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
Solid State Timer
MFR: Littelfuse
MFR #: KSDB314SP
UPC: 079458995565
Item #: 150727
In Stock -
$231.45 each
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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
3-PHASE VOLTAGE MONITOR W/ DIS
MFR: Littelfuse
MFR #: 601
UPC: 079458989632
Item #: 1543863
Available to Order
$1557.80 each
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Littelfuse
PIN 8-PIN SOCKET
MFR: Littelfuse
MFR #: NDS-8
UPC: 079458997132
Item #: 746926
Available to Order
$29.50 each
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Littelfuse
3-PHASE VOLT MON/ 190-480V/AD
MFR: Littelfuse
MFR #: 460-B
UPC: 079458990591
Item #: 1359341
Available to Order
$469.80 each
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Littelfuse
SOCKET, 8 PIN OCTAL
MFR: Littelfuse
MFR #: OT08PC
UPC: 079458997422
Item #: 162871
Available to Order
$46.90 each
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Littelfuse
2X2 D.O.M. W/RELAY
MFR: Littelfuse
MFR #: KRDM215M
UPC: 079458994773
Item #: 1489833
Available to Order
$265.20 each
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Littelfuse
1-PHASE VOLTAGE MONITOR/ 115V/
MFR: Littelfuse
MFR #: 460-100-SP
UPC: 079458990508
Item #: 878271
Available to Order
$479.25 each
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Littelfuse
3-PHASE VOLTAGE MONITOR/ 190-4
MFR: Littelfuse
MFR #: 102A3
UPC: 079458990058
Item #: 24880
Available to Order
$736.30 each
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Littelfuse
DELAY ON BREAK TIMER
MFR: Littelfuse
MFR #: TSB422
UPC: 079458020434
Item #: 887406
Available to Order
$242.03 each
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Littelfuse
3-PHASE VOLT MON/ 190-480V/ AD
MFR: Littelfuse
MFR #: 460
UPC: 079458989625
Item #: 150225
Available to Order
$386.28 each
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Littelfuse
UNIVERSAL ADJUSTABLE FLASHER
MFR: Littelfuse
MFR #: FSU1004
UPC: 079458993622
Item #: 1260645
Available to Order
$406.55 each
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Littelfuse
SOLID STATE TIMER (D.O.M.)
MFR: Littelfuse
MFR #: MSM42W6
UPC: 079458997095
Item #: 207080
Available to Order
$185.10 each
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Littelfuse
TRACK FOR DIN RAIL
MFR: Littelfuse
MFR #: P1023-20
UPC: 079458997644
Item #: 1263271
Available to Order
$38.68 each
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Littelfuse
DIN 11-PIN SOCKET
MFR: Littelfuse
MFR #: NDS-11
UPC: 079458997125
Item #: 602774
Available to Order
$51.20 each
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Littelfuse
ON-DELAY TIMER/ 460V/ ADJUSTAB
MFR: Littelfuse
MFR #: T10400
UPC: 079458999105
Item #: 1567495
Available to Order
$673.38 each
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Littelfuse
RECYCLING TIMER
MFR: Littelfuse
MFR #: HRDR431A1R
UPC: 079458993974
Item #: 983952
Available to Order
$356.03 each
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Littelfuse
DIGI-SET (D.O.B.)
MFR: Littelfuse
MFR #: TDBL120ALD
UPC: 079458999556
Item #: 942021
Available to Order
$570.18 each
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Littelfuse
The TDU Series are encapsulated solid-state, delay-on-make timers that combine digital timing circuitry with universal voltage operation. The TDU offers DIP switch adjustment allowing accurate selection of the time delay over the full time delay range. This series is an excellent choice for process control systems and OEM equipment. Operation (Delay-on-Make): Upon application of input voltage, the time delay begins. The output is de-energized before and during the time delay. At the end of the time delay, the output energizes and remains energized until input voltage is removed. Reset: Removing input voltage resets the time delay and output.
MFR: Littelfuse
MFR #: TDU3000A
UPC: 079458999976
Item #: 133032
Available to Order
$195.43 each
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Littelfuse
The 455 Series are 3-phase voltage monitors that combine load and line side monitoring to offer complete protection. Monitoring the load side will alert the user of contactor failure or impending contactor failure. Line side monitoring will also protect the motor from damaging fault conditions that may be present prior to the motor starting. With other line/load side monitors, the motor must be started before a voltage fault is detected. With the 455, your motor is fully protected at all times. The 455 Series are 3-phase, dual range voltage monitors that protect 190-480VAC, 50*/60Hz motors, regardless of their size. It automatically selects between the 200V and 400V range when the user selects the nominal voltage setpoint. Other adjustments include a 2-30 second trip delay, a 2-300 second restart delay (and manual restart) and a voltage unbalance trip point of 2-8%. The voltage monitors circuitry is powered through the line side connections, so there is no need for separate control power, making it easy to install. Equipped with an infrared LED, the 455 Sereies can communicate to the optional hand-held diagnostic tool, Informer-MS to obtain valuable information such as real-time voltage, voltage unbalance on both line and load sides, motor run hours, last 20 faults, last 32 motor starts, high and low voltage trip points, voltage unbalance trip point, restart and trip delay settings, LED status and more.
MFR: Littelfuse
MFR #: 455
UPC: 079458989618
Item #: 1506441
Available to Order
$873.23 each
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Littelfuse
The 250A is a 3-phase, auto-ranging, dual-range voltage monitor that protects 190-480VAC, 50*/60Hz motors regardless of size from low and high voltage, unbalance/single-phase, and reverse-phase. The product provides a user selectable nominal voltage setpoint and the voltage monitor automatically selects between the 200V and 400V range. The 250A also features adjustable or manual restart delay. This unique microcontroller-based voltage and phase-sensing device constantly monitors the 3-phase voltages to detect harmful power line conditions. When a harmful condition is detected, the Littelfuses output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to acceptable levels. The Model 250A includes advanced single LED diagnostics. Five different light patterns distinguish between faults and normal conditions.
MFR: Littelfuse
MFR #: 250A
UPC: 079458990447
Item #: 1564903
Available to Order
$810.23 each
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Littelfuse
The FA and FS Series Flashers have proven their reliability through years of use on communication towers, smoke stacks, cooling towers, tall buildings, bridges and utility towers. The highest quality components are encapsulated in a rugged plastic housing with a molded-in heat transfer plate. The flash rate, ratio, and failsafe design meet FAA regulations. Zero voltage switching can increase lamp life up to ten times. The FS155-30RF & FS165-30RF include superior RF filtering circuitry for use in high RF installations, including AM hot towers. Operation: FS Series - Flasher (OFF First), FA Series - Flashers & Aux. Modules: Upon application of input voltage, the T2 OFF time begins. At the end of the OFF time, the T1 ON time begins and the load energizes. At the end of T1, T2 begins and the load de-energizes. This cycle repeats until voltage is removed. Reset: Removing input voltage resets the output and the sequence to T2.
MFR: Littelfuse
MFR #: FS146
UPC: 079458993417
Item #: 1551385
Available to Order
$129.80 each
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Littelfuse
The 777 is a fully programmable electronic overload relay designed to protect any motor drawing 2-800 full load amps (external CTs are required above 90 amps). The 777 (family of products) is for 3-phase 200-480VAC applications, with several specialized units for other voltage ranges and unique applications. Common applications include conveyor systems, HVAC equipment, saws and grinders, fan motors, and almost any pumping application. Some unique applications include use with a Subtrol equipped Franklin submersible motor to detect high motor temperatures and applications where a fast linear trip is required. All of the overload relays provide unsurpassed protection by combining overload, voltage, phase loss and reversal, voltage and current unbalance, power monitoring, and underload based on current in one package. For standalone applications, the units incorporate a 3-digit LED display that is used for programming, providing real-time operational information and displaying diagnostic codes to aid in troubleshooting a fault condition. The units also feature a communications port that can be used with communication modules listed in the 777 accessories section to form a Modbus, DeviceNet Profibus, or Ethernet network. Up to 99 units can be remotely monitored and controlled from a PC, PLC, or SCADA system, and data logging through a PC with the optional Solutions software. This capability allows for a simple, cost-effective way to meet new requirements for arc-flash safety.
MFR: Littelfuse
MFR #: 777-LR-P2
UPC: 079458991048
Item #: 182434
In Stock -
$2811.85 each
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Littelfuse
The TDM/TDMH/TDML Series is a delay-on-make timer that combines accurate digital circuitry with isolated, DPDT relay contacts in an industry standard 8-pin plug-in package. DIP switch adjustment allows precise selection of the time delay over the full time delay range. The TDM/TDMH/TDML Series is the product of choice for custom control panel and OEM designers. Operation (Delay-on-Make): Upon application of input voltage, the time delay begins. The output is de-energized before and during the time delay. At the end of the time delay, the output relay energizes and remains energized until input voltage is removed. Reset: Removing input voltage resets the time delay and output.
MFR: Littelfuse
MFR #: TDM120AL
UPC: 079458999624
Item #: 47898
Available to Order
$397.20 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 102A is a 3-phase, auto-ranging, dual-range voltage monitor that protects 190-600VAC, 50/60Hz motors regardless of size. The product provides a user selectable nominal voltage setpoint and the voltage monitor automatically selects between the 200V and 400V range. A unique microcontroller-based voltage and phase-sensing circuit constantly monitors the 3-phase voltages to detect harmful power line conditions. When a harmful condition is detected, the output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to acceptable levels. The Model 102A includes advanced single LED diagnostics. Five different light patterns distinguish between faults and normal conditions.
MFR: Littelfuse
MFR #: 102A
UPC: 079458990034
Item #: 145443
Available to Order
$344.19 each
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Littelfuse
The TMV and TSU Series are universal voltage delay-on-make timers. Two models cover all the popular voltages and time delays. Available with knob or external adjust time delay. Its simple two terminals can easily be connected in series with a relay coil, contactor coil, solenoid, lamps, small motor, etc., to delay their energization, prevent short cycling or to sequence on various loads. Operation (Delay-on-Make):Upon application of input voltage, the time delay begins. The output is de-energized before and during the time delay. At the end of the time delay, the output energizes and remains energized until input voltage is removed. Reset: Removing input voltage resets the time delay and output.
MFR: Littelfuse
MFR #: TMV8000
UPC: 079458010794
Item #: 496304
Available to Order
$161.58 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 TDUB Series combines digital timing circuitry with universal voltage operation. Voltages of 24 to 240VAC and 12 to 24VDC are available in three ranges. The TDUB Series offers DIP switch selectable time delays ranging from 0.1 seconds to 102.3 minutes in three ranges. Its 1A rated output, ability to operate on multiple voltages, and wide range of switch selectable time delays make the TDUB Series an excellent choice for process control systems and OEM equipment. Operation (Delay-on-Break): Input voltage must be applied before and during timing. Upon closure of the initiate switch, the output energizes. The time delay begins when the initiate switch is opened (trailing edge triggered). The output remains energized during timing. At the end of the time delay, the output de-energizes. The output will energize if the initiate switch is closed when input voltage is applied. Reset: Reclosing the initiate switch during timing resets the time delay. Loss of input voltage resets the time delay and output.
MFR: Littelfuse
MFR #: TDUB3000A
UPC: 079458006773
Item #: 185186
Available to Order
$344.08 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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