during timing.

$99.95

2 HOLD-DOWN CLIPS Securely mounts plug in controls in any position. Also provides protection against vibration. Select the PSC8 for use with NDS-8, or the PSC11 for use with NDS-11 sockets. Sold in pairs

$9.95

LED REMOTE KIT RED

$135.72

Littelfuse RM1000

REMOTE MONITOR Description
The RM-1000 Series is a motor-monitoring device to be used in
conjunction with the 777 family of products (excluding the P1
Series), 77C family of products and the 601 voltage monitors,
via Modbus protocol with a communications module. The
RM-1000/777 motor management system combines
unsurpassed electronic motor protection and critical, user-
friendly, motor monitoring.
The RM1000 Series can monitor up to 16 MotorSaver® and/or
PumpSaver® units through an RS-485 network using Modbus
RTU protocol. A second communication port allows monitoring
and control of up to 99 MotorSaver® and/or PumpSaver® units
from a computer, PLC, DCS or SCADA system and can be
accessed from the host computer or PLC with the RM1000
acting as a repeater for any of its motor protectors. In addition
to the monitoring functions, the RM-1000 can be used to reset a
tripped MotorSaver® or PumpSaver®.

$298.00

Littelfuse RS485MS-2W

COMMUNICATION MODULE Description
The RS485MS-2W is required to enable the Modbus
communications function on Model 77x-type products. This
module is required when the RM1000, RM2000 or other
Modbus capable device is used with 77x-type products.
Features Optical isolation from line potentials
Powered by the 77x product
RS-485 compliant bus drive capability
Remote reset input connection
Power connection for the Model RM100

$118.81

LED LAMP ALARM RELAY Description
The SCR9L is a universal lamp alarm relay designed to sense the
failure of flashing or steady LED beacon lamps or obstruction
lamps. The SCR9L energizes when one or more lamps fail. It
will monitor the operation of one to eight beacon or obstruction
lamps. All monitored lamps must be the same wattage and
voltage. When connected to a site monitoring system, it
provides the remote lamp monitoring protection required by the
FAA-AC No: 150/5345-43E.
Operation
When a lamp fails, the SCR9L senses a decrease in current flow.
After a 10s trip delay, the onboard LED glows and the two alarm
outputs energize. The outputs and the LED are reset when the
failed lamps are replaced and the unit is recalibrated. The SCR9L
will sense an open flasher, it will not sense a continuously ON
flasher (see FB Series). Removing input voltage de-energizes the
output and the LED‘s. It does not change the calibration

$244.95

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