Eaton LPN-RK-40SP Fuse - Class RK1, 40A, 300 kAIC
Part Number: LPN-RK-40SP
Quick Summary
The Eaton LPN-RK-40SP fuse provides time-delay protection for motor and power circuits in industrial equipment. Nuisance trips during motor startup and high inrush can drive maintenance costs and unplanned downtime. The design carries CE marking for European safety compliance and uses RK1-class protection combined with a 40 A rating and a 300 kAIC interrupt rating. Built for panel builders and machinery integrators, it supports ferrule-end connections, standard 3 inch length, and easy field replacement in control panels. This combination delivers measurable business value by reducing downtime, protecting wiring, and enabling faster service in demanding environments. With the Bussmann series lineage, installers benefit from broad compatibility with common fuse blocks and standardized replacement parts.
Product Information
Extended Description
LPN-RK-40SP Eaton: Eaton Bussmann Series Class RK1 fuse, LPN-RK, time-delay, dual-element, current limiting fuse, 40 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-40SP
UPC
051712538381
Product Length/Depth
3 in
Product Height
0.81 in
Product Width
0.81 in
Product Weight
0.5 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
40 A
Interrupt rating
300 kAIC at 250 Vac 100 kAIC at 125 Vdc
Response time
10 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
Time-delay, dual-element operation provides controlled inrush handling while maintaining fast fault interruption. Business impact: reduces nuisance trips during motor startup, extending motor life and minimizing unplanned downtime. Application: ideal for motors, drives, conveyors, and other high-inrush loads in industrial panels. Current-limiting and time-delay features limit fault energy and protect wiring under short-circuits. Business impact: protects cables and components, helping to meet code requirements and reduce replacement costs. Application: machine tools, HVAC, and process automation where surge events occur. 40 A rating with 250 VAC or 125 VDC voltage rating supports common industrial power distributions. Business impact: simplifies panel design and stocking by aligning with standard supply voltages. Application: control circuits, motor starters, and power distribution blocks. Ferrule-end connections and a standard 3 inch body length enable quick installation in existing fuse blocks and plug-in holders. Business impact: lowers labor time during panel commissioning and maintenance. Application: retrofit projects and OEM equipment with limited space. Class RK1 with CE marking and a 300 kAIC interrupt rating at 250 VAC provides robust protection for high-energy systems. Business impact: compliant protection with European standards, higher fault energy capability, and dependable performance. Application: heavy electrical protection in machinery, pumps, and automation controllers.
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FAQs
Install the LPN-RK-40SP in standard fuse blocks or holders designed for ferrule-end connections. The fuse length is 3 inches with ferrule-end terminations, so align the ferrules with the holder slots and secure with the appropriate mounting hardware. Ensure the panel is de-energized during replacement and verify the supply voltage matches 250 VAC or 125 VDC ratings.
The fuse is rated for 40 A with voltage ratings of 250 VAC and 125 VDC. It provides a 300 kAIC interrupt rating at 250 VAC and 100 kAIC at 125 VDC, with a time-delay response of about 10 seconds at 500% overcurrent. This combination supports reliable protection for motors and drive circuits while tolerating brief inrush events.
Yes. The time-delay, dual-element design together with current-limiting characteristics makes it well suited for motors, pumps, and conveyors, where startup inrush is common. The 40 A rating and high interrupt ratings protect conductors and components without nuisance tripping, improving uptime in material handling and process automation applications.
Yes, the LPN-RK-40SP is CE marked, indicating compliance with European safety standards. Its RK1 class design aligns with the Bussmann series protection philosophy, providing a familiar and widely accepted protection solution for European control panels and machinery.
By reducing nuisance trips and protecting against short-circuit energy with a 300 kAIC rating, downtime is minimized and component life is extended. The ferrule-end, 3 in form factor supports quick maintenance and replacement in existing panels, lowering labor costs and increasing overall equipment reliability in manufacturing lines.