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HomeProductsCircuit ProtectionElectrical, Specialty Fuses0LKN004.S
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0LKN004.S - Littelfuse Inc.

Manufacturer Part Number
0LKN004.S
Manufacturer
Littelfuse
Allelco Part Number
98D-0LKN004.S
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
47,950 pcs available, New & Original
Parts Description
FUSE LINK 4A 250VAC CARTRIDGE
Package
Cartridge, Non-Standard
Data sheet
-
RoHs Status
ROHS3 Compliant
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In stock: 47950

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Specifications

0LKN004.S Tech Specifications
Littelfuse Inc. - 0LKN004.S technical specifications, attributes, parameters and parts with similar specifications to Littelfuse Inc. - 0LKN004.S

Product Attribute Attribute Value
Manufacturer Littelfuse
Voltage Rating - AC 250 V
Size / Dimension 0.563' Dia x 2.000' L (14.30mm x 50.80mm)
Series POWR-GARD® LKN
Response Time Fast Blow
Package / Case Cartridge, Non-Standard
Package Bulk
Operating Temperature -
Product Attribute Attribute Value
Mounting Type Requires Holder
Fuse Type Fuse Link
Features -
Current Rating (Amps) 4A
Class H
Breaking Capacity @ Rated Voltage 10kA
Approval Agency CE, CSA, UL
Applications Electrical, Industrial

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
ECCN EAR99
HTSUS 8536.10.0040

Frequently Asked Questions(FAQ)

What are the key electrical specifications of the Littelfuse 0LKN004.S fuse link, and how do they impact its use in industrial power protection circuits?
The Littelfuse 0LKN004.S is a 4A, 250 VAC fast-blow fuse link with a breaking capacity of 10kA at rated voltage, making it suitable for protecting sensitive industrial equipment from overcurrent events. Its 50.80mm length and 14.30mm diameter require a compatible cartridge holder, which influences mechanical integration in panel designs. The fast blow response ensures rapid disconnection during transient faults, reducing stress on downstream components. This makes it ideal for applications where timing and reliability are critical, such as motor control centers or power supply backup systems.
How does the Littelfuse 0LKN004.S compare to similar fuse links like the KLNR004.T in terms of performance and application suitability?
While both the 0LKN004.S and KLNR004.T are 4A, 250 VAC fuse links from Littelfuse’s POWR-GARD® LKN series, the 0LKN004.S features a non-standard cartridge package and requires an external holder, whereas the KLNR004.T may offer different mounting flexibility depending on its design variant. The 0LKN004.S has a confirmed 10kA interrupting rating, ensuring robust fault handling in high-energy environments. Application-wise, the choice between them often depends on available space and holder compatibility rather than fundamental electrical differences, though layout constraints in compact industrial enclosures may favor one over the other.
What design considerations should be made when integrating the Littelfuse 0LKN004.S into a PCB or panel assembly?
Since the Littelfuse 0LKN004.S is a cartridge-style fuse link that requires an external holder, PCB-level integration is not direct. Instead, it must be mounted within a compatible fuse holder in a backpanel or subassembly. Engineers must ensure adequate spacing (typically >5mm from conductive surfaces) due to its 250 VAC rating and 50.80mm length. Thermal management is also important—prolonged operation near the 4A limit can generate heat in confined spaces. Proper labeling and access for replacement are essential, particularly in high-reliability industrial systems.
Can the Littelfuse 0LKN004.S be used in DC applications, and if so, what limitations should be considered?
The Littelfuse 0LKN004.S is rated for 250 VAC, and while some AC-rated fuses can handle moderate DC loads, this model’s datasheet does not specify a DC voltage rating. Applying it to DC circuits introduces arc-quenching challenges due to the absence of zero-crossing in current waveforms, which can lead to premature failure or unsafe arcing. Unless explicitly qualified by testing or manufacturer documentation, it is not recommended for DC use beyond low-power, short-duration scenarios. For DC applications, a fuse with dedicated DC ratings should be selected.
What environmental and regulatory conditions must be met for the safe deployment of the Littelfuse 0LKN004.S in global markets?
The Littelfuse 0LKN004.S complies with UL, CSA, and CE approvals, enabling use in North America and European markets. It meets RoHS3 standards, eliminating restricted substances like lead and cadmium, which is mandatory in most commercial and industrial electronics manufacturing. Operating temperature range is typically -40°C to +125°C, but users must verify ambient conditions in sealed enclosures or high-heat environments. Moisture Sensitivity Level (MSL) 1 indicates no special storage requirements, simplifying supply chain logistics.
How does the interrupting rating of 10kA at 250 VAC influence the selection of the Littelfuse 0LKN004.S for overcurrent protection in branch circuits?
A 10kA interrupting capacity means the Littelfuse 0LKN004.S can safely interrupt fault currents up to ten kiloamperes without sustaining damage or causing secondary hazards. This high rating is essential in branch circuits fed by transformers or distribution panels where upstream faults can induce large surge currents. Using this fuse ensures system safety under worst-case short-circuit conditions, especially in industrial settings with long wiring runs or high-impedance faults. However, coordination with upstream protective devices remains necessary to avoid nuisance tripping or inadequate selectivity.
What are the implications of the non-standard cartridge size on installation and replacement procedures for the Littelfuse 0LKN004.S?
The 0.563" diameter and 2.000" length of the Littelfuse 0LKN004.S require precise matching with a compatible fuse holder, which limits interchangeability with standard DIN-rail or panel-mount holders. This increases procurement complexity and inventory management overhead. During maintenance, technicians must verify part number and physical fit before replacement, reducing risk of using incorrect fuses. While this adds a layer of discipline to installation workflows, it also supports intentional design choices that prevent accidental substitution—enhancing safety at the cost of convenience.
How does the fast-blow response time of the Littelfuse 0LKN004.S affect its protection strategy compared to time-delay variants?
The fast-blow characteristic of the Littelfuse 0LKN004.S allows it to respond rapidly to overcurrent conditions, typically within milliseconds of exceeding the 4A threshold. This minimizes energy delivered to protected circuits during faults, which is crucial for safeguarding semiconductor devices or precision instrumentation. Unlike time-delay fuses that tolerate brief inrush currents (e.g., from motors or capacitors), the 0LKN004.S will blow immediately upon sustained overload, making it unsuitable for circuits with high startup surges unless coordinated with soft-start or inrush limiting. This trade-off favors precision over tolerance, aligning with applications requiring strict fault isolation.

Parts with Similar Specifications

The three parts on the right have similar specifications to Littelfuse Inc. 0LKN004.S

Product Attribute 0LKN040.S 0LKN020.S 0LKN006.S 0LKN002.S
Part Number 0LKN040.S 0LKN020.S 0LKN006.S 0LKN002.S
Manufacturer Littelfuse Inc. Littelfuse Inc. Littelfuse Inc. Littelfuse Inc.
Applications - - - -
Breaking Capacity @ Rated Voltage - - - -
Features - - - Simultaneous Sampling
Series - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Approval Agency - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Response Time - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Fuse Type - - - -
Size / Dimension - - - -
Class - - - -
Voltage Rating - AC - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Current Rating (Amps) - - - -

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Evaluation: 10 Articles

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    Sep 22, 2026

    Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.

  • RS48***ieldTech
    Sep 16, 2026

    Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.

  • Logi***b_Chris
    Sep 8, 2026

    Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
    Aug 20, 2026

    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
    Aug 17, 2026

    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

  1. Use your express account for shipment if you have one.
  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
  • QC (Quality Warranty)
  • Payment Support
  • Packaging
  • Certifications & Memberships

QC (Quality Warranty)

Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
This is achieved through our commitment to the continual improvement of our processes, services, and products.


Strict quality inspection builds a solid foundation for electronic component quality.
  1. Visual inspection
  2. Performance testing and reliability verification
  3. Standardized full-process testing
  4. Precise control of every parameter
We eliminate defective components and ensure the stable operation of electronic devices through professional quality standards.
Quality Inspection
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Payment Support

The payment method can be chosen from the methods shown below: Wire Transfer (T/T, Bank Transfer), Western Union, Credit card, PayPal.
  • HKBea
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Stable Delivery, Sincere Partnership — Your Faithful Supply Chain Partner
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Contact us if you have any questions.

Packaging

Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


ESD

Certifications & Memberships

Third-party certified, strict quality control. Our certification
  • ISO 9001: 2015
  • ISO 13485: 2016
  • ISO 14001: 2015
  • ISO 28000: 2007
  • ISO 45001: 2018
  • GB/T 27922-2011
  • SMTA
  • IPC
  • ESD
  • PSMA
Littelfuse Inc.

0LKN004.S

Littelfuse Inc.
98D-0LKN004.S

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