Bussmann LIMITRON KLU Series C...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,132.28
Bussmann LIMITRON KLU Series Class L Fast-Acting Fuse, 600V

Bussmann LIMITRON KLU Series Class L Fast-Acting Fuse, 600V

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Model: KLU-800

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

$1,132.28
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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

Connection:
Bolted blade end x bolted blade end
Mounting Method:
Bolt
Fuse Indicator:
Non-indicating
Product Subgroup:
Fuses
Class:
Class L
Interrupt Rating:
200 kAIC at 600 Vac
Product Group:
Circuit Protection
Product Width:
2.5 in
Packaging Type:
Standard
Voltage Rating:
600V
Response Time:
5 sec at 500%
Department:
Electrical
Product Type:
Fast-Acting Fuse
Item Quantity:
1

Bussmann KLU-800 – Frequently Asked Questions

1) What amperage ratings does the Bussmann KLU Class L fuse come in?
Two ampere ratings: 800A (KLU-800) and 1200A (KLU-1200). Both are 600V Class L fast-acting fuses with bolted blade ends on each side, ordered as single fuses rather than multi-packs, so a three-phase switch takes three.
2) Will a KLU fuse drop into my existing Class L fuse holder?
It mounts by bolt, with a bolted blade end at each terminal, which is the standard Class L mounting arrangement. It will seat in a Class L holder or switch rated for the same amperage and at least 600V. Class L fuses are not interchangeable with Class J, T, or RK clip-mounted fuses, so the holder has to be Class L bolt-in prep.
3) Is 200 kAIC enough for a main switchboard with high available fault current?
The KLU interrupts 200,000 amperes at 600 Vac, which is the highest interrupting rating commonly available in Class L and covers virtually any service with a large utility transformer. Because it is current limiting, it also holds peak let-through current and energy below the prospective fault, which is what lets downstream gear be series rated on an available fault study.
4) Can I use a 600V Class L fuse on a 480V or 208V system?
Yes. The 600V rating on the KLU is a maximum system voltage, so it can be applied at 480V, 240V or 208V without issue. What you cannot do is use it above 600 volts. Its 200 kAIC interrupting rating is stated at 600 Vac, which covers typical service-entrance available fault current.
5) Does this fuse have a blown-fuse indicator?
No. The KLU is non-indicating, so there is no window or pop-up pin to show it has opened. Troubleshooting means metering across the fuse or checking continuity with the switch open. If your maintenance crew relies on a visual check in a switchgear lineup, specify an indicating Class L fuse instead.
6) How much room does an 800A Class L fuse need in a switch or panel?
Width is 2.5 inches, and the bolted blade ends add mounting hardware clearance at each terminal. Class L fuses are physically large and dimensionally specific to their amperage band, so confirm the holder centers match the fuse body before ordering, particularly if you are moving between the 800A and 1200A ratings.
7) Are Class L fuses like the KLU a substitute for a Class T or Class J fuse?
No. Class L is a bolt-in, high-amperage class used above 600A on mains, feeders and large transformer circuits; Class J and Class T are clip or bolt styles in lower ampere ranges with different bodies and different let-through curves. Swapping classes changes the mounting and the coordination, so match the class the equipment was listed for. The KLU is Class L only, at 800A and 1200A.
8) What torque and prep do I need to install a bolted-blade Class L fuse?
Installation is bolt-through at both blade ends, so you need the switch or holder's own hardware and the manufacturer's torque value for those terminals. Work it de-energized under NFPA 70E procedures, confirm the holder is rated for Class L at your amperage, seat the blades flat, then verify connections before re-energizing. Loose bolted blades on an 800A or larger circuit are the usual cause of heat damage at the fuse mount.
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
Why buy the Bussmann KLU-800 from ZenSupply?
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