Bussmann LPJ Series Low-Peak D...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$108.06
Bussmann LPJ Series Low-Peak Dual-Element Class J Time-Delay Fuse, 600V

Bussmann LPJ Series Low-Peak Dual-Element Class J Time-Delay Fuse, 600V

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Model: LPJ-15SPI

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

$108.06
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Bussmann LPJ Series Low-Peak Dual-Element Class J Time-Delay Fuse, 600V

The Bussmann LPJ Series delivers Low-Peak Class J current-limiting fuses engineered for demanding branch-circuit and equipment protection applications, available in ratings from 5A to 500A to match a wide range of overcurrent protection needs. Each dual-element, time-delay fuse in the series is rated 600V (300Vdc) and combines a 10 sec at 500% time-delay characteristic with a high 300 kAIC interrupt rating at 600Vac for dependable performance under fault conditions. Built with bolted blade end x bolted blade end terminals, the LPJ Series is a genuine Bussmann replacement engineered for standard Class J fuse holders and disconnect switches.

Key Features

  • Amp Rating Range: Available from 5A to 500A to cover branch-circuit and equipment protection duty across a wide range of load sizes.
  • Voltage Rating: 600V (300Vdc) rating supports use across standard commercial and industrial distribution systems.
  • Class J Current-Limiting Design: Dual-element construction limits peak let-through current and energy during short-circuit conditions.
  • Time-Delay Characteristic: Rated 10 sec at 500% for dependable operation through motor inrush and other temporary overload currents.
  • High Interrupt Rating: 300 kAIC interrupt rating at 600Vac (100 kAIC at Vdc) supports use in high fault-current systems.
  • Bolted Blade Terminals: Bolted blade end x bolted blade end termination style for a secure, low-resistance connection.
  • Standard Low-Peak Series: Part of the Bussmann Low-Peak Series, built for coordinated selective protection in Class J applications.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Branch-Circuit Overcurrent Protection
  • Motor and Equipment Circuit Protection
  • Industrial Panelboards and Switchboards
  • Disconnect Switches and Fuse Holders
  • Class J Fuse Replacement Programs

Why Bussmann?

Bussmann fuses are engineered for dependable, code-compliant circuit protection in commercial and industrial electrical systems. The Low-Peak Class J design of the LPJ Series delivers dual-element time-delay operation, a 10 sec at 500% time-delay characteristic, and a high 300 kAIC interrupt rating, giving electricians and engineers a trusted, current-limiting solution across the full 5A to 500A range for critical overcurrent protection where reliable, selective coordination matters.

Manufacturer Resources

Product Specs

Number Of Elements:
Dual
Voltage Rating:
600V
Response Time:
10 sec at 500%
Department:
Electrical
Fuse Type:
Time delay
Product Type:
Time-Delay Fuse
Fuse Indicator:
Non-indicating
Class:
Class J
Packaging Type:
Standard
Series:
Low-Peak
Configuration:
Class J
Amperage Rating:
5A - 500A
Product Group:
Circuit Protection
Product Subgroup:
Fuses

Bussmann LPJ-15SPI – Frequently Asked Questions

1) Will a Bussmann LPJ fuse fit a Class R or Class T fuse block?
No. The LPJ Low-Peak fuse is a Class J fuse, and Class J bodies and mounting dimensions are unique to Class J. It drops into standard Class J fuse holders and disconnect switches only. Class R and Class T blocks use different dimensions and rejection features, so an LPJ will not mount in them. If your gear is Class R, you need an R-class fuse instead.
2) Can I use an LPJ Low-Peak fuse on a motor circuit without nuisance blowing on startup?
That is what the dual-element design is for. The LPJ carries a time-delay rating of 10 seconds at 500% of rated current, so it rides through motor inrush and short temporary overloads instead of opening. It still clears a genuine fault fast as a current-limiting Class J fuse.
3) What voltage and fault current can a Bussmann LPJ fuse handle?
Rated 600V AC (300Vdc), with a 300 kAIC interrupting rating at 600Vac and 100 kAIC at DC. That covers standard 208V, 240V, 480V and 600V commercial and industrial distribution, including service points with very high available fault current.
4) Does the Bussmann LPJ fuse have a blown-fuse indicator?
No. The LPJ Low-Peak Class J fuse is non-indicating, so there is no window or pop-up pin to show it has opened. Troubleshooting means metering across the fuse or pulling it. If your maintenance program relies on visual indication, plan on a holder or panel indicator instead.
5) What amp ratings does the Bussmann LPJ Low-Peak Class J fuse come in?
The LPJ series spans 5A to 500A. Ratings include 5A, 6A, 7A, 15A, 60A, 90A, 175A, 225A, 350A, 450A and 500A, ordered by part number such as LPJ-15SPI, LPJ-225SPI or LPJ-500SP. Pick the amp rating your overcurrent device schedule calls for, since Class J holders are sized by amp band.
6) Are the LPJ fuses ferrule type or blade type?
Bolted blade end by bolted blade end on both terminations, which gives a low-resistance mechanical connection in switchgear and bolt-in Class J blocks. If your holder is built for clip-in ferrule fuses, this termination style will not land in it.
7) Why choose a Class J Low-Peak fuse over a standard Class H or K fuse for panel protection?
Class J is current limiting. The LPJ dual-element design cuts peak let-through current and energy during a short circuit, which is what lets you meet equipment short-circuit current ratings and reduce incident energy at the downstream gear. Class H fuses are not current limiting and are typically 10 kAIC, against 300 kAIC at 600Vac for the LPJ. Class J also has its own rejection footprint, so nobody can drop a lower-rated fuse into the holder later.
8) What is the difference between the SP and SPI suffix on LPJ part numbers?
Both are genuine Bussmann Low-Peak Class J fuses with the same 600V rating and 10 sec at 500% time delay. The suffix varies by amp rating in the range offered: 5A, 6A, 90A, 450A and 500A come as LPJ-5SP, LPJ-6SP, LPJ-90SP, LPJ-450SP and LPJ-500SP, while 7A, 15A, 60A, 175A, 225A and 350A come as SPI part numbers such as LPJ-7SPI and LPJ-350SPI. Order by the amp rating you need and take the part number that carries it.
How fast can I get the Bussmann LPJ-15SPI 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-15SPI come with a warranty?
Absolutely. The Bussmann LPJ-15SPI 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-15SPI?
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 LPJ-15SPI from ZenSupply?
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