Bussmann LIMITRON Fast Acting ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$2,590.70
$1,061.51
Bussmann KLU-800 Eaton series KLU fuse, LIMITRON Fast-acting fuse, 800 A, Class L, Non-indicating, Bolted blade end x bolted blade end, 5 sec at 500%, 200 kAIC at 600 Vac, Bolt, Standard, 1, 600 V

Bussmann LIMITRON Fast Acting Fuse KLU Series 800A 600V Class L Bolted Blade End

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Model: KLU-800
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$2,590.70
$1,061.51
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Bussmann LIMITRON Fast Acting Fuse KLU Series 800A 600V Class L Bolted Blade End

Heavy-Duty Current Limiting Electrical Protection

The Bussmann LIMITRON Fast Acting Fuse KLU Series delivers superior electrical protection and circuit safety for high-amperage industrial applications. This Class L fast-acting fuse features current limiting technology designed for electrical contractors, industrial facilities, and commercial installations, providing the reliable overcurrent protection and industry-leading safety that electrical professionals demand for 800A 600V circuits.

Professional Features & Benefits

Current Limiting Protection

  • 800A Current Rating - Handles high-amperage loads with precise overcurrent protection and fault clearing capability
  • 200 kAIC Interrupt Rating - Safely interrupts fault currents up to 200,000 amperes at 600VAC for maximum electrical safety
  • Fast Acting Response - 5 second response time at 500% rated current provides rapid fault clearing for sensitive equipment protection
  • Current Limiting Technology - Reduces let-through energy and peak fault current to minimize electrical system damage

Safety & Standards Compliance

  • Class L Certification - UL listed Class L fuse meets NEC requirements for high-amperage electrical protection applications
  • CE Marked Compliance - Meets international electrical safety standards for global industrial installations
  • Non-Indicating Design - Professional-grade construction without visual indication for standard electrical panel applications

Technical Specifications

800A amperage rating, 600V voltage rating, 200 kAIC interrupt rating at 600VAC, Class L fuse classification, bolted blade end connection, 5 second response time at 500% rated current, dimensions 2.5" H x 2.5" W x 8.63" L, weight 3.75 lbs, non-indicating design, fast-acting element type, standard packaging.

Installation & Setup

  1. Verify electrical system is de-energized and follow NFPA 70E safety procedures before installation
  2. Confirm fuse holder is rated for Class L fuses and 800A current capacity
  3. Install fuse with bolted blade ends properly seated and torqued to manufacturer specifications
  4. Verify proper fuse orientation and secure mounting in electrical panel or switchgear
  5. Test electrical connections and verify system grounding before energizing circuit
  6. Document installation with amperage rating and interrupt capacity for maintenance records

Professional Applications

Ideal for:

  • Industrial Motor Protection - Large motor starters, variable frequency drives, and high-horsepower equipment protection
  • Power Distribution Systems - Main electrical panels, switchgear, and distribution boards requiring high-amperage protection
  • Transformer Circuits - Primary and secondary protection for industrial and commercial transformers
  • Commercial Buildings - Shopping centers, office buildings, and institutional facilities with high electrical loads
  • Manufacturing Facilities - Production equipment, conveyor systems, and industrial machinery protection
  • Data Centers - UPS systems, power distribution units, and critical electrical infrastructure
  • Electrical Panels - Main breaker panels, load centers, and electrical distribution equipment
  • Industrial Machinery - Heavy equipment, processing systems, and automated manufacturing lines

LIMITRON Technology Advantage

Bussmann LIMITRON technology provides superior current limiting performance through advanced arc suppression and fault clearing capability. The fast-acting element design ensures rapid response to overcurrent conditions while the current limiting feature reduces let-through energy, protecting downstream electrical equipment and minimizing system damage during fault conditions.

Why Choose Bussmann Quality?

Bussmann demonstrates unwavering commitment to UL listing, NEC compliance, and reliable overcurrent protection for professional electrical installations. Our Class L fuses deliver industry-leading electrical safety, precise fault clearing, and dependable circuit protection that electrical contractors and facility managers trust for critical high-amperage applications requiring maximum electrical system reliability.

Manufacturer Resources

Product Specs

Amperage Rating:
800 A
Class:
Class L
Compliances:
CE Marked
Connection:
Bolted blade end x bolted blade end
Fuse Indicator:
Non-indicating
Interrupt Rating:
200 kAIC at 600 Vac
Mounting Method:
Bolt
Packaging Type:
Standard
Product Height:
2.5 in
Product Length Depth:
8.63 in
Product Weight:
3.75 lb
Product Width:
2.5 in
Response Time:
5 sec at 500%
Voltage Rating:
600 V
Department:
Electrical
Item Quantity:
1
Product Type:
Fuse
Product Group:
Fuses
Product Subgroup:
Other Fuses

Bussmann KLU-800 – Frequently Asked Questions

1) Will the Bussmann KLU-800 fit a standard 800A Class L fuse block?
The KLU-800 is a Class L fuse with bolted blade ends on both sides, so it mounts by bolting into an 800A Class L holder or switch. Body dimensions are 2.5 x 2.5 x 8.63 inches and it weighs 3.75 lb, so plan for the bolt spacing and clearance your Class L gear is built around. It will not drop into a clip-style Class J, T, or R holder.
2) Can I use an 800A 600V Class L fuse on a 480V or 240V system?
Yes. The KLU-800 carries a 600 V rating, which is a maximum, so it can be applied on any AC system at or below 600 V, including 480Y/277 and 208/240. What you cannot do is apply it above 600 V. Its 200 kAIC interrupting rating is stated at 600 Vac.
3) Is 200 kAIC enough for my service entrance available fault current?
200,000 A at 600 Vac is the top of the standard interrupting range for a Class L fuse, so the KLU-800 covers any available fault current up to that figure at the point of installation. Run your short circuit study number against it; if your calculated available fault current at the switch is below 200 kA, this fuse is rated for the duty.
4) Is a fast-acting Class L fuse the right choice for a large motor feeder, or do I need time-delay?
The KLU LIMITRON element is fast acting, with a 5 second clearing time at 500 percent of rated current. That is fine for feeders, switchgear mains, and transformer or UPS circuits where inrush is modest. If you are protecting a large across-the-line motor whose locked rotor inrush sits near 600 percent for several seconds, a time-delay Class L fuse is the better fit, since a fast-acting element sized to the running load can open on starting current.
5) Does this Bussmann fuse have a blown fuse indicator?
No. The KLU-800 is a non-indicating fuse, so there is no pop-up pin or window to show it has opened. On an 800A main you will be confirming continuity with a meter or relying on switch-mounted indication in the gear itself. If your maintenance procedure depends on visual indication, specify an indicating Class L fuse instead.
6) What exactly am I ordering, one fuse or a set of three?
One fuse per order. The KLU-800 ships as a single piece in standard packaging, so a three-phase switch needs three of them. Order by the manufacturer part number KLU-800.
7) Why use a current limiting Class L fuse instead of just relying on the breaker?
Current limiting means the fuse clears within the first quarter cycle of a high fault and cuts the peak let-through current and energy that reaches downstream gear. On a 600 V system with heavy available fault current, that let-through reduction is what lets you series-rate or protect equipment with a lower withstand, and it lowers incident energy at the panel. The KLU-800 does that at 800 A with a 200 kAIC interrupting rating.
8) Does this fuse meet European requirements for an exported control panel?
The KLU-800 is CE Marked, which covers the declaration needed for equipment going into the European market. Note the 600 V rating is an AC rating suited to North American 480 and 600 V systems; check that your panel's system voltage is within it.
9) How much does an 800A Class L fuse weigh, and can one person change it out?
3.75 lb for the KLU-800, in a body 8.63 inches long by 2.5 by 2.5 inches. It is a one-hand lift, but both ends are bolted blade, so a changeout means de-energizing, unbolting both terminals, and torquing the new fuse back down rather than pulling and snapping it into clips.
How fast can I get the Bussmann KLU-800 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 Bussmann KLU-800 come with a warranty?
Absolutely. The Bussmann KLU-800 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 Bussmann KLU-800?
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
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