Eaton LPN-RK-3SP Fuse - Class RK1 Time-Delay
Part Number: LPN-RK-3SP
Quick Summary
The Eaton LPN-RK-3SP fuse is a Class RK1 time-delay, dual-element protection device designed for industrial control panels and motor circuits. It addresses nuisance tripping by tolerating inrush currents while still delivering reliable short-circuit protection. This part carries CE marking and RoHS compliance, ensuring regulatory alignment across global facilities. With ferrule-end connections and a compact 2 inch length, it installs easily in standard panelboards and control enclosures. The unit’s current rating of 3 A and high interrupt capability provide robust protection for small motors, pumps, and actuators, translating into reduced downtime and lower maintenance costs for OEMs and end users.
Product Information
Extended Description
LPN-RK-3SP Eaton: Eaton Bussmann Series Class RK1 fuse, LPN-RK, time-delay, dual-element, current limiting fuse, 3 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-3SP
UPC
051712538183
EAN
5027590243698
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
3 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
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
Feature: Dual-element time-delay design. Benefit: Balances inrush tolerance with current-limiting protection, reducing nuisance trips and extending motor life. Application: protects small motors, conveyors, and control circuits in machine panels, improving uptime and reliability. Feature: Class RK1 designation. Benefit: Standardized protection for a wide range of general-purpose circuits, ensuring regulatory compliance and interchangeability across Eaton Bussmann products. Application: control cabinets and feeder circuits in industrial environments. Feature: 3 A amperage rating with 250 Vac / 125 Vdc ratings. Benefit: Precise protection for low-current devices while supporting versatile voltage sources, reducing component damage during faults. Application: small relay coils, sensors, and actuators in automated lines. Feature: Time-delay, current-limiting fuse type. Benefit: Manages short disturbances without compromising protection, enabling safe motor startups. Application: motor drivers and drives with high inrush characteristics. Feature: Ferrule end x ferrule end, standard packaging. Benefit: Quick, reliable field replacement and straightforward panel installation, minimizing service time. Application: retrofit or new-build control panels in manufacturing and processing facilities. Feature: Non-indicating fuse with high interrupt ratings. Benefit: Minimal visual indicators reduce panel clutter while maintaining strong fault clearance performance. Application: crowded electrical rooms where clear indication is provided by external diagnostic systems. This combination delivers measurable outcomes: lower downtime, improved equipment protection, regulatory compliance, and simplified maintenance workflows for engineers, procurement teams, and OEM partners.
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FAQs
The LPN-RK-3SP is designed with ferrule-end x ferrule-end connections and a compact 2 inch length, enabling easy drop-in replacement in standard control panels. Its dual-element, time-delay construction supports motor and drive protection while minimizing panel space requirements. When planning installation, verify panel cutouts, conductor sizing, and torque specs for reliable contact integrity.
Key specs include a 3 A amperage rating, voltage rating of 250 Vac / 125 Vdc, and a high interrupt rating of up to 300 kAIC at 250 Vac and 100 kAIC at 125 Vdc. The time-delay, current-limiting design tolerates motor inrush while preserving short-circuit protection, reducing nuisance trips during startup and prolonging motor life.
Yes. The LPN-RK-3SP is CE marked and RoHS compliant, aligning with European safety standards and sustainability requirements. This makes it suitable for international equipment and panel builds, supporting compliance across manufacturing facilities and end-user sites.
This fuse is ideal for small motors, pumps, actuators, and control panels in manufacturing, packaging, and process industries. It protects circuits with modest current needs while tolerating inrush, enabling reliable motor protection in conveyors, fans, and automated lines without compromising uptime or safety.
The LPN-RK-3SP is non-indicating, meaning it does not provide a built-in visual status indicator. For fault diagnostics, plan to integrate external panel indicators or status monitoring through the control system or an auxiliary indicator accessory to confirm fuse condition in real time.