Bussmann LPJ Series Low-Peak C...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$393.69
Bussmann LPJ Series Low-Peak Class J Dual-Element Time-Delay Fuse

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

(No reviews yet) Write a Review

Model: LPJ-100SPI

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

$393.69
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 Series Low-Peak Class J Dual-Element Time-Delay Fuse

The Bussmann LPJ Series Low-Peak Class J Dual-Element Time-Delay Fuse delivers current-limiting overcurrent protection for industrial and commercial power distribution, motor circuits, and control panels. Built to Class J specifications with a 600VAC/300VDC voltage rating, this dual-element design combines time-delay characteristics for motor starting with fast-acting response to short circuits. The LPJ family is available in amp ratings from 1A up to 400A and higher, giving electrical professionals a single Low-Peak platform to standardize protection across a wide range of circuit sizes. Each fuse features bolted blade end connections and a non-indicating, current-limiting design engineered to reduce peak let-through current and energy.

Key Features

  • Amp Rating Range: Available from 1A to 400A and higher across the LPJ family, allowing precise matching of protection to circuit load.
  • Voltage Rating: 600VAC/300VDC rating supports both AC power distribution and DC power systems.
  • Low-Peak Current Limiting Technology: Reduces peak let-through current and energy for enhanced circuit and equipment protection.
  • Dual-Element Construction: Combines time-delay characteristics for motor starting with fast response to short-circuit conditions.
  • Time Delay: 10-second delay at 500% of rated current allows temporary overloads while protecting against sustained overcurrent conditions.
  • Class J Fuse Classification: Meets NEC requirements for current limiting with rejection-type mounting that prevents installation of non-current-limiting fuses.
  • Interrupt Rating: 100 kAIC VDC interrupt rating safely clears high fault currents in DC applications.
  • Bolted Blade End Connections: Non-indicating design with bolted blade ends for secure, reliable mounting in the fuse holder.

Certifications & Compliance

  • CE Marked Certification

Technical Specifications

  • Response Time: 10 sec at 500%
  • Voltage Rating: 600 Vac, 300 Vdc
  • Product Type: Time Delay Fuses

Typical Applications

  • Motor Protection Circuits and Large Motor Starters
  • Power Distribution Systems and Switchgear
  • Transformer Protection, Primary and Secondary
  • Industrial Control Panels and Automation Equipment
  • DC Power Systems, Battery Installations, and Renewable Energy
  • Feeder and Branch Circuit Protection in Panelboards

Why Bussmann?

Bussmann backs the LPJ Series with Low-Peak current-limiting design, dual-element time-delay construction, and CE Marked compliance for demanding industrial and commercial electrical work. Electrical professionals rely on Bussmann Class J fuses across the LPJ amp rating range for consistent overcurrent protection, reduced arc-flash energy, and dependable performance in motor circuits, power distribution equipment, and DC power systems.

Manufacturer Resources

Product Specs

Class:
Class J
Response Time:
10 sec at 500%
Fuse Type:
Time delay
Department:
Electrical
Packaging Type:
Standard
Fuse Indicator:
Non-indicating
Voltage Rating:
600VAC/300VDC
Number Of Elements:
Dual
Product Type:
Time Delay Fuse
Amperage Rating:
1A-400A+
Connection Type:
Bolted Blade
Listing:
CE Marked
Product Group:
Fuses
Product Subgroup:
Time Delay Fuses

Bussmann LPJ-100SPI – Frequently Asked Questions

1) Will a Bussmann LPJ fuse fit a Class R or Class T fuse block?
No. The LPJ is a Class J fuse, and Class J holders use a rejection-style mounting that won't accept other fuse classes, and won't let a non-current-limiting fuse drop into a Class J clip. You need a Class J fuse block or holder sized for the amp rating you're using. The LPJ ends are bolted blade, so the holder has to be the bolt-in style rather than a ferrule clip.
2) Will an LPJ fuse hold in through motor inrush without nuisance blowing?
That's what the dual-element build is for. The LPJ carries a 10 second delay at 500% of rated current, so a motor pulling locked-rotor current on start rides through while the fuse still opens on a sustained overload. The short-circuit element stays fast, so a bolted fault is cleared with current-limiting action rather than waiting out the delay.
3) Can I use the Bussmann LPJ on a DC battery or solar system?
Yes, within its DC rating. The LPJ is rated 600VAC/300VDC, so a battery bank, PV combiner, or DC bus running at or below 300 volts DC is inside the rating. Above 300VDC it is the wrong fuse regardless of the amp draw. The description states a 100 kAIC interrupting rating on DC.
4) What amp ratings does the Bussmann LPJ Low-Peak Class J fuse come in?
Ratings run from 1A up through 600A: 1, 2, 6, 7, 8, 9, 12, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 110, 125, 150, 175, 200, 225, 250, 300, 350, 400, 450, 500 and 600 amps. Small ratings cover control transformers and panel circuits; the 200A and up sizes are feeder and large motor territory. Part numbers follow the amp rating, so a 60 amp is LPJ-60SP and a 250 amp is LPJ-250SPI.
5) Does an LPJ fuse have a blown-fuse indicator?
No. The LPJ is a non-indicating fuse, so there's no pop-up pin or window telling you which one opened. On a three-phase feeder that means troubleshooting with a meter across each fuse rather than reading the fuse itself. If your maintenance crew depends on visual indication, plan on an external blown-fuse indicator or a fuse holder with one built in.
6) Why choose a Class J Low-Peak fuse instead of a standard non-current-limiting fuse for a panel?
Current limiting is the reason. The Low-Peak design cuts the peak let-through current and energy during a fault, which lowers the stress on the downstream gear and reduces arc-flash energy at the equipment. Class J also satisfies NEC current-limiting requirements where the design calls for it, and the rejection mounting keeps someone from later swapping in a fuse that isn't current limiting.
7) Can I standardize one fuse type across motor starters, transformers and feeders in my facility?
That's a fair use of the LPJ family. One Low-Peak Class J platform covers 1A through 600A, so control panels, transformer primaries and secondaries, motor circuits, panelboard feeders and DC systems can all run the same fuse type with only the amp rating changing. For a maintenance stockroom that means one class of spare fuse and one style of holder instead of several.
8) What is the difference between the SP and SPI suffix on Bussmann LPJ part numbers?
Both are LPJ Low-Peak Class J dual-element time-delay fuses and share the same 600VAC/300VDC rating and Class J dimensions. The suffix is a Bussmann packaging and part designation, so which one you get depends on the amp rating: the 125A is LPJ-125SP while the 110A is LPJ-110SPI. When you're replacing an existing fuse, match the amp rating first and order the LPJ number that carries it.
How fast can I get the Bussmann LPJ-100SPI 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-100SPI come with a warranty?
Absolutely. The Bussmann LPJ-100SPI 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-100SPI?
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-100SPI 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.
!