Eaton LPN-RK-4/10SP Fuse - Class RK1, Time-Delay
Part Number: LPN-RK-4/10SP
Quick Summary
The Eaton LPN-RK-4/10SP fuse is a time-delay, dual-element overcurrent protector for low-voltage motor circuits. Engineers often struggle with nuisance trips during motor start-up and inrush, risking downtime. This device carries CE marking and aligns with Class RK1 standards, delivering reliable protection while enabling easy compliance. In practice, it supports compact installation, precise current limiting, and robust motor protection, complementing standard fuse blocks. With a 0.4 A amperage rating and voltage options of 250 Vac / 125 Vdc, it delivers precise, time-delay protection for small motor loads and equipment, supported by a 300 kAIC interrupt rating at 250 Vac and 100 kAIC at 125 Vdc.
Product Information
Extended Description
LPN-RK-4/10SP Eaton: Eaton Bussmann Series Class RK1 fuse, LPN-RK, time-delay, dual-element, current limiting fuse, 0.4 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-4/10SP
UPC
051712538046
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
0.4 A
Interrupt rating
300 kAIC at 250 Vac 100 kAIC at 125 Vdc
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
Bussmann Full Line Catalog
Bussmann Full Line Catalog
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: The time-delay dual-element design minimizes nuisance trips during motor start-up and inrush, reducing unplanned downtime and extending motor life in conveyors, pumps, and fans. This leads to improved line availability and lower maintenance costs in critical process lines. Feature → Business Impact → Application: Current-limiting capability reduces fault currents and speeds fault clearing, protecting conductors, contactors, and upstream protection devices, while helping to coordinate selective tripping in motor control centers. Application includes HVAC compressors, machine tools, and material-handling equipment where precise protection matters. Feature → Business Impact → Application: Compact 2 inch length with 0.56 inch width and height and standard packaging enables straightforward retrofit into existing fuse blocks and panel boards, cutting installation time and reducing wiring complexity across retrofit projects. Feature → Business Impact → Application: 300 kAIC interrupt rating at 250 Vac and 100 kAIC at 125 Vdc provides robust protection for high-energy circuits, lowering arc-flash risk and supporting compliant panel design in industrial settings. Feature → Business Impact → Application: CE marking and Class RK1 alignment simplify regulatory compliance for European installations while offering dependable performance in global facilities. Special features include high in-rush current motor protection, enhancing protection for motors subject to surge loads.
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FAQs
The LPN-RK-4/10SP is designed for low-voltage motor circuits and fits standard fuse blocks. It complements motor starters, contactors, pumps, and conveyor drives by providing time-delay, dual-element protection with current-limiting capability to reduce nuisance trips during startup.
The fuse is rated at 0.4 A with voltage ratings of 250 Vac and 125 Vdc. It offers an interrupt rating of 300 kAIC at 250 Vac and 100 kAIC at 125 Vdc, with a response time specified as 8 seconds at 500% for controlled inrush handling.
Yes, the LPN-RK-4/10SP is CE marked, meeting European safety and conformity requirements. This supports compliance in European facilities, with Class RK1 indicating its fuse-class performance for motor protection in accordance with relevant standards.
The time-delay feature accommodates motor inrush currents without nuisance tripping, while the dual-element construction provides improved fault tolerance. This combination minimizes downtime, protects wiring and components, and extends motor life in applications such as pumps, HVAC, and conveyors.
The fuse measures 2 inches in length with 0.56 inch width and height, weighs about 0.5 lb, and comes in standard packaging. It is cataloged as LPN-RK-4/10SP, with a quantity of 10 per pack and UPC 051712538046 for ordering and inventory management.