Bussmann LPJ Low-Peak Class J ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$34.12
Bussmann LPJ Low-Peak Class J Dual-Element Time-Delay Fuse

Bussmann LPJ Low-Peak Class J Dual-Element Time-Delay Fuse

(No reviews yet) Write a Review

Model: LPJ-20SP

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

$34.12
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

Bussmann LPJ Low-Peak Class J Dual-Element Time-Delay Fuse

The Bussmann LPJ Low-Peak Class J fuse family delivers dual-element, time-delay overcurrent protection for demanding electrical systems. This family is available in amperage ratings from 20A to 40A, all sharing a dual voltage rating of 600VAC/300VDC and a non-rejection Class J body style. The dual-element design combines fast-acting response to short-circuit currents with time-delay characteristics that ride through motor starting inrush and temporary overload conditions without nuisance opening. Low-Peak LPJ-series fuses are widely specified for motor circuits, feeders, and branch circuits where reliable, current-limiting protection is required across both AC and DC power distribution systems. Whatever amperage you select from the 20A-40A range, you get the same Class J current-limiting performance and dual-element construction that Bussmann Low-Peak fuses are known for.

Key Features

  • Amperage Range: Available in 20A, 35A, and 40A ratings to match a variety of circuit overcurrent thresholds.
  • Voltage Rating: Rated 600VAC/300VDC for use across both AC and DC power distribution systems.
  • Class J Construction: Low-Peak Class J design delivers current-limiting performance, reducing peak let-through current and energy during fault conditions.
  • Dual-Element Time-Delay: Combines fast response to short-circuit currents with time-delay characteristics that ride through motor starting and temporary overload currents without nuisance opening.
  • Non-Rejection Body Style: Non-rejection configuration for compatibility with standard fuse holders and fuse clips.
  • Current-Limiting Performance: Limits let-through current and energy to help protect downstream conductors, components, and connected equipment across the entire LPJ amperage range.
  • Series: Part of the Bussmann Low-Peak (LPJ) product line engineered for high-performance current-limiting protection.
  • Application Versatility: Suited for motor branch circuits, feeders, and other circuits requiring Low-Peak current-limiting protection at 20A, 35A, or 40A.

Technical Specifications

  • Amperage Rating: 20A - 40A
  • Voltage Rating: 600VAC/300VDC

Typical Applications

  • Motor Branch Circuit Protection
  • Industrial and Commercial Electrical Panels
  • Feeder and Branch Circuit Overcurrent Protection
  • Equipment Requiring Low-Peak Current-Limiting Fuses
  • AC and DC Power Distribution Systems
  • Feeder Circuits Requiring Low-Peak Current-Limiting Protection

Why Bussmann?

Bussmann Low-Peak fuses are engineered for dependable, code-compliant overcurrent protection in professional electrical installations. Across the entire 20A-40A LPJ range, this Low-Peak Class J fuse family's current-limiting design and dual-element time-delay construction help minimize nuisance fuse opening while safeguarding circuits and connected equipment. Choose Bussmann Low-Peak fuses for consistent, reliable overcurrent protection performance regardless of the amperage rating you select. Backed by Bussmann's reputation for dependable circuit protection, this Low-Peak Class J fuse family helps electrical professionals meet demanding application requirements with confidence.

Manufacturer Resources

Product Specs

Product Type:
Time-Delay Fuse
Voltage Rating:
600VAC/300VDC
Series:
LPJ
Standards:
Class J
Configuration:
Non-Rejection
Department:
Electrical
Product Subgroup:
Fuses
list_batch:
BUSS-20260919
Product Group:
Circuit Protection

Bussmann LPJ-20SP – Frequently Asked Questions

1) Will a Bussmann LPJ Class J fuse fit my existing Class J fuse block?
Yes, provided the block is sized for the same amperage band. The LPJ is a Class J fuse in a non-rejection body style, so it drops into standard Class J holders and fuse clips. Class J dimensions are amp-band specific, so a block built for the 1-30A band takes the LPJ-20SP, while the 35A and 40A ratings fall in the next band up.
2) Can I use the LPJ fuse on a DC circuit, or is it AC only?
Both. The LPJ Low-Peak Class J fuse carries a dual rating of 600VAC and 300VDC, so it can be applied in AC distribution up to 600 volts and in DC systems up to 300 volts. Do not apply it above 300V on the DC side, the AC rating does not carry over.
3) Will an LPJ fuse nuisance-blow on motor starting inrush?
That is what the dual-element design is for. The LPJ combines a fast-acting short-circuit element with a time-delay element that rides through motor starting inrush and temporary overloads without opening, while still clearing a genuine fault quickly. It is a common choice for motor branch circuits, feeders, and branch circuit overcurrent protection.
4) Is a Class J fuse interchangeable with a Class R or Class H fuse of the same amperage?
No. Class J, Class R and Class H fuses have different body lengths and ferrule dimensions, and Class J blocks are built so only a Class J fuse seats. Replacing a Class J LPJ with a Class R of the same amperage is not a direct swap and loses the Class J interrupting and current-limiting characteristics the panel was engineered around. Match class to class.
5) What amp ratings does the Bussmann LPJ Low-Peak fuse come in?
Three ratings: 20 amp (LPJ-20SP), 35 amp (LPJ-35SP) and 40 amp (LPJ-40SP). All three share the same 600VAC/300VDC rating and the same dual-element time-delay construction, so stepping between them is purely a question of the circuit's overcurrent threshold.
6) What does current-limiting mean on a Class J fuse, and why would I spec one over a non-current-limiting fuse?
A current-limiting fuse opens before the fault current reaches its full prospective peak, cutting both the peak let-through current and the energy the downstream conductors, contactors and equipment have to absorb. The LPJ Low-Peak Class J is built for that, which is why it gets specified where equipment short-circuit current ratings and component protection matter. A standard non-current-limiting fuse or breaker will clear the fault but lets far more energy through on the way.
7) Which LPJ part number do I order for a 40 amp feeder at 480V?
LPJ-40SP. The 40 amp Low-Peak Class J is rated 600VAC, so 480V three-phase feeder service is well inside the rating, and the dual-element time-delay characteristic suits feeder and motor loads. Order by the SP part number so you get the single-pack Low-Peak unit rather than a different packaging code.
How fast can I get the Bussmann LPJ-20SP 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-20SP come with a warranty?
Absolutely. The Bussmann LPJ-20SP 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-20SP?
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-20SP from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
!