Bussmann LPS-RK Series Class R...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$34.80
Bussmann LPS-RK Series Class RK1 Dual-Element Time-Delay Fuse

Bussmann LPS-RK Series Class RK1 Dual-Element Time-Delay Fuse

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Model: LPS-RK-175SPI

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

$34.80
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Bussmann LPS-RK Series Class RK1 Dual-Element Time-Delay Fuse

The Bussmann LPS-RK Series Class RK1 Dual-Element Time-Delay Fuse delivers current-limiting overcurrent protection for motor circuits, transformers, and industrial power distribution systems. This Low-Peak fuse series is available in ratings from 3A to 300A, with a 600VAC/300VDC voltage rating and ferrule end connections for compatibility with standard fuse holders. Class RK1 UL Listed construction combines dual-element time-delay technology with current-limiting performance rated up to 300 kAIC at 600V and 100 kAIC at 300VDC, giving electrical professionals dependable protection across a wide span of circuit sizes.

Key Features

  • Amp Rating Range: The LPS-RK series spans 3A through 300A, covering motor, transformer, and distribution circuits of varying sizes within one family.
  • Low-Peak Current Limiting: Reduces let-through energy during fault conditions, minimizing damage to downstream equipment and helping limit arc flash energy.
  • High Interrupt Rating: Rated 300 kAIC at 600V and 100 kAIC at 300VDC for safe operation under high fault-current conditions.
  • Dual-Element Time-Delay Design: Allows temporary, harmless overloads (such as motor inrush) to pass while still responding quickly to short circuits and ground faults.
  • Ferrule End Connections: Ferrule-style terminations seat securely in compatible fuse clips and holders for a reliable electrical connection.
  • Voltage Rating: 600VAC/300VDC rating supports both AC and DC circuit protection, including battery and DC control system applications.
  • Non-Indicating Construction: Standard non-indicating body suited for typical panel and fuse-holder installations.

Certifications & Compliance

  • Class RK1 UL Listed
  • CE Marked

Technical Specifications

  • Voltage Rating: 600 Vac, 300 Vdc
  • Product Type: Current-limiting, time delay

Typical Applications

  • Motor Starter and Motor Circuit Protection
  • Transformer Primary Protection
  • Industrial Control Panels and Automation Equipment
  • Commercial and Industrial Power Distribution Systems
  • Battery Banks and DC Power Distribution
  • HVAC Equipment Protection

Why Bussmann?

Bussmann LPS-RK Series fuses combine Class RK1 UL Listed construction with Low-Peak current-limiting and dual-element time-delay design, giving electrical contractors and industrial facilities dependable, code-compliant overcurrent protection. With current-limiting performance rated to 300 kAIC at 600V and 100 kAIC at 300VDC across a 3A-300A range, the LPS-RK series is built for selective coordination and reliable fault clearing in demanding commercial and industrial electrical systems.

Manufacturer Resources

Product Specs

Class:
Class RK1
Department:
Electrical
Packaging Type:
Standard
Voltage Rating:
600VAC / 300VDC
Number Of Elements:
Dual
Product Type:
Time-Delay Fuse
Series:
LPS-RK
Amperage Rating:
3A - 300A
Connection Type:
Ferrule
Listing:
UL Listed
Standards:
CE Marked
Product Group:
Circuit Protection
Product Subgroup:
Fuses

Bussmann LPS-RK-175SPI – Frequently Asked Questions

1) Will a Bussmann LPS-RK fuse hold up to motor inrush without nuisance blowing?
That is what the dual-element design is for. The LPS-RK carries a time-delay element that lets harmless temporary overloads such as motor starting inrush pass, while the short-circuit element still clears faults and ground faults fast. It is the reason this series gets specified for motor starters, motor branch circuits, transformer primaries, and HVAC equipment rather than a fast-acting fuse.
2) Can I use a Bussmann LPS-RK fuse on a 480V circuit, and does it work on DC?
Yes on both counts. The LPS-RK is rated 600VAC and 300VDC, so it covers 208, 240, 277 and 480V AC systems as well as DC control circuits, battery banks and DC distribution up to 300 volts. Interrupting rating is 300 kAIC at 600V AC and 100 kAIC at 300V DC.
3) Will an LPS-RK fuse fit my existing Class R fuse block or disconnect?
It will if the block is Class R. LPS-RK is a Class RK1 fuse with ferrule end connections, which seat in standard Class R fuse clips and holders. Class R blocks include the rejection feature, so an RK1 fuse drops in but a plain Class H or K fuse will not, which is the point of the rejection design. A Class J, T, or CC holder will not accept it.
4) What is the difference between an LPS-RK and an LPN-RK fuse?
Voltage. The LPS-RK is the 600V version, rated 600VAC / 300VDC. The LPN-RK is the 250V member of the same Low-Peak Class RK1 dual-element time-delay family. Both are current limiting with the same time-delay behavior, so on a 480V system you need the LPS-RK; on a 240V system either will serve and the LPN-RK is the usual pick.
5) Is the LPS-RK a current-limiting fuse for selective coordination and arc flash reduction?
Yes. The Low-Peak LPS-RK is a current-limiting fuse, so it cuts the peak let-through energy during a fault instead of allowing the full available current. That reduces damage to downstream equipment, helps limit incident arc flash energy, and is what makes the series usable for selective coordination studies in commercial and industrial distribution.
6) Is the Bussmann LPS-RK UL Listed and CE marked?
The LPS-RK is UL Listed as a Class RK1 fuse and it is CE marked. Those are the two markings carried on the series, which is what an inspector or a spec on an industrial control panel will typically be looking for.
7) What amp ratings does the Bussmann LPS-RK come in?
Ratings run from single digits up through large feeder sizes. Small control and transformer primary sizes include 3A, 4A, 5A, 6A, 7A, 8A, 9A, 10A, 12A and 15A. Motor and feeder sizes include 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 110, 125, 150, 175, 200, 225, 250, 300, 350, 400, 500 and 600 amps. Pick the rating from your overcurrent calculation, not from the conductor size alone.
8) Do I order a Bussmann LPS-RK by amp rating, and how does the part number change?
Yes, amp rating is the only thing you select, and the catalog number carries it. A 30 amp is LPS-RK-30SP, a 100 amp is LPS-RK-100SPI, a 600 amp is LPS-RK-600SP. Give the amp rating and the matching part number follows, so there is no handing, polarity, or trim to specify. Body style is non-indicating.
9) Can I use an LPS-RK fuse to protect a transformer primary or a control panel?
Yes. Transformer primary protection and industrial control panels are both listed applications for the LPS-RK, along with motor starters, HVAC equipment, commercial and industrial distribution, and DC battery banks. The low-amp end of the series (3A through 15A) is the range usually used for small transformer primaries and control circuits.
How fast can I get the Bussmann LPS-RK-175SPI 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-175SPI come with a warranty?
Absolutely. The Bussmann LPS-RK-175SPI 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-175SPI?
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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