Eaton LPN-RK-4-1/2SP Fuse - Class RK1 Time-Delay 4.5A
Part Number: LPN-RK-4-1/2SP
Quick Summary
The LPN-RK-4-1/2SP fuse from Eaton provides time-delay, dual-element protection for motor drives and control panels. Engineers often battle nuisance tripping during startup when inrush currents spike, leading to unnecessary downtime and component wear. This device carries CE marking and belongs to the Class RK1 family, with RoHS support and proven high interrupt ratings to back up critical installations. The compact form factor and non-indicating design help reduce space in crowded panels while delivering reliable protection, making it a practical choice for industrial automation, motor control centers, and panel builders seeking robust, standardized fusing.
Product Information
Extended Description
LPN-RK-4-1/2SP Eaton: Eaton Bussmann Series Class RK1 fuse, LPN-RK, time-delay, dual-element, current limiting fuse, 4.5 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-4-1/2SP
UPC
051712538220
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
4.5A
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
Non-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 design provides reliable fault clearance while tolerating inrush, reducing nuisance trips and protecting motor windings in pumps, conveyors, and compressor drives. This translates to lower maintenance costs and less unplanned downtime in manufacturing lines, with applications in motor control panels and machine control systems. Feature → Business Impact → Application: Class RK1 designation standardizes replacement parts across fleets, enabling faster procurement and streamlined maintenance programs. Ideal for retrofit projects or new equipment in industrial controls, where compatible Bussmann series fuses simplify stocking and spares planning. Feature → Business Impact → Application: 4.5A rating with 250 VAC and 125 VDC capability, plus 300 kAIC at 250 VAC and 100 kAIC at 125 VDC, delivers precise protection for sensitive loads while ensuring safe disconnection during faults. This improves system reliability in drives, contactors, and control circuits. Feature → Business Impact → Application: Compact 2 in length with 0.56 in width and height eases installation in tight panels and fuse blocks, reducing enclosure footprint and enabling faster wiring harness layouts in automated equipment. Feature → Business Impact → Application: Non-indicating, time-delay, current-limiting performance supports high in-rush motor protection without false alarms, while CE marking confirms compliance for European deployments and global projects that demand consistent standards, improving cross-border project timelines.
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FAQs
The LPN-RK-4-1/2SP is designed for compatibility with standard Class RK1 fuse holders used in Eaton Bussmann series assemblies. Its 2 in length and dual-element, non-indicating design fit common RK1 mounting footprints, simplifying replacement in control panels and motor starter assemblies. For best results, pair it with approved RK1 holders and verify the panel labeling matches the catalog number LPN-RK-4-1/2SP.
Key specifications include a 4.5A amperage rating, 250 VAC and 125 VDC voltage rating, and interrupt ratings of 300 kAIC at 250 VAC and 100 kAIC at 125 VDC. The response time is 8 seconds at 500% overcurrent, making it suitable for motor protection with controlled fault clearance in typical industrial applications.
Yes. It features time-delay, dual-element protection designed to tolerate motor inrush while providing current limiting during faults. Its Class RK1 designation and substantial interrupt ratings support safe, reliable motor protection in control panels, drives, and associated machinery used in manufacturing and processing environments.
This fuse carries CE marking, indicating conformity with relevant European directives. It is part of Eaton’s Bussmann Class RK1 family, which is widely used in industry standards for fusing in control panels and motor circuits. RoHS considerations are supported via Eaton’s compliance tools, aligning the product with modern environmental requirements.
The LPN-RK-4-1/2SP reduces nuisance trips thanks to its time-delay design, protecting motor windings during startups and inrush conditions. Its durable interrupt ratings and compact footprint simplify panel design, lowering installation time and spare parts inventory. Over the equipment lifecycle, this translates to higher uptime, predictable maintenance budgeting, and improved overall return on investment.