Bussmann LPS-RK Series Low-Pea...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$81.74
Bussmann LPS-RK Series Low-Peak Time-Delay Fuse, Class RK1

Bussmann LPS-RK Series Low-Peak Time-Delay Fuse, Class RK1

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Model: LPS-RK-30SPI

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

$81.74
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Bussmann LPS-RK Series Low-Peak Time-Delay Fuse, Class RK1

The Bussmann LPS-RK Series Low-Peak fuse is a Class RK1, non-indicating, time-delay, current-limiting fuse engineered for large distribution switchboards, power panelboards, and motor control centers. Rated 600V / 300 Vdc with an interrupting rating of 100 kAIC (Vdc) and up to 300 kAIC at 600 V, this tin-plated fuse is available across 22 amp ratings from 5.6A to 400A, letting electricians match protection precisely to circuit and equipment needs. The time-delay design rides out motor-starting inrush current while the current-limiting construction restricts let-through energy during a fault, helping protect downstream equipment, conductors, and connected loads from damage. As a non-indicating fuse, it is intended for installations where visual open-fuse indication is not required, keeping the fuse holder or block simple and compact.

Key Features

  • Amp Rating Range: Available in 22 ratings from 5.6A to 400A, sized to match branch-circuit and equipment protection requirements.
  • Class RK1 Current-Limiting: Current-limiting design restricts let-through energy during short-circuit conditions for tighter equipment protection.
  • Time-Delay, Non-Indicating Operation: Time-delay characteristic rides out motor-starting and transformer inrush without nuisance opening.
  • Voltage Rating: 600V / 300 Vdc for use across large distribution switchboards, power panelboards, and motor control centers.
  • Interrupting Rating: 100 kAIC (Vdc) and up to 300 kAIC at 600 V for high fault-current withstand.
  • Tin-Plated Construction: Tin-plated fuse elements support reliable long-term contact and corrosion resistance.
  • Non-Indicating Design: Non-indicating construction suits standard fuse blocks and holders where blown-fuse indication is not needed.

Technical Specifications

  • Class: Class RK1
  • Voltage Rating: 600 Vac, 300 Vdc
  • Product Type: Time Delay Fuses

Typical Applications

  • Large Distribution Switchboards
  • Power Panelboards
  • Motor Control Centers
  • Commercial and Industrial Electrical Systems
  • Short-Circuit and Overcurrent Protection

Why Bussmann?

Bussmann by Eaton is a recognized name in circuit protection, and the LPS-RK Series Low-Peak fuse reflects that reputation with Class RK1 current-limiting, time-delay performance built for demanding industrial and commercial power systems. Tin-plated construction and a 600V / 300 Vdc rating with up to 300 kAIC interrupting capacity combine reliable long-term performance with high fault-current withstand, giving electrical professionals a dependable choice for switchboard, panelboard, and motor control center protection across the full 5.6A-400A range.

Product Specs

Class:
Class RK1
Voltage Rating:
600VAC / 300VDC
Department:
Electrical
Product Type:
Time-Delay Fuse
Series:
LPS-RK
Amperage Rating:
5.6A - 400A
Product Finish:
Tin-Plated
Standards:
UL Class RK1
Product Group:
Circuit Protection
Product Subgroup:
Fuses

Bussmann LPS-RK-30SPI – Frequently Asked Questions

1) Will a Bussmann LPS-RK fuse fit a Class R fuse block, and can I use it on a 240V circuit?
The LPS-RK is a Class RK1 fuse rated 600VAC / 300VDC, so it mounts in Class R rejection blocks and holders sized for 600V Class R fuses. Because a fuse's voltage rating is a maximum, it can be applied on lower-voltage AC systems such as 480V or 240V. What it will not do is drop into a 250V Class R block: the 600V body dimensions are longer than the 250V RK equivalents, so the block has to be a 600V Class R.
2) Can I use an LPS-RK to protect a motor circuit without nuisance blowing on startup?
Yes, that's what the time-delay element is for. The LPS-RK rides out motor-starting and transformer inrush current instead of opening on it, while still limiting let-through energy on a genuine short circuit. It is used in motor control centers for exactly this reason. Ratings run from 5.6A to 400A, so the fuse can be sized to the motor nameplate and the applicable overcurrent rules rather than oversized to survive inrush.
3) What fault current can a Bussmann LPS-RK interrupt?
Interrupting rating is up to 300 kAIC at 600V, and 100 kAIC on DC. That covers service-entrance and switchboard locations where available fault current is high, which is why the series shows up in large distribution switchboards and power panelboards. The current-limiting construction also cuts peak let-through energy, which is what downstream series-rated equipment depends on.
4) Is an RK1 fuse interchangeable with an RK5 fuse of the same amp rating?
They share the same Class R body and mounting, so an RK1 like the LPS-RK will physically go where an RK5 sits at the same voltage and amp rating. The difference is let-through energy: RK1 is the tighter current-limiting class, RK5 is looser. Going from RK5 up to the LPS-RK gives better downstream protection; going the other direction can break a series rating or an equipment protection scheme that was calculated on RK1 let-through values.
5) Is the Bussmann LPS-RK a UL listed Class R fuse for a spec that calls out Class RK1?
Yes. The series is a UL Class RK1 fuse, so it satisfies a drawing or panel schedule that specifies Class RK1 at 600V. For standardizing a facility, the whole 5.6A to 400A range is the same class, voltage and time-delay characteristic, so one fuse family covers the switchboard, panelboard and MCC positions.
6) Does the LPS-RK show when it has blown?
No. The LPS-RK is a non-indicating fuse, so there is no pop-up or visual open-fuse indicator. You confirm an open element with a meter or continuity check. If the job requires blown-fuse indication at the block, this series is the wrong choice; it is built for installations where standard blocks and holders without indication are acceptable.
7) What amp ratings does the Bussmann LPS-RK come in?
Twenty-two ratings, 5.6A through 400A: 5.6, 6.25, 7, 8, 10, 12, 15, 20, 25, 30, 35, 40, 50, 60, 80, 125, 150, 200, 225, 300, 350 and 400 amps. Part numbers follow the rating, so 30A is LPS-RK-30SPI and 200A is LPS-RK-200SPI. The fractional low-end ratings are useful for control transformer and small motor protection where a 15A fuse would be far too coarse.
8) Can I use the LPS-RK on a DC bus or battery system?
It carries a 300VDC rating with a 100 kAIC DC interrupting rating, so it can be applied on DC systems at or below 300 volts. Above that, this is not the right fuse. Note the DC interrupting rating is lower than the 300 kAIC available at 600VAC, so size the application against the DC figure.
9) Are the LPS-RK terminals plated for use in damp or industrial environments?
The fuse is tin-plated, which helps maintain contact integrity in the clips over time and resists corrosion on the ferrules and blades. That matters most in humid plant rooms and outdoor-rated switchboards, where a bare-metal ferrule can build resistance in the clip and run hot.
How fast can I get the Bussmann LPS-RK-30SPI 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 LPS-RK-30SPI come with a warranty?
Absolutely. The Bussmann LPS-RK-30SPI 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 LPS-RK-30SPI?
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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