Eaton LPN-RK-300SPI Fuse for Automation - Class RK1
Part Number: LPN-RK-300SPI
Quick Summary
LPN-RK-300SPI fuse provides time-delay, dual-element protection for industrial motor control and power distribution. End users often struggle with nuisance trips during motor startup and inrush events; this fuse mitigates those issues while safeguarding circuits. Compliant with CE marking, and classified as RK1, it aligns with European safety expectations and Bussmann’s proven RK1 family performance. Designed for reliable incorporation into control panels and drives, it delivers robust protection with measurable business value, including reduced downtime and improved panel reliability. Use cases span motor control centers, drives, and power distribution where high inrush currents are common and uptime matters.
Product Information
Extended Description
LPN-RK-300SPI Eaton: Eaton Bussmann Series Class RK1 fuse, LPN-RK, time-delay, dual-element, current limiting fuse, 300 A, indicating fuse, interrupting rating of 300 kA at 250 Vac
Product Name
Eaton Bussmann series LPN-RK fuse
Catalog Number
LPN-RK-300SPI
UPC
051712626811
Product Length/Depth
8.63 in
Product Height
2.36 in
Product Width
2.36 in
Product Weight
1.75 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
300 A
Interrupt rating
100 kAIC at 250 Vdc 300 kAIC at 250 Vac
Voltage rating
250 Vac, 250 Vdc
Fuse type
Time delay Current-limiting
Number of elements
Dual
Packaging type
Standard
Class
Class RK1
Fuse indicator
Non-indicating With Indicator
Quantity
1
Special features
Non-indicating, High in-rush current motor protection
Bussmann series Class J Low-Peak fuse 70-600A data sheet No. 1007
Bussmann Full Line Catalog
Bussmann Full Line Catalog
RoHS Search Tool
Bussmann series Fuseology
Feature: Time-delay dual-element design provides controlled response to inrush and short-duration overloads. Business Impact: Reduces nuisance tripping in motor-start applications while maintaining circuit protection. Application: Ideal for conveyor systems, pumps, and HVAC drives where motors experience brief surges. Feature: Current-limiting capability enhances safety by limiting fault current, protecting downstream components. Business Impact: Limits arc-flash risk and minimizes collateral damage during faults. Application: Panel boards and feed circuits with dense loading and sensitive electronics. Feature: High interrupt rating of 300 kAIC at 250 Vac ensures reliable fault interruption. Business Impact: Improves system resilience in high-current fault scenarios, reducing downtime. Application: Large motor drives and industrial automation racks. Feature: Time-delay, dual-element configuration accommodates motor inrush while preserving protection. Business Impact: Extends motor life and reduces maintenance costs by avoiding unnecessary fuse blows. Application: Starter and control-circuit protection in machine tools and packaging lines. Feature: Physical dimensions and packaging (8.63 in length, 2.36 in width/height, 1.75 lb) enable straightforward integration. Business Impact: Simplifies panel layout and replacement logistics with predictable form-factor. Application: Retrofit projects and new panel builds following Bussmann RK1 standards. Feature: Compliance and classification (CE Marked, Class RK1) provide regulatory and compatibility confidence. Business Impact: Facilitates regulatory approvals and standardization across equipment fleets. Application: European installations and new-build automation architectures.
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FAQs
Yes. The LPN-RK-300SPI is a Class RK1 fuse designed for RK1-compatible panels and Bussmann assemblies. Its 8.63 in length and 2.36 in width ensure predictable fitment in standard control enclosures, while the 1.75 lb weight supports straightforward handling during retrofit or new installations.
Time-delay allows temporary overcurrents from motor startup to pass without tripping, while the dual-element construction provides fast response to sustained faults. This combination reduces nuisance trips, protects motor windings, and minimizes downtime in high-inrush applications typical of conveyors, pumps, and fans.
This fuse is well suited for industrial motor control centers, drives, and power-distribution panels across manufacturing, material handling, and packaging sectors. Its 300 A rating and 250 Vac operation support large motors, while the 300 kAIC interrupt rating adds protection for high fault-current environments.
The LPN-RK-300SPI is CE-marked, indicating compliance with European safety standards. It is part of Eaton/Bussmann RK1 family, providing a recognized class and design alignment for panel builders and OEMs coordinating component libraries.
By reducing nuisance trips and delivering robust fault interruption, the LPN-RK-300SPI lowers unplanned downtime and maintenance costs. Its standardized RK1 form factor simplifies stocking and replacements, while the high interrupt rating supports continuity in critical power circuits, delivering a favorable total cost of ownership over motor-driven equipment life cycles.