Bussmann LPJ Series Class J Ti...
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Bussmann LPJ Series Class J Time-Delay Fuse, 600V

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Model: LPJ-3SP

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

$90.46
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Bussmann LPJ Series Class J Time-Delay Fuse, 600V

The Bussmann LPJ Series (LPJ-SP, cross-referenced as BUSS LPJ-SP) is a family of Class J time-delay fuses rated for 600V, engineered to deliver dependable overcurrent protection in demanding electrical systems. This product page covers the LPJ Series across its available Ampere Ratings of 2.25 A, 3 A, and 5.6 A, letting electrical contractors and maintenance teams select the exact fuse value required for a given circuit while standardizing on one recognized Class J platform. As part of Bussmann's Class J fuse lineup, every LPJ Series fuse combines a time-delay (TD) response characteristic with the shared 600V voltage rating to help safeguard circuits, equipment, and conductors from damaging fault and overload conditions. Whether specifying the 2.25 A, 3 A, or 5.6 A option, buyers get the same Class J form factor, time-delay performance, and Bussmann manufacturing quality, making it easy to cross-reference and replace fuses consistently across a facility's electrical distribution system.

Key Features

  • Ampere Rating Range: Available in 2.25 A, 3 A, and 5.6 A ratings, allowing precise matching to the connected load and conductor ampacity.
  • Class J Fuse Type: Every LPJ Series fuse is a Class J fuse, a recognized industry fuse category known for current-limiting performance in demanding overcurrent protection applications.
  • Time-Delay (TD) Design: Built with a time-delay response characteristic, the LPJ Series is well suited for circuits that experience temporary inrush conditions without nuisance opening.
  • 600V Voltage Rating: Rated for 600V across all ampere options, the LPJ Series supports overcurrent protection needs on higher-voltage branch circuits, motor circuits, and distribution equipment.
  • Bussmann Manufacturing: Manufactured by Bussmann, a recognized name in circuit protection products for commercial, industrial, and OEM electrical systems.
  • Model Designation LPJ-SP: Also referenced as BUSS LPJ-SP, this designation identifies the fuse family within the Bussmann Class J time-delay lineup for accurate cross-reference and replacement.
  • Class J Form Factor: As a Class J device, every LPJ Series fuse is manufactured to the dimensional and performance characteristics associated with the Class J fuse category, supporting compatibility with Class J fuse holders and disconnects.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Industrial and Commercial Electrical Distribution
  • Motor Circuit and Control Panel Protection
  • Panelboard and Disconnect Switch Fusing
  • Branch Circuit Overcurrent Protection
  • Renovation, Retrofit, and Fuse Replacement Projects

Why Bussmann?

Bussmann is a widely recognized manufacturer of circuit protection products, and the LPJ Series Class J time-delay fuse family reflects that focus with its shared 600V voltage rating and time-delay response design across the 2.25 A, 3 A, and 5.6 A options. For electrical professionals standardizing on Class J protection, the Bussmann LPJ Series offers a reliable, code-recognized option for maintaining consistent overcurrent protection across a facility's electrical distribution system. When specifying or replacing Class J time-delay fuses, the LPJ-SP model designation and BUSS LPJ-SP cross-reference help ensure the correct ampere rating is selected for the application.

Manufacturer Resources

Product Specs

Product Type:
Time-Delay Fuse
Voltage Rating:
600V
Department:
Electrical
Product Subgroup:
Fuses
list_batch:
BUSS-20260919
Amperage Rating:
2.25A - 5.6A
Series:
LPJ-SP
Product Group:
Circuit Protection

Bussmann LPJ-3SP – Frequently Asked Questions

1) Will a Bussmann LPJ-SP fuse fit my existing Class J fuse block or disconnect?
Yes, within the Class J family. The LPJ-SP is built to the dimensional and performance characteristics of the Class J category, so it drops into Class J fuse holders, blocks, and fused disconnects. Class J bodies are physically unique and non-interchangeable with Class RK5, CC, or T holders, so an LPJ will not fit a Class R block and a Class R fuse will not fit a Class J clip.
2) Which Bussmann LPJ part number do I order for 2-1/4 amp, 3 amp, or 5.6 amp?
Three ampere ratings cover the low end of the LPJ line: 2.25 A is LPJ-2-1/4SP, 3 A is LPJ-3SP, and 5.6 A is LPJ-5-6/10SP. All three carry the same 600V rating and the same Class J time-delay characteristic, so the only thing you are choosing is the ampere value.
3) I am replacing fuses in a facility panel labeled LPJ-SP. Is this the same fuse?
If the existing fuse body reads LPJ-SP or BUSS LPJ-SP, this is the same Bussmann Class J time-delay family. Match the ampere rating stamped on the old fuse to the part number: LPJ-2-1/4SP, LPJ-3SP, or LPJ-5-6/10SP for 2.25, 3, and 5.6 amps. Do not increase the ampere rating when replacing. The fuse has to stay matched to the connected load and the conductor ampacity the circuit was designed around.
4) Can I use a 600V Class J fuse on a 480V or 240V circuit?
Yes. The LPJ-SP is rated 600V, which is a maximum voltage rating, so it can be applied on any AC system at or below 600V, including 480V and 240V panels and motor circuits. What you cannot do is apply it above 600V.
5) Why pick a time-delay Class J fuse instead of a fast-acting one for a motor circuit?
Motors and transformers draw a large inrush for a short moment at startup. The LPJ-SP carries a time-delay (TD) characteristic that rides through those temporary inrush conditions without nuisance opening, while still clearing real overloads and faults. A fast-acting fuse on the same circuit tends to open on startup. For control panel and motor branch protection, the time-delay version is the one to spec.
6) What is the lowest amp rating available in the Bussmann LPJ Class J time-delay fuse?
2.25 A is the smallest of the three, ordered as LPJ-2-1/4SP, with 3 A and 5.6 A above it. That 2.25A to 5.6A band suits small control transformers, control panel feeds, and low-current branch circuits where you still want Class J current-limiting protection.
7) Does standardizing a building on Class J fuses make sense for maintenance stock?
It simplifies the stockroom considerably. Because all three LPJ-SP ratings share one Class J form factor and one 600V rating, an MRO crew can hold 2.25 A, 3 A, and 5.6 A on the shelf and know every one of them seats in the same Class J blocks across the distribution gear. Only the ampere value changes between them.
How fast can I get the Bussmann LPJ-3SP 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 LPJ-3SP come with a warranty?
Absolutely. The Bussmann LPJ-3SP 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 LPJ-3SP?
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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