Eaton LPN-RK-4SP Fuse - Class RK1, 4 A, CE Marked
Part Number: LPN-RK-4SP
Quick Summary
The Eaton Bussmann LPN-RK-4SP fuse provides reliable time-delay current-limiting protection for motor starters and control panels. If you’re wrestling with nuisance trips in high inrush loads, this device offers a balanced solution that tolerates brief surges without compromising fault clearance. It carries CE marking and belongs to the Class RK1 family, underscoring alignment with industrial standards and safety requirements. The compact 2 in length with ferrule-end connections fits crowded control cabinets while simplifying replacement. By combining dual elements and a current-limiting design, it reduces conductor damage and improves equipment uptime, delivering measurable savings in maintenance and downtime for industrial automation applications.
Product Information
Extended Description
LPN-RK-4SP Eaton: Eaton Bussmann Series Class RK1 fuse, LPN-RK, time-delay, dual-element, current limiting fuse, 4 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-4SP
UPC
051712538213
EAN
5027590447928
Product Length/Depth
2 in
Product Height
0.56 in
Product Width
0.56 in
Product Weight
0.5 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
4 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
Low Voltage Branch Circuit Fuse Chapter
Low Voltage Branch Circuit Fuse Chapter
RoHS Search Tool
Bussmann series Fuseology
Bussmann series Low-Peak 250 V LPN Class RK1 time-delay fuses,1/10-60 A data sheet no. 1003
Feature: Time-delay, dual-element, current-limiting design. Benefit: Balances inrush tolerance with rapid fault clearing, reducing nuisance trips while protecting wiring and equipment. Application: Motor controllers and automation panels where startup surges are common, improving overall line reliability. Feature: 4 A amperage rating with 300 kAIC interrupt rating at 250 Vac and 100 kAIC at 125 Vdc. Benefit: Strong fault protection for small to medium circuits without overrating the protection device. Application: Small drives, control circuits, and accessory power rails in industrial automation. Feature: Voltage rating of 250 Vac / 125 Vdc. Benefit: Flexible usage across mixed AC/DC control environments, simplifying panel design. Application: Control panels and machine feeds requiring dual-voltage compatibility. Feature: Ferrule end x ferrule end, 2 in length, compact form. Benefit: Easy installation in tight panels and quick replacement during maintenance. Application: Enclosed control cabinets and compact distribution enclosures. Feature: Non-indicating fuse with RK1 classification and CE compliance. Benefit: Clear standardization across equipment sets, straightforward compliance checks, and predictable performance. Application: Building scalable motor protection schemes in automation lines. Feature: Special features indicating capability and high in-rush motor protection. Benefit: Enhanced visibility and protection for high-demand motors, supporting uptime in energy-intensive processes. Application: Industrial motors with brief peak currents and frequent starts.
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FAQs
Yes. The LPN-RK-4SP uses ferrule-end connections and is designed for compatibility with RK1 class fuse installations. Ensure ferrule sizes match the conductors and that panel space accommodates the 2-inch length. This compatibility simplifies replacement and standardizes integration within existing RK1-based protection schemes in automation panels.
The fuse is rated at 4 A with an interrupt rating of 300 kAIC at 250 VAC and 100 kAIC at 125 Vdc. It operates at 250 VAC / 125 Vdc and features time-delay, current-limiting characteristics. Response time is approximately 8 seconds at 500% overload, enabling robust protection while tolerating inrush currents in motors and power circuits.
This fuse is ideal for motor protection, control circuits, and power distribution panels in industrial automation. Its time-delay design accommodates motor inrush while its current-limiting features minimize conductor damage during faults. The compact 2 in form factor helps in crowded control cabinets, improving maintainability and uptime in manufacturing environments.
The LPN-RK-4SP is CE marked, aligning with European safety and performance standards. It is part of Eaton's RK1 Class fuse family, ensuring consistent protection characteristics across RK1 devices. While CE is explicit, verify additional regional requirements for RoHS or local approvals in your facility as needed for complete compliance.
With a robust current-limiting design and dual-element construction, the LPN-RK-4SP offers reliable protection with fewer nuisance trips, reducing downtime and maintenance costs. The 2 in ferrule-end configuration simplifies replacement, while the 4 A rating protects circuits without oversizing protection, contributing to lower energy waste and longer motor life in automated systems.