Littelfuse

Littelfuse

Littelfuse is a diversified industrial technology manufacturing company empowering a sustainable, connected, and safer world. Across more than 20 countries, and with approximately 16,000 global associates. Littelfuse partners with customers to design and deliver innovative, reliable solutions. Serving more than 100,000 end customers, Littelfuse's products are found in various industrial, transportation, and electronics end markets—everywhere, every day. Headquartered in Chicago, Illinois, United States, Littelfuse has been driving innovation and technology and building communities for over 95 years.

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Littelfuse
The ALT alternating relays are used to alternate between two loads. The ALT is commonly used in duplex pumping applications to balance the runtime of both pumps. The ALT-S is used in single high-level float applications. When the float switch opens, the alternating relay changes state, forcing the other pump to run the next time the float closes. All ALT relays have a built-in debounce feature that prevents the relay from changing state if the switch or float contact bounces momentarily. The ALT-X has an internal cross-connected relay and is used in dual high-level float applications. These floats are commonly referred to as lead and lag floats. The pumps alternate as in the ALT-S version but the crossconnected relay configuration allows both pumps to run simultaneously when both the lead and lag floats are closed. These relays are also available with a built-in switch (SW option) that is used to manually force one of the pumps to run every time the float switch is closed. This is helpful when a pump has been removed for repair or for test purposes. In the case of the ALT-X-SW, the switch essentially forces one pump to be the lead pump, while still allowing the second to run when both floats are closed. Must use the OT08PC socket for UL Rating!
MFR: Littelfuse
MFR #: ALT-115-S-SW
UPC: 079458991314
Item #: 1382862
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Phone: 1-855-999-2372 Email Contact Us
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Littelfuse
Ground Fault Ground-Check Monitor
MFR: Littelfuse
MFR #: SE-105
UPC: 079458188233
Item #: 454484
Available to Order
$5565.63 each
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Littelfuse
Gf/Gc Term Assembly 5.6V 50W Tc
MFR: Littelfuse
MFR #: SE-TA6A
UPC: 079458989540
Item #: 531235
Available to Order
$1949.48 each
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Littelfuse
Used On Systems Up To 1 kV.
MFR: Littelfuse
MFR #: ER-600VC
UPC: 079458977950
Item #: 450698
Available to Order
$1681.03 each
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Littelfuse
50-W ground-check termination assembly with convenient mounting holes and screw terminals.
MFR: Littelfuse
MFR #: SE-TA12A
UPC: 079458989489
Item #: 482948
Available to Order
$1949.48 each
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Littelfuse
Used when replacing an Atkinson Omser II with an SE-130-Series Monitor.
MFR: Littelfuse
MFR #: PMA-8
UPC: 079458978421
Item #: 1008517
Available to Order
$1690.93 each
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Littelfuse
The SE-325 Neutral-Grounding-Resistor Monitor is used on resistance-grounded systems up to 25 kV to monitor the integrity of the neutral-to-ground path and to detect ground faults. It measures current and voltage in a transformer or generator neutral-to-ground connection and continuity of the neutral-grounding resistor (NGR). The SE-325 coordinates these three measurements to detect a loose connection, corrosion, ground fault, or NGR failure, and provides one alarm or trip output contact.
MFR: Littelfuse
MFR #: SE-325
UPC: 079458988079
Item #: 1280879
Available to Order
$6008.93 each
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Littelfuse
Remote indication and reset for the SE-330, SE-330AU, and SE-330HV. NEMA 4 and NEMA 13 rating. Standard 22-mm mounting.
MFR: Littelfuse
MFR #: RK-332
UPC: 079458987836
Item #: 1204732
Available to Order
$1754.50 each
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Littelfuse
The EFCT series is a sensitive nickel-core current transformer used with Littelfuse relays to detect low levels of earth-leakage current.
MFR: Littelfuse
MFR #: EFCT-1
UPC: 079458977684
Item #: 534791
Available to Order
$2728.10 each
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Littelfuse
The SE-330 is an advanced ground-fault and neutral-grounding resistor monitoring relay that is compliant with Rule10-302 of the 2018 Canadian Electrical Code Part I (CE Code). It measures neutral current, neutral-to-ground voltage, and neutral-to-ground resistance. It provides continuous monitoring of the neutral-to-ground path to verify that the neutral-grounding resistor (NGR) is intact and that it has not been bypassed or shorted. An open NGR renders currentsensing ground-fault protection inoperative and could result in a false belief that the system is functioning properly. A shorted NGR results in higher-than-expected ground-fault current. The SE-330 can be used with low- and medium-voltage transformers and generators with low- or high-resistance grounding used in processing, manufacturing, chemical, pulp and paper, petroleum, and water-treatment facilities. For high-voltage applications, use the SE-330HV. For applications that require conformance to Australian standards, use the SE-330AU.
MFR: Littelfuse
MFR #: SE-330-SMA
UPC: 079458988604
Item #: 1204733
Available to Order
$1258.10 each
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Littelfuse
The EFCT series is a sensitive nickel-core current transformer used with Littelfuse relays to detect low levels of earth-leakage current.
MFR: Littelfuse
MFR #: EFCT-26
UPC: 079458977721
Item #: 866232
Available to Order
$1708.20 each
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Littelfuse
50-W ground-check termination assembly with convenient mounting holes and wire leads.
MFR: Littelfuse
MFR #: SE-TA6A-WL
UPC: 079458989557
Item #: 656337
Available to Order
$2237.33 each
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Littelfuse
Used On Systems Up To 15 kV.
MFR: Littelfuse
MFR #: ER-15KV
UPC: 079458977905
Item #: 501382
Available to Order
$9600.28 each
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Littelfuse
MOTOR OVERLOAD PROTECTION 8000
MFR: Littelfuse
MFR #: MP8000
UPC: 079458046113
Item #: 719830
Available to Order
$2811.85 each
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Littelfuse
CURRENT SENSOR
MFR: Littelfuse
MFR #: ECSL41AD
UPC: 079458992724
Item #: 1238971
Available to Order
$597.93 each
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Littelfuse
NGR MON.,UNIV.,SC FIBER & RJ45,61850
MFR: Littelfuse
MFR #: SE-330-07-00
UPC: 079458812848
Item #: 1528349
In Stock -
$24091.68 each
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Littelfuse
NGR MON.,UNIV., ETHERNET SC FIBER & RJ45
MFR: Littelfuse
MFR #: SE-330-04-00
UPC: 079458812473
Item #: 1526332
Available to Order
$22417.48 each
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Littelfuse
The PGR-3100 indicates the presence of voltage on each phase of a three-phase system. The LEDs on the panel illuminate when voltage is present. When a ground-fault occurs, the voltage on the faulted phase reduces to ground potential, causing the LEDs for the faulted phase to dim. On a resistance grounded or ungrounded system the LEDs for the unfaulted phases become brighter. Ungrounded ac systems are required by the National Electrical Code (NEC) Article 250.21(B) and the Canadian Electrical Code Part 1, Section 10-106 (2) to have ground detectors, such as the PGR-3100, installed on the system. External potential transformers (PTs) can be used to step down system voltage, allowing the PGR-3100 to be applied to any system voltage. PTs are not required for system voltages up to 600 Vac.
MFR: Littelfuse
MFR #: PGR-3100
UPC: 079458177312
Item #: 952482
Available to Order
$2571.35 each
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Littelfuse
The ARP Series is used in systems where equal run time for two motors is desirable. The selector switch allows selection of alternation of either load for continuous operation. LEDs 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 units input voltage (see connection diagrams on datasheet). 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 isolated.
MFR: Littelfuse
MFR #: ARP63S
UPC: 079458991505
Item #: 584614
Available to Order
$452.98 each
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Littelfuse
Panel-mounted analog am meter displays the Ground-Fault Current as a percentage of the set-point.
MFR: Littelfuse
MFR #: PGA-0500
UPC: 079458178173
Item #: 1022868
Available to Order
$1885.35 each
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Littelfuse
The DCSA Series is a loop-powered, linear output current transducer that provides an output that is directly proportional to the RMS AC current passing through the LCSC10T12 sensor. The DCSA provides either an analog current or voltage: 4 - 20 mA, 1 to 5VDC, or 2 to 10VDC. Each unit is factory calibrated for monitoring (with the LCSC10T12 connected) in one of four ranges; 0 - 5, 0 - 10, 0 - 20, or 0 - 50A. Zero and span adjustments allow field calibration if needed. The DCSA mounts on both DIN 1 and DIN 3 rails.
MFR: Littelfuse
MFR #: DCSA50
UPC: 079458992083
Item #: 1534386
Available to Order
$503.20 each
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Littelfuse
The SE-330 is an advanced ground-fault and neutral-groundingresistor monitoring relay that is compliant with Rule10-302 of the 2018 Canadian Electrical Code Part I (CE Code). It measures neutral current, neutral-to-ground voltage, and neutral-to-ground resistance. It provides continuous monitoring of the neutral-to-ground path to verify that the neutral-grounding resistor (NGR) is intact and that it has not been bypassed or shorted. An open NGR renders currentsensing ground-fault protection inoperative and could result in a false belief that the system is functioning properly. A shorted NGR results in higher-than-expected ground-fault current. The SE-330 can be used with low- and medium-voltage transformers and generators with low- or high-resistance grounding used in processing, manufacturing, chemical, pulp and paper, petroleum, and water-treatment facilities. For high-voltage applications, use the SE-330HV. For applications that require conformance to Australian standards, use the SE-330AU.
MFR: Littelfuse
MFR #: SE-330-03-01
UPC: 079458988420
Item #: 1502618
Available to Order
$22417.48 each
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Littelfuse
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.
MFR: Littelfuse
MFR #: ISS-105
UPC: 079458994315
Item #: 1569571
Available to Order
$2524.80 each
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Littelfuse
The SE-330 is an advanced ground-fault and neutral-groundingresistor monitoring relay that is compliant with Rule10-302 of the 2018 Canadian Electrical Code Part I (CE Code). It measures neutral current, neutral-to-ground voltage, and neutral-to-ground resistance. It provides continuous monitoring of the neutral-to-ground path to verify that the neutral-grounding resistor (NGR) is intact and that it has not been bypassed or shorted. An open NGR renders currentsensing ground-fault protection inoperative and could result in a false belief that the system is functioning properly. A shorted NGR results in higher-than-expected ground-fault current. The SE-330 can be used with low- and medium-voltage transformers and generators with low- or high-resistance grounding used in processing, manufacturing, chemical, pulp and paper, petroleum, and water-treatment facilities. For high-voltage applications, use the SE-330HV. For applications that require conformance to Australian standards, use the SE-330AU.
MFR: Littelfuse
MFR #: SE-330-03-00
UPC: 079458988413
Item #: 1445479
Available to Order
$22417.48 each
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Littelfuse
The PC-102 series is a dual-channel switch that provides dual protection against seal failures and over-temperature in submersible pumping applications. The relays have two form-C isolated output relays and two LEDs, which illuminate when each associated output relay is energized. The sensitivity adjustment (4.7k-100kOhms) allows you to define the input impedance at which the output relays will change state. The sensitivity for the over-temperature detector can be set to 4k Ohms with use of the DIP switches.
MFR: Littelfuse
MFR #: PC-102CICI-LT
UPC: 079458997699
Item #: 595113
Available to Order
$722.23 each
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Littelfuse
Operates on AC ungrounded systems. The EL3100 is a self-powered ground-fault and phase voltage indication system for 3-phase systems. The EL3100 meets the National Electrical Code (NEC, Article 250.21(B)) and the Canadian Electrical Code (CEC) requirements for ground detectors for ungrounded alternating-current systems. Voltage connections are provided on the EL3100 for 208, 240, 480, and 600-V systems. Three green LEDs on the EL3100 indicate the presence of phase-to-ground voltage and one red LED indicates a ground fault. The EL3100 can operate stand-alone or with up to five remote LED indicators. A solid-state relay output provides indication of a ground fault. The output relay is closed when the 3-phase neutral voltage shifts as the result of ground leakage.
MFR: Littelfuse
MFR #: EL3100-00
UPC: 079458825527
Item #: 738995
Available to Order
$3474.88 each
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Littelfuse
RK-310R-01 LED REMOTE KIT RED C/W LBL#1
MFR: Littelfuse
MFR #: RK-310R-01
UPC: 079458825510
Item #: 1499413
Available to Order
$377.98 each
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Littelfuse
The SE-CS30 series is a sensitive nickel-core current transformer used with Littelfuse relays to detect low levels of earth-leakage current.
MFR: Littelfuse
MFR #: SE-CS30-8
UPC: 079458989267
Item #: 1475951
Available to Order
$7119.38 each
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Littelfuse
CT 600:1 WITH FLUX COND 31MM
MFR: Littelfuse
MFR #: ELCT30-31
UPC: 079458232684
Item #: 1204731
Available to Order
$1591.03 each
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Littelfuse
COMPOUND HEAT SINK 2OZ JAR
MFR: Littelfuse
MFR #: P0200-20
UPC: 079458997477
Item #: 748630
Available to Order
$123.28 each
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Littelfuse
ARC-FLASH RELAY
MFR: Littelfuse
MFR #: AF0500-00
UPC: 079458845310
Item #: 1069006
Available to Order
$14500.65 each
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Littelfuse
1-PHASE VOLTAGE MONITOR/ 190-2
MFR: Littelfuse
MFR #: 50R200
UPC: 079458990706
Item #: 1407332
Available to Order
$765.65 each
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Littelfuse
LIQUID LEVEL CONTROL
MFR: Littelfuse
MFR #: LLC54AA
UPC: 079458996357
Item #: 1553524
Available to Order
$220.18 each
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Littelfuse
LIQUID LEVEL CONTROL
MFR: Littelfuse
MFR #: LLC52BA
UPC: 079458996340
Item #: 1475434
Available to Order
$378.10 each
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Littelfuse
GF-GC MON, AC/DC SUPPLY, EXT-GC
MFR: Littelfuse
MFR #: SE-134C-XGC-00
UPC: 079458809107
Item #: 228293
Available to Order
$16961.58 each
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Littelfuse
The SE-100T is a ground-fault-relay test unit designed to test the current pickup level of ground-fault protection. The tester injects current through the window of installed ground-fault current transformers to verify the operation of ground-fault monitors and relays. It is used on substations, motor control centers (MCCs), central distribution panels, switchboards, and test benches to verify relay operation. The SE-100T tests the entire ground-fault circuit including current transformers, wiring, ground-fault relay and the operation of the interrupting device. It is recommended to test every relay and its current interrupting device annually.
MFR: Littelfuse
MFR #: SE-100T
UPC: 079458987867
Item #: 1566844
Available to Order
$3097.03 each
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Littelfuse
The ECS Series of single-phase AC current sensors is a universal, overcurrent or undercurrent sensing control. Its built-in toroidal sensor eliminates the inconvenience of installing a stand-alone current transformer. Includes onboard adjustments for current sensing mode, trip point, and trip delay. Detects over or undercurrent events like locked rotor, loss of load, an open heater or lamp load, or proves an operation is taking place or has ended. Operation: Input voltage must be supplied at all times for proper operation. When a fault is sensed throughout the trip delay, the output relay is energized. When the current returns to the normal run condition or zero, the output and the delay are reset. If a fault is sensed and then corrected before the trip delay is completed, the relay will not energize and the trip delay is reset to zero.
MFR: Littelfuse
MFR #: ECS41BD
UPC: 079458992458
Item #: 1503590
Available to Order
$581.55 each
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Littelfuse
The LCSC10T12 is a toroidal current sensor for use with the DCSA Series current transducer.
MFR: Littelfuse
MFR #: LCSC10T12
UPC: 079458995961
Item #: 1534387
Available to Order
$288.35 each
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Littelfuse
The LSR-XXX load sensors use current levels to determine feed rates, tool wear, loss of prime on pumps, mixer viscosity and all types of overload and underload conditions. They may also be used to stage pump motors, chillers and other machinery. These devices combine a current transformer (CT) with Form C (SPDT) relay contacts to switch alarm circuits, contactors or any resistive or inductive load. One simple screwdriver adjustment will calibrate the sensor for all single-phase or 3-phase applications up to 100hp.
MFR: Littelfuse
MFR #: LSR-115
UPC: 079458996661
Item #: 543443
Available to Order
$587.28 each
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Littelfuse
For splitter applications. Both terminations must be present.
MFR: Littelfuse
MFR #: SE-TA12B
UPC: 079458989519
Item #: 1526753
Available to Order
$3603.33 each
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Littelfuse
The ECS Series of single-phase AC current sensors is a universal, overcurrent or undercurrent sensing control. Its built-in toroidal sensor eliminates the inconvenience of installing a stand-alone current transformer. Includes onboard adjustments for current sensing mode, trip point, and trip delay. Detects over or undercurrent events like locked rotor, loss of load, an open heater or lamp load, or proves an operation is taking place or has ended. Operation: Input voltage must be supplied at all times for proper operation. When a fault is sensed throughout the trip delay, the output relay is energized. When the current returns to the normal run condition or zero, the output and the delay are reset. If a fault is sensed and then corrected before the trip delay is completed, the relay will not energize and the trip delay is reset to zero.
MFR: Littelfuse
MFR #: ECS41BC
UPC: 079458992441
Item #: 1503591
Available to Order
$581.55 each
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Littelfuse
The 233P is a single-phase pump monitor designed to protect single-phase pumps from dry-well, dead-head, jammed impeller, rapid cycle, overvoltage and undervoltage conditions. The 233P protects 230 volt, 2 or 3 wire, 1/3 to 3hp pumps. A calibration adjustment allows the 233P to be calibrated to your specific pumping applications, thereby reducing the possibility of false or nuisance tripping. A proprietary microcontroller based voltage, power factor and current-sensing circuit constantly monitors for power fluctuations, overcurrent and underload conditions. When an abnormality, such as loss of suction, is detected, the 233P deactivates its output relay and directly disconnects the pump motor. The relay then begins its user-selectable Restart Delay (dry-well recovery) timer. When the timer expires or power is removed and reapplied, the relay reactivates its output relay and allows the pump to turn back on. An infrared LED communicates directly with a hand-held diagnostic tool called the Informer (sold separately).
MFR: Littelfuse
MFR #: 233P-1.5-ENCL
UPC: 079458990348
Item #: 1029249
Available to Order
$1055.73 each
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Littelfuse
The SE-CS30 series is a sensitive nickel-core current transformer used with Littelfuse relays to detect low levels of earth-leakage current.
MFR: Littelfuse
MFR #: SE-CS30-26
UPC: 079458989205
Item #: 1390088
Available to Order
$2000.98 each
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Littelfuse
The LSR-0 is a self-powered load sensor intended for use as a proof relay. It is used to verify that current is flowing as intended. It has a guaranteed 15A pull-in current and 2.5A drop-out current. Proof relays are typically used to interlock fans, compressors, motors, heating elements and other devices. The LSR-0 is self-powered, that is, it draws its power from the wire being monitored so it does not require separate control power wiring.
MFR: Littelfuse
MFR #: LSR-0
UPC: 079458996654
Item #: 891266
Available to Order
$363.78 each
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Littelfuse
The ARP Series is used in systems where equal run time for two motors is desirable. The selector switch allows selection of alternation of either load for continuous operation. LEDs 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 units input voltage (see connection diagrams on datasheet). 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 isolated.
MFR: Littelfuse
MFR #: ARP43S
UPC: 079458991475
Item #: 729753
Available to Order
$452.98 each
Availability
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Littelfuse
The ISS-102 is a two-channel, intrinsically-safe switch designed for multiple uses including a pump-up/pump-down (latching) controller or two-channel switch. Two LEDs indicate the state of the intrinsically-safe inputs and output relays and user-selectable options are available including a variable resistance threshold for float inputs. The ISS-102 enclosure is surface or DIN rail mountable. -LC Each input channel is active when the corresponding switch is closed. When the lag input (CH2) is activated, the output closes. Applying latching logic, the output contact remains closed until the lead (CH1) and the lag (CH2) inputs are deactivated. Sensitivity is fixed at 100kOhms with a debounce time delay of 2 seconds. -DCS This dual-channel switch has a debounce delay feature of 0.5 seconds. Resistance probes or switches can be used on its inputs. Two LEDs illuminate the output state of either form A relay. Sensitivity is fixed at 100kOhms with a debounce time delay of 0.5 seconds. -MC By selecting the proper functionality through the dip switches, you can define a pump-up or pump-down, single or dual channel non-latching switch. The sensitivity adjustment (4.7k-100kOhms) allows you to define the input impedance at which the output relays (one form A & one form C) will change state, with a debounce time delay of 0.5 or 2 seconds.
MFR: Littelfuse
MFR #: ISS-102ACI-MC
UPC: 079458994278
Item #: 1371367
Available to Order
$1162.78 each
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Littelfuse
Used On Systems Up To 5 kV.
MFR: Littelfuse
MFR #: ER-5KV
UPC: 079458977936
Item #: 1311635
Available to Order
$7840.25 each
Availability
Location Available Qty
Littelfuse
The ECS Series of single-phase AC current sensors is a universal, overcurrent or undercurrent sensing control. Its built-in toroidal sensor eliminates the inconvenience of installing a stand-alone current transformer. Includes onboard adjustments for current sensing mode, trip point, and trip delay. Detects over or undercurrent events like locked rotor, loss of load, an open heater or lamp load, or proves an operation is taking place or has ended. Operation: Input voltage must be supplied at all times for proper operation. When a fault is sensed throughout the trip delay, the output relay is energized. When the current returns to the normal run condition or zero, the output and the delay are reset. If a fault is sensed and then corrected before the trip delay is completed, the relay will not energize and the trip delay is reset to zero.
MFR: Littelfuse
MFR #: ECSL61AH
UPC: 079458992762
Item #: 1090804
Available to Order
$597.93 each
Availability
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