Eaton LPS-RK-1-1/4SP Fuse - Class RK1 Time-Delay
Part Number: LPS-RK-1-1/4SP
Quick Summary
The Eaton Bussmann Series LPS-RK fuse is a Class RK1 time-delay fuse designed for reliable protection of control panels and motor circuits. This dual-element, current-limiting device helps prevent nuisance trips while safely interrupting faults in demanding industrial environments. With an amperage rating of 1.25 A and high interrupt ratings at both AC and DC supply conditions, it balances selectivity with protection. The product is CE marked and compatible with RoHS standards, ensuring regulatory compliance across many industrial installations. By pairing compact form with strong performance, it delivers a cost-efficient protection solution that reduces downtime and simplifies integration in Eaton Bussmann-equipped panels and downstream equipment. Ideal for new builds or upgrades in automation and process lines.
Product Information
Extended Description
LPS-RK-1-1/4SP Eaton: Eaton Bussmann Series Class RK1 fuse, LPS-RK, time-delay, dual-element, current limiting fuse, 1.25 A, non-indicating fuse, interrupting rating of 300 kA at 600 Vac and 100 kA at 300 Vdc
Product Name
Eaton Bussmann series LPS-RK fuse
Catalog Number
LPS-RK-1-1/4SP
UPC
051712548106
EAN
5027590141543
Product Length/Depth
5 in
Product Height
0.81 in
Product Width
0.81 in
Product Weight
0.17 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
1.25 A
Interrupt rating
100 kAIC at 300 Vdc 300 kAIC at 600 Vac
Response time
10 sec at 500%
Voltage rating
600 Vac, 300 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
Low Voltage Branch Circuit Fuse Chapter
Low Voltage Branch Circuit Fuse Chapter
RoHS Search Tool
Bussmann series Fuseology
Bussmann series Low-Peak 600 V LPS Class RK1 time-delay fuses, up to 600 A data sheet no. 1001
Feature → Business Impact → Application: Time-delay, dual-element design provides selective protection against short circuits and transient inrush, reducing nuisance trips and extending equipment life in CNC machines and conveyors. Application: Use in control panels where motor start-up inrush could trigger false faults; improves uptime and maintenance planning. Feature → Business Impact → Application: Current-limiting action confines fault energy, minimizing conductor damage and downstream component stress; lowers repair costs and downtime in automated packaging lines. Application: Best suited for power distribution in robotic cells and process equipment where reliable fault isolation is critical. Feature → Business Impact → Application: 1.25 A rating with 600 Vac/300 Vdc ratings and 300 kAIC / 100 kAIC interrupt capabilities; enhances protection without over-tripping. Application: Ideal for compact, high-reliability fusing in control circuits. Feature → Business Impact → Application: Ferrule-end connections and standard packaging enable quick field replacement and easy integration with Bussmann series accessories. Application: Reduces maintenance time and ensures consistent performance across Eaton-labeled protection schemes. Feature → Business Impact → Application: CE marking confirms compliance with European safety directives; RoHS alignment supports sustainability and regulatory readiness. Application: Suitable for multinational deployments and cross-border projects in industrial automation.
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FAQs
The LPS-RK-1-1/4SP uses ferrule-end connections designed for standard Bussmann mounting systems. It ships in standard packaging and supports quick field replacement with compatible RK1 holders and Bussmann accessories. Ensure ferrule terminations are properly crimped and seated to maintain full current ratings and interrupt capacity in panel assemblies.
This fuse is rated for 1.25 A with voltage ratings of 600 Vac and 300 Vdc. It provides an interrupt rating of 300 kAIC at 600 Vac and 100 kAIC at 300 Vdc, with a 10-second response time at ~500% overload. It is a time-delay, dual-element, current-limiting fuse suitable for motor and control circuit protection.
Yes. The LPS-RK-1-1/4SP is designed for motor protection in control panels, offering time-delay operation to handle inrush and a high interrupt rating to safely clear faults. Its dual-element construction improves nuisance-tripping resistance, which is especially beneficial in startup-heavy applications like conveyors and robotic cells.
The fuse is CE marked, reflecting compliance with European safety standards. While UL listings are not indicated in the provided data, RoHS compliance tools are available from Eaton to verify materials and finish meet RoHS criteria, helping customers meet environmental and procurement requirements.
Maintenance benefits come from reduced nuisance trips and longer component life due to current-limiting and selective tripping. With standard packaging and ferrule ends, replacement is straightforward, minimizing downtime. The device’s compatibility with Bussmann series accessories also supports scalable protection schemes across a plant, improving overall reliability and return on investment.