Eaton LPN-RK-1-1/4SP Fuse - Class RK1, CE Marked
Part Number: LPN-RK-1-1/4SP
Quick Summary
Eaton LPN-RK-1-1/4SP fuse protects motors and control circuits with time-delay, current-limiting protection for demanding industrial environments. It helps prevent nuisance trips during motor start-up by accommodating brief inrush currents while still interrupting fault currents promptly. This CE-marked RK1 class device combines dual-element construction and a non-indicating option, offering reliable protection in panelboards and motor drives. With a 1.25 A rating and high interrupt ratings on both AC and DC supplies, it supports compact control circuits and machine interfaces without compromising safety. The fuse’s robust physical profile enables easy drop-in replacement in standard carriers, reducing installation time while supporting predictable coordination with upstream protective devices and long-term maintenance efficiency.
Product Information
Extended Description
LPN-RK-1-1/4SP Eaton: Eaton Bussmann Series Class RK1 fuse, LPN-RK, time-delay, dual-element, current limiting fuse, 1.25 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-1-1/4SP
UPC
051712538107
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
1.25 A
Interrupt rating
100 kAIC at 125 Vdc 300 kAIC at 250 Vac
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
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 → Business Impact → Application: Time-delay, dual-element construction provides robust protection for motors and power circuits while tolerating startup surges, reducing nuisance trips and downtime in automation systems. This translates to improved machine uptime, lower maintenance costs, and smoother production runs in conveyors, pumps, and automated conveyors. Application: Ideal for control panels and motor drives in manufacturing lines where short, high inrush currents occur and reliable fault clearing is essential. Feature → Business Impact → Application: Current-limiting capability rapidly isolates faults without excessive energy release, protecting conductors and equipment and extending component life. Application: Suitable for service where wiring is compact and space is at a premium, enabling straightforward retrofits and clean panel layouts. Feature → Business Impact → Application: Class RK1 approval and CE Marking ensure regulatory compliance and safer integration into European-grade installations. Application: Great for OEMs seeking standardized protection across fleets of machines while maintaining easy replacement in customer sites. Feature → Business Impact → Application: Non-indicating versus indicating options simplify diagnostics in dense control panels without compromising protection. Application: Useful where visual cues are required only during maintenance windows and remote monitoring is in place. Feature → Business Impact → Application: 1.25 A rating paired with a 250 Vac/125 Vdc rating and 100 kAIC–300 kAIC interrupt capabilities deliver predictable coordination with upstream devices, enabling scalable protection strategies for motors and drives in industrial environments.
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FAQs
This fuse is 2 inches long with cross-section approximately 0.56 x 0.56 inches and weighs about 0.5 lb, designed for standard fuse holders in control panels. It ships in standard packaging and comes in quantities of 10, simplifying stocking. Use in applications requiring dual-element, time-delay protection to manage motor inrush and fault currents without nuisance trips.
The LPN-RK-1-1/4SP is rated at 1.25 A with voltage ratings of 250 Vac and 125 Vdc. It provides interrupt ratings of 300 kAIC at 250 Vac and 100 kAIC at 125 Vdc, with a response time of 8 seconds at 500%. This makes it suitable for motor protection and high-demand control circuits.
Yes. The LPN-RK-1-1/4SP features time-delay, dual-element construction designed to tolerate motor inrush while still delivering fast fault clearing. Its special features explicitly include high in-rush current motor protection, making it a reliable choice for motor drives and equipment with short startup surges.
This fuse is CE Marked, indicating compliance with European safety standards. The design aligns with Class RK1 protection requirements, supporting consistent, compliant performance across European installations and compatible equipment in control panels and motor protection schemes.
With high interrupt ratings and durable construction, this fuse minimizes downtime from short circuits and extends service intervals for protective devices. The time-delay feature reduces nuisance trips during startup, improving overall machine availability and simplifying maintenance planning in industrial automation environments.