Eaton LPN-RK-3-1/2SP Fuse - Class RK1, 3.5 A
Part Number: LPN-RK-3-1/2SP
Quick Summary
The LPN-RK-3-1/2SP fuse provides motor protection and circuit safeguarding for industrial control panels. In demanding starts and high inrush scenarios, nuisance trips erode productivity and uptime. This device is CE marked and belongs to the Class RK1 family, delivering reliable safety and standard compliance for European and global panels. Its ferrule-end connections simplify field wiring and support quick, repeatable installations in crowded control cabinets. Designed for OEMs and maintenance teams, it helps reduce spare parts inventory and extends equipment life, while the time-delay, dual-element design accommodates motor startup characteristics without compromising protection.
Product Information
Extended Description
LPN-RK-3-1/2SP Eaton: Eaton Bussmann Series Class RK1 fuse, LPN-RK, time-delay, dual-element, current limiting fuse, 3.5 A, non-indicating fuse, interrupting rating of 300 kA at 250 Vac and 100 kA at 125 Vdc
Product Name
Eaton Bussmann series LPN-RK fuse
Catalog Number
LPN-RK-3-1/2SP
UPC
051712538206
Product Length/Depth
2 in
Product Height
0.6 in
Product Width
0.6 in
Product Weight
0.049 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
3.5 A
Interrupt rating
300 kAIC at 250 Vac 100 kAIC at 125 Vdc
Response time
8 sec at 500%
Voltage rating
250 Vac, 125 Vdc
Fuse type
Time delay Current-limiting
Number of elements
Dual
Packaging type
Standard
Class
Class RK1
Connection
Ferrule end x ferrule end
Fuse indicator
Non-indicating
Quantity
10
Special features
Indicating, High in-rush current motor protection
Feature: Time-delay, dual-element, current-limiting design provides controlled responses to startup surges. Business Impact: minimizes nuisance trips and extends fuse life by tolerating brief inrush without sacrificing protection. Application: ideal for motor starters and drives in automated lines. Feature: Precise 3.5 A rating with 250 Vac and 125 Vdc compatibility. Business Impact: protects small control circuits and motors without oversized devices, reducing part count and simplifying stocking. Application: control boxes, panel boards, and logic circuits in manufacturing environments. Feature: High interrupt ratings—300 kAIC at 250 Vac and 100 kAIC at 125 Vdc. Business Impact: superior fault-current interruption safeguarding buses, wiring, and switchgear. Application: main and branch circuits in industrial panels and drive rooms. Feature: Class RK1 with ferrule-end connections and standard packaging. Business Impact: broad compatibility and faster replacement in existing RK1 installations, lowering downtime. Application: retrofit projects and new panel builds across OEM lines. Feature: Non-indicating status with high inrush motor protection as a special feature. Business Impact: reduces maintenance checks while delivering protection for motors with high startup currents. Application: motor-driven equipment like conveyors, pumps, and processing lines.
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FAQs
The LPN-RK-3-1/2SP uses ferrule-end x ferrule-end terminations and a standard 2 inch length with 0.6 inch width and height. This makes it compatible with common RK1 panel wiring practices and simplifies replacement in existing Eaton Bussmann RK1 installations. It is designed for straightforward field wiring, reducing installation time and potential wiring errors while maintaining solid electrical protection.
Key performance specs include a 3.5 A amperage rating, 250 Vac and 125 Vdc voltage ratings, time-delay dual-element construction, and 300 kAIC interrupt rating at 250 Vac with 100 kAIC at 125 Vdc. The 8 second response at 500% provides reliable protection during startup surges, while maintaining conductor and device protection in typical motor control circuits.
Yes. The fuse is CE marked, confirming compliance with applicable European safety directives, and belongs to the Class RK1 family. This combination supports reliable protection in European panels and aligns with global standards for motor protection devices. When used in conjunction with compatible RK1 components, it helps ensure consistent protection across the control enclosure.
Typical applications include motor protection and control in drives, conveyors, pumps, and other industrial equipment with noticeable startup inrush. It is well suited for panel boards and OEM assemblies where compact size, reliable protection, and easy replacement are priorities. Its ferrule-end connections and standard packaging streamline integration into existing installation practices.
Choosing the LPN-RK-3-1/2SP supports higher uptime thanks to a controlled time-delay response that tolerates brief inrush without nuisance trips. The high interrupt ratings protect downstream wiring and switchgear from faults, reducing unplanned downtime. Its standard RK1 compatibility and ferrule-terminals simplify stocking and replacements, lowering maintenance complexity and spare-part costs over the equipment’s life cycle.