Littelfuse KLK Series Current-...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$22.53
Littelfuse KLK Series Current-Limiting Fast-Acting Midget Fuse, 600V/500VDC

Littelfuse KLK Series Current-Limiting Fast-Acting Midget Fuse, 600V/500VDC

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Model: KLK.500

In Stock (leaves warehouse same day if ordered before 3pm ET)

$22.53
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Littelfuse KLK Series Current-Limiting Fast-Acting Midget Fuse, 600V/500VDC

The Littelfuse KLK Series is a line of Midget/5AG fast-acting, current-limiting fuses dual-rated at 600VAC and 500VDC, available in ampere ratings from 0.5A to 10A (0.5A, 3A, 4A, 5A, 8A, 9A, and 10A) to match a wide range of control-circuit loads. Engineered for circuits that do not present high inrush currents, the KLK Series delivers a high interrupting capacity of 100,000A@600VDC, giving these current-limiting fuses the ruggedness to protect sensitive control, lighting, and electronic circuits. Littelfuse designed the KLK Series for use in control circuits, street lighting, H.I.D. lighting, computers, and similar applications where reliable, fast-acting overcurrent protection is required. Manufacturer documentation for the KLK Series includes UL recognition data, multiple ICP interruption test reports, and a CE compliance record, supporting specification in professional and industrial electrical work.

Key Features

  • Ampere Rating Range: Available in 0.5A, 3A, 4A, 5A, 8A, 9A, and 10A ratings for control circuits, street lighting, H.I.D. lighting, computers, and other applications without high inrush currents.
  • Fast-Acting Opening: Fast-Acting (F) opening characteristic delivers a quick response for effective current-limiting protection.
  • Voltage Rating: Dual-rated at 600VAC and 500VDC for broad application compatibility across AC and DC control circuits.
  • Interrupting Rating: 100,000A@600VDC high-interrupting capacity, current-limiting type fuse construction for demanding fault conditions.
  • Package Size: Compact Midget/5AG fuse form factor for space-constrained fuse holders and blocks.
  • Application-Specific Design: Especially suited for control circuits, street lighting, H.I.D. lighting, computers, and similar low-inrush applications where standard fuses may not offer optimal protection.
  • Current-Limiting Construction: Fast-acting, high-interrupting capacity, current-limiting design helps reduce let-through energy during fault conditions.

Certifications & Compliance

  • UL Recognized (File E10480) per manufacturer documentation
  • CE compliance documentation available for the KLK Series
  • Verified via multiple manufacturer ICP interruption test reports

Technical Specifications

  • Series: KLK

Typical Applications

  • Control Circuits
  • Street Lighting Systems
  • H.I.D. Lighting Circuits
  • Computer and Electronic Equipment Protection
  • Commercial and Industrial Electrical Panels
  • Low-Inrush Load Overcurrent Protection

Why Littelfuse?

Littelfuse backs the KLK Series with fast-acting, current-limiting fuse construction rated for a 100,000A@600VDC interrupting capacity, giving specifiers a compact Midget/5AG fuse family spanning 0.5A to 10A for demanding low-inrush circuits such as control panels, street lighting, and H.I.D. lighting systems. Supporting UL recognition and CE compliance documentation, along with independently referenced ICP interruption test reports, reinforces code-compliant, reliable performance for professional electrical installations that depend on precise, fast-acting overcurrent protection.

Product Specs

Series:
KLK
Product Type:
Fast-Acting Fuse
Voltage Rating:
600VAC/500VDC
Amperage Rating:
0.5A - 10A
Listing:
UL Recognized
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Fuses

Littelfuse KLK.500 – Frequently Asked Questions

1) Will a Littelfuse KLK fuse fit a standard midget fuse holder?
Yes. The KLK Series is built in the Midget/5AG form factor, so it drops into standard midget fuse holders and blocks sized for that package. That is the compact 13/32 inch diameter by 1-1/2 inch long body commonly used in control panels where there is no room for a full class fuse.
2) Can I use the KLK fuse on a DC circuit, not just AC?
Yes, it is dual rated at 600VAC and 500VDC, so the same fuse covers AC control circuits and DC circuits up to 500 volts. Stay within those numbers; using it above 500VDC is outside the rating.
3) Which amp ratings does the Littelfuse KLK midget fuse come in?
Seven ratings across the 0.5A to 10A range: 0.5A (KLK.500), 3A (KLK003), 4A (KLK004), 5A (KLK005), 8A (KLK008), 9A (KLK009) and 10A (KLK010). If your panel schedule calls for 1A, 2A, 6A or 7A, those ratings are not among the KLK options here.
4) Is a fast-acting midget fuse the right choice for a motor or transformer circuit?
No. The KLK Series is fast-acting and designed for circuits that do not present high inrush currents, so it will open on the magnetizing or starting surge of a transformer or motor. For those loads you want a time-delay (dual-element) midget fuse instead. Keep the KLK on control circuits, lighting and electronics.
5) What interrupting rating does the KLK fuse have, and is that enough for my panel fault current?
The KLK carries a 100,000A interrupting capacity at 600VDC and is a current-limiting type, which keeps let-through energy down during a fault. On available fault currents up to that figure it will clear safely, which is why it gets specified in industrial control panels.
6) Is the Littelfuse KLK UL listed or UL recognized?
UL Recognized, under file E10480 per Littelfuse documentation. CE compliance documentation also covers the KLK Series. Recognized components are evaluated for use inside end equipment rather than as a standalone listed device, which is the normal path for a panel-mounted midget fuse.
7) How do I order the right Littelfuse KLK part number for a 5 amp control circuit?
Order by amp rating, since that is the only thing that changes across the series. A 5 amp is KLK005; 4 amp is KLK004, 8 amp is KLK008, 9 amp is KLK009. The 0.5 amp uses a decimal part number, KLK.500. Voltage, package and opening characteristic are the same on all of them.
8) What kind of loads is the Littelfuse KLK series actually meant to protect?
Littelfuse aims the KLK at control circuits, street lighting, H.I.D. lighting, computers and similar electronic equipment, plus general commercial and industrial panel work. The common thread is low-inrush loads that need a quick-opening, current-limiting fuse to protect sensitive downstream components.
How fast can I get the Littelfuse KLK.500 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Littelfuse KLK.500 come with a warranty?
Absolutely. The Littelfuse KLK.500 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Littelfuse KLK.500?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Littelfuse KLK.500 from ZenSupply?
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