Eaton LPS-RK-4-1/2SP Fuse - Class RK1, CE Marked

Part Number: LPS-RK-4-1/2SP
Manufacturer
Eaton
Part number
LPS-RK-4-1/2SP

Quick Summary

The Eaton LPS-RK-4-1/2SP fuse is a time-delay, dual-element protection device designed for electrical panels and motor circuits. Engineers often struggle with nuisance trips when startup surges or mixed loads push fuses beyond their limits. The fuse is CE marked and built to Class RK1 standards, with a time-delay, dual-element design for reliable protection. With a 4.5 A rating and high interrupt capability, it supports both AC and DC applications while helping minimize downtime, improve system reliability, and simplify procurement for control cabinets and feeder circuits.

Product Information

Extended Description

LPS-RK-4-1/2SP Eaton: Eaton Bussmann Series Class RK1 fuse, LPS-RK, time-delay, dual-element, current limiting fuse, 4.5 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-4-1/2SP
UPC
051712548229
Product Length/Depth
5 in
Product Height
0.81 in
Product Width
0.81 in
Product Weight
1.6 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
4.5A
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
Special features
Electrically isolated end cap
Feature → Time-delay, dual-element construction enables controlled response to startup surges, reducing nuisance trips and extending motor life. Application → Ideal for motor feeders and power supplies in automation lines, where inrush currents are common and continuity matters. Benefit → Improves equipment uptime and protects downstream components, delivering tangible total cost of ownership savings. Feature → Current-limiting capability with 300 kAIC at 600 Vac and 100 kAIC at 300 Vdc. Application → Critical loads such as drives and feeders in industrial environments. Benefit → Faster fault clearance and reduced fault current impact on upstream devices, lowering maintenance costs. Feature → Ferrule end x ferrule end, 5 in length, 0.81 in width, 0.81 in height, 1.6 lb weight. Application → Seamless fit in standard fuse holders and compact control panels. Benefit → Easier installation, standardized replacement, and reliable retention in dense panel layouts. Feature → Electrically isolated end caps and non-indicating design. Application → Safer maintenance and clearer fault tracing in complex cabinets. Benefit → Minimal handling risk and straightforward diagnostics during servicing. Feature → Compliance and support ecosystem: CE Marked with Class RK1 construction; RoHS guidance available via Eaton resources. Application → Global deployments requiring regulatory alignment and traceability. Benefit → Confidence in compliance, easier sourcing, and streamlined procurement across multiple sites.

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FAQs

The LPS-RK-4-1/2SP uses ferrule-end connections designed for common 5 inch fuse holders. Ensure the holder is rated for 600 VAC and 300 VDC with a Class RK1-compatible slot. Align ferrules, push in fully, and confirm secure seating. Use protective PPE when handling energized circuits and verify continuity with a meter after installation.
Key ratings include 4.5 A nominal amperage, 600 VAC / 300 VDC voltage ratings, and interrupting ratings of 300 kAIC at 600 VAC and 100 kAIC at 300 VDC. It is time-delay (slow-blow) and current-limiting with a 10 second response at 500% overload, making it suitable for inrush-rich loads.
Yes. The LPS-RK-4-1/2SP is designed for motor feeders and control panels, offering dual-element protection and current-limiting behavior to withstand startup surges. Its RK1 class construction and CE marking support reliable protection in industrial automation environments without nuisance trips during normal inrush.
The fuse is CE marked and built to Class RK1 standards, signaling conformity with European electrical protection requirements. While RoHS guidance is available via Eaton resources, verify local regulatory needs for your region. These certifications help streamline compliance in global deployments and simplify supplier qualification.
Maintenance benefits stem from reduced nuisance trips and longer downstream component life due to controlled inrush handling. With durable dual-element construction and standard packaging (10 per box), replacement is predictable and downtime costs are minimized. The high interrupt ratings also protect feeders and drives, contributing to lower maintenance frequency and better ROI over equipment life.