Eaton LPNRK5SPNP Fuse - RK1, 55A, Ni-plated caps
Part Number: LPNRK5SPNP
Quick Summary
LPNRK5SPNP fuse protects large switchgear by delivering current-limiting, time-delay protection for panelboards. Engineers often face nuisance trips and inconsistent protection across feeders, which wastes time and drives maintenance costs. Certification status is provided by the manufacturer; contact Eaton for CE, UL, and other approvals as applicable. Designed for high-availability power distribution, it supports motor control centers and large panelboards with reliable, low-maintenance protection.
Product Information
Extended Description
LPNRK5SPNP Eaton: Eaton Bussmann series LPN-RK fuse, Nickel plated caps, Large distribution switchboards, Power panelboards, Motor control centers, 55 A, Class RK1, Non-indicating, Time delay, Current-limiting, Standard
Product Name
Eaton Bussmann series LPN-RK fuse
Catalog Number
LPNRK5SPNP
UPC
051712608657
Product Length/Depth
0.001 in
Product Height
0.001 in
Product Width
0.001 in
Product Weight
0.15 lb
Warranty
Not Applicable
Compliances
Not Applicable
Certifications
Contact Manufacturer
Amperage Rating
55 A
Fuse type
Time delay Current-limiting
Packaging type
Standard
Class
Class RK1
Fuse indicator
Non-indicating
Special features
Nickel plated caps
LPNRK5SPNP~LOW PEAK NI PLATED CAPS
LPNRK5SPNP~LOW PEAK NI PLATED CAPS
Bussmann series Fuseology
Eaton Specification Sheet - LPNRK5SPNP
Feature: 55 A amperage rating with time-delay, current-limiting characteristics. Business Impact: Reduces arc energy and coordinates protection upstream, cutting nuisance trips and improving system reliability. Application: Ideal for motor control centers and large distribution switchboards where precise protection is critical. Feature: Nickel plated caps for enhanced corrosion resistance. Business Impact: Extends service life in challenging environments and lowers maintenance frequency. Application: Suitable for industrial panels exposed to humidity or mild corrosives. Feature: Class RK1, non-indicating, standard packaging. Business Impact: Simplifies stock management and ensures compatibility with standard RK1 devices. Application: High-volume procurement for Eaton Bussmann series across plant-wide protection schemes. Feature: Easy installation and compatibility with Eaton Bussmann products. Business Impact: Reduces commissioning time and supports fast maintenance swaps. Application: Retrofit projects in legacy switchgear and new builds alike. Feature: Time-delay, current-limiting fuse type. Business Impact: Improves selective coordination and minimizes downtime during faults. Application: Large switchboards and power panelboards requiring controlled fuse operation.
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FAQs
Installation is straightforward in RK1-class panelboards. Confirm the catalog number LPNRK5SPNP, align the fuse with standard RK1 slots, and use compatible mounting hardware. Verify the non-indicating design won't affect your indication scheme, and ensure correct torque on the fuse caps to maintain proper electrical contact and safety during maintenance.
This fuse provides time-delay protection with current-limiting characteristics, allowing selective coordination with upstream protection devices. The 55 A rating supports protection of feeders in motor control centers, reducing nuisance trips and enabling reliable startup sequences in demanding industrial drives.
Nickel-plated caps offer enhanced corrosion resistance, improving life in moderate humidity or mildly corrosive environments. However, verify enclosure IP ratings and operating conditions with Eaton documentation, and consider additional environmental protection for extreme atmospheres or outdoor installations.
Certifications are listed as “Contact Manufacturer” in the provided data. For CE, UL, and other regulatory approvals, consult Eaton’s specification sheets and the datasheet for LPNRK5SPNP. Always confirm current approvals with your procurement or engineering team before qualification in regulated environments.
The fuse minimizes downtime through reduced nuisance tripping, improves protection coordination, and lowers maintenance frequency due to durable nickel-plated caps. In large switchboards and motor control centers, this translates to lower maintenance costs, shorter downtime, and tighter protection alignment with upstream devices, delivering measurable total cost of ownership benefits.