Bussmann LPN-RK Series Low-Pea...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$84.73
Bussmann LPN-RK Series Low-Peak Dual-Element Time-Delay Fuse, Class RK1

Bussmann LPN-RK Series Low-Peak Dual-Element Time-Delay Fuse, Class RK1

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Model: LPN-RK-35SPI

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

$84.73
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Bussmann LPN-RK Series Low-Peak Dual-Element Time-Delay Fuse, Class RK1

The Bussmann LPN-RK Series Low-Peak fuse is a current-limiting, dual-element time-delay fuse from Eaton, engineered for reliable overcurrent protection in commercial and industrial electrical systems. Rated 250 Vac and 250 Vdc with an interrupting rating of 300 kAIC at 250 Vac and 100 kAIC at 250 Vdc, this Class RK1 fuse features an electrically isolated end cap and a 10-second time delay at 500% of rated current for motor and inrush-load applications. The LPN-RK Series is available in amp ratings from 35A to 250A, including 35A, 40A, 50A, 80A, 110A, 125A, 175A, 200A, and 250A, so you can match the exact rating your circuit requires.

Key Features

  • Amp Rating Range: Available from 35A to 250A (35A, 40A, 50A, 80A, 110A, 125A, 175A, 200A, 250A) to match specific circuit requirements.
  • Dual-Element Time Delay: 10 seconds at 500% of rated current allows motor and inrush loads to start without nuisance opening.
  • Current-Limiting Class RK1: Low-Peak design limits let-through energy to help protect downstream equipment and conductors.
  • High Interrupting Rating: 300 kAIC at 250 Vac and 100 kAIC at 250 Vdc for dependable performance under high fault-current conditions.
  • Voltage Rating: 250 Vac / 250 Vdc for use in standard commercial and industrial distribution systems.
  • Electrically Isolated End Cap: Helps reduce the risk of arcing or ground fault at the fuse terminals.
  • Open Fuse Indicator: Provides a visual cue for quick identification of an opened fuse during troubleshooting.

Technical Specifications

  • Packaging Type: Standard
  • Fuse Indicator: Non-indicating
  • Fuse Class: RK1
  • Time Delay: 10s at 500% of rated current
  • Package Quantity: 10 units
  • Amp Rating Options: 35A, 40A, 50A, 80A, 110A, 125A, 175A, 200A, 250A

Typical Applications

  • Motor Circuit Overcurrent Protection
  • Commercial and Industrial Electrical Panels
  • Feeder and Branch Circuit Protection
  • Switchboard and Equipment Protection
  • Renovation and New Construction Electrical Systems

Why Bussmann?

Bussmann by Eaton is a trusted name in circuit protection, and the LPN-RK Series Low-Peak fuse reflects that reliability with its dual-element time-delay design, high interrupting ratings, and current-limiting Class RK1 construction. Electrical professionals specify Bussmann LPN-RK fuses for dependable, current-limiting overcurrent protection across a wide range of amp ratings, from motor circuits to feeder and branch-circuit applications.

Manufacturer Resources

Product Specs

Class:
Class RK1
Packaging Type:
Standard
Department:
Electrical
Fuse Indicator:
Non-indicating
Product Type:
Time-Delay Fuse
Series:
LPN-RK
Voltage Rating:
250V
Amperage Rating:
35A-250A
Standards:
Class RK1
Product Group:
Circuit Protection
Product Subgroup:
Fuses

Bussmann LPN-RK-35SPI – Frequently Asked Questions

1) Can a Bussmann LPN-RK Low-Peak fuse be used on a 480V circuit?
No. The LPN-RK Series is rated 250 Vac and 250 Vdc, so it belongs on 250V-class systems only. For a 480V circuit you need the 600V Class RK1 equivalent, the Bussmann LPS-RK Low-Peak series, not the LPN-RK.
2) Will the LPN-RK fuse hold on motor starting inrush without nuisance blowing?
That is what the dual-element design is for. The LPN-RK carries a 10 second time delay at 500% of rated current, so a motor's locked-rotor inrush passes without opening the fuse while the short-circuit element still clears a fault fast. It is a standard choice for motor branch circuits in commercial and industrial panels.
3) Can I drop an LPN-RK into a fuse block that currently has Class RK5 fuses?
Yes on dimensions. Class RK1 and RK5 share the same rejection-style R dimensions, so an LPN-RK fits the same clips and blocks as an RK5 such as a Fusetron FRN-R of the same amp rating and 250V class. The difference is performance: the RK1 Low-Peak is current-limiting with lower let-through energy, which is why it is often specified when equipment needs better downstream protection.
4) What amp ratings does the Bussmann LPN-RK Low-Peak fuse come in?
Nine ratings from 35A up to 250A: 35, 40, 50, 80, 110, 125, 175, 200 and 250 amps. Part numbers follow the amp rating, for example LPN-RK-35SPI at 35A and LPN-RK-250SPI at 250A.
5) What is the interrupting rating of the Bussmann Low-Peak LPN-RK?
300,000 A interrupting at 250 Vac and 100,000 A at 250 Vdc. That covers high available fault current at service entrances and switchboards where a standard one-time or renewable fuse would be undersized for the AIC on the drawing.
6) Is the LPN-RK suitable for DC circuits?
Yes, it carries a 250 Vdc rating alongside the 250 Vac rating, with 100 kAIC interrupting on the DC side. Keep DC applications at or below 250 volts.
7) Why choose a Low-Peak RK1 over a fast-acting fuse for a feeder?
A fast-acting fuse clears quickly on any overload, which trips out motor and transformer inrush. The LPN-RK pairs a time-delay element for those inrush loads with a current-limiting short-circuit element, so you can size closer to the load on a feeder or branch circuit and still limit let-through energy to downstream gear. For a purely resistive or electronic load with no inrush, a fast-acting Class RK1 like the Bussmann KTN-R is the better match.
8) Do LPN-RK fuses have a blown-fuse indicator?
The LPN-RK is listed as non-indicating, so there is no mechanical indicator pin to watch for. Check it with a meter or by the open fuse indication described for the series rather than relying on a pop-up flag.
9) How many LPN-RK fuses come in a package?
Standard packaging is 10 units per package. Useful to know if you are stocking a maintenance shelf for a facility rather than buying a single replacement, since most 250V fused switches take three per disconnect.
How fast can I get the Bussmann LPN-RK-35SPI 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 LPN-RK-35SPI come with a warranty?
Absolutely. The Bussmann LPN-RK-35SPI 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 LPN-RK-35SPI?
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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