Eaton LPNRK4-1/2SPNP Fuse - Class RK1
Part Number: LPNRK4-1/2SPNP
Quick Summary
LPNRK4-1/2SPNP fuse protects power panels by providing time-delay, current-limiting protection for large distribution switchboards and motor control centers. Engineers often struggle with nuisance trips during startup surges and short-term overloads, which this device helps mitigate through its time-delay, current-limiting characteristics. While certifications vary by region, this model lists Certifications as Contact Manufacturer and Compliances as Not Applicable, so it’s essential to confirm CE/UL listings and compatibility with your panel standards with Eaton. By choosing this fuse, electrical teams gain reliable protection, streamlined maintenance, and reduced downtime, while enabling compliant integration into Eaton Bussmann series protection schemes and standard distribution architectures.
Product Information
Extended Description
LPNRK4-1/2SPNP Eaton: Eaton Bussmann series LPN-RK fuse, Nickel plated caps, Large distribution switchboards, Power panelboards, Motor control centers, 4.5 A, Class RK1, Non-indicating, Time delay, Current-limiting, Standard
Product Name
Eaton Bussmann series LPN-RK fuse
Catalog Number
LPNRK4-1/2SPNP
UPC
051712608626
Product Length/Depth
1.4 in
Product Height
1.58 in
Product Width
0.32 in
Product Weight
0.2 lb
Warranty
Not Applicable
Compliances
Not Applicable
Certifications
Contact Manufacturer
Amperage Rating
4.50A
Fuse type
Time delay Current-limiting
Packaging type
Standard
Class
Class RK1
Fuse indicator
Non-indicating
Special features
Nickel plated caps
LPNRK4-1/2SPNP~LPNRK4-1-2SPNP~LOW PEAK NI PLATED CAPS
LPNRK4-1/2SPNP~LPNRK4-1-2SPNP~LOW PEAK NI PLATED CAPS
Bussmann series Fuseology
Eaton Specification Sheet - LPNRK4-1/2SPNP
Feature: Time-delay, current-limiting fuse with nickel-plated caps → Business Impact: Reduces nuisance trips during motor startup and transient overloads, increasing system uptime and equipment lifetime in power distribution and motor control centers. Application: Suitable for large distribution switchboards and power panelboards in industrial facilities. Feature: Class RK1 classification → Business Impact: Aligns with industry protection practices for branch circuits, simplifying panel design and documentation in control rooms and MCCs. Application: Ideal for factory automation and large-scale manufacturing plants. Feature: Non-indicating, standard packaging → Business Impact: Minimal maintenance overhead and easy field identification without complex status indicators, lowering training costs for maintenance crews. Application: Retrofit projects and new installations across electrical protection cabinets. Feature: Nickel-plated caps → Business Impact: Enhanced contact durability and corrosion resistance, improving reliability in harsh environments and extending service intervals. Application: Enclosures with exposure to humidity or variable temperatures. Feature: 4.5 A amperage rating and Time delay, Current-limiting fuse type → Business Impact: Balances fast fault clearance with tolerance for short surges, reducing downstream equipment stress and potential damage. Application: Panelboards and MCCs with mixed-mode loads. Feature: Global compatibility with Bussmann series catalogs → Business Impact: Streamlines procurement and stocking for maintenance teams, ensuring consistent parts across multiple sites. Application: OEMs and integrators managing multi-site rollouts. These features collectively enhance protection accuracy, reduce total cost of ownership, and support compliant, efficient installation in industrial automation environments.
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FAQs
The LPNRK4-1/2SPNP is designed for standard phase-to-phase fuse holders used in large distribution switchboards and MCCs. With a length of 1.4 in, width 0.32 in, and height 1.58 in, it fits most Bussmann-compatible housings. Ensure the holder supports RK1 class fuses and replace only with the same amperage rating of 4.5 A. Use proper torque on caps and verify nickel-plated caps are clean to maintain reliable contact and prevent overheating.
The 4.5 A rating paired with time-delay and current-limiting behavior mitigates brief startup surges common in motors and large loads, while still clearing faults quickly to protect downstream equipment. This balance minimizes nuisance trips during inrush events, extends motor life, and reduces unplanned downtime in manufacturing lines and process equipment.
Yes. The LPNRK4-1/2SPNP is explicitly suitable for motor control centers, large distribution switchboards, and power panelboards. Its RK1 classification and current-limiting characteristics provide reliable protection for circuits with diverse loads, while nickel-plated caps improve durability in industrial environments. Always verify panel compatibility and replacement with the same model to maintain protection integrity.
This product entry lists Certifications as Contact Manufacturer and Compliances as Not Applicable, so you should confirm CE, UL, and regional certifications with Eaton before critical deployments. When planning deployments in regulated environments, request the official certification documents and ensure the part is listed for your panel and regional standards to meet safety and regulatory requirements.
The non-indicating design reduces maintenance complexity, while nickel-plated caps offer improved longevity in challenging environments, contributing to longer service intervals. The time-delay, current-limiting performance lowers nuisance trips and downstream damage, translating to reduced downtime, fewer replacement parts, and overall cost savings over the asset lifecycle when used in appropriate motor and power distribution applications.