Eaton LPN-RK-250SPI Fuse - Class RK1, 300 kA @ 250V
Part Number: LPN-RK-250SPI
Quick Summary
The LPN-RK-250SPI fuse from Eaton provides time-delay motor protection and current limiting in electrical panels. Engineers frequently contend with nuisance trips during motor startup, which can halt production and complicate panel design. This CE-marked device belongs to the Class RK1 family and features dual-element, time-delay operation to balance protection with inrush tolerance. Designed for compatibility with Bussmann series assemblies, it supports reliable protection of motors, drives, and power circuits while helping reduce downtime and spare part costs. With 250 A rating and a 300 kA interrupt rating at 250 Vac, it delivers strong short-circuit protection without hindering startup. Its compact 8.63 in length and standard Bussmann form factor simplify procurement and installation in existing panels.
Product Information
Extended Description
LPN-RK-250SPI Eaton: Eaton Bussmann Series Class RK1 fuse, LPN-RK, time-delay, dual-element, current limiting fuse, 250 A, indicating fuse, interrupting rating of 300 kA at 250 Vac
Product Name
Eaton Bussmann series LPN-RK fuse
Catalog Number
LPN-RK-250SPI
UPC
051712626804
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
250 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 → Business Impact → Application: The LPN-RK-250SPI uses a time-delay, dual-element design to tolerate motor inrush while maintaining protection, reducing nuisance trips and enabling smoother starts for conveyors, pumps, and fan assemblies in industrial control panels. This translates to measurable uptime gains and lower maintenance costs in manufacturing lines. Application: motor control centers, drive panels, and factory automation cabinets benefit from reliable protection without sacrificing performance. Feature → Business Impact → Application: The current-limiting capability confines fault current during a short circuit, protecting downstream devices and wiring from excessive stress. This can extend component life, reduce downstream damage, and simplify downstream protection coordination in MCCs and power distribution blocks. Feature → Business Impact → Application: The 300 kAIC at 250 Vac interrupt rating ensures robust short-circuit containment in high-demand drives and equipment racks, supporting safer shutdowns and easier regulatory compliance in heavy industry.Feature → Business Impact → Application: Class RK1 compatibility and standard Bussmann packaging streamline replacement, stocking, and cross-reference in maintenance programs, reducing downtime when spares are needed. Application: modernization projects and panel refurbishments across OEM and aftermarket channels. Feature → Business Impact → Application: The dual-element design and CE marking provide a compliant, readily sourced protection solution for motor startups, pumps, fans, and general machinery, helping engineering teams meet safety standards while improving time-to-market for upgrades. Feature → Business Impact → Application: The fuse’s indicator options (Non-indicating or With Indicator) support visibility on panels where status signaling is critical, enabling quicker fault diagnosis and reduced maintenance cycles.
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FAQs
Install the LPN-RK-250SPI into standard Bussmann series holders with proper mounting hardware in a panel rated for 250Vac. Ensure the panel wiring and bus connections are sized for 250 A continuous current and observe correct orientation for dual-element construction. The device supports straightforward stocking and quick swap-outs in maintenance workflows.
Its time-delay, dual-element design accommodates motor inrush without sacrificing protection. The fuse provides current limiting and a high 300 kA interrupt rating at 250 Vac, delivering robust short-circuit defense for motors, drives, and conveyors while minimizing nuisance trips during startup.
Yes. The LPN-RK-250SPI is CE marked and belongs to the Class RK1 family, aligning with European safety and performance expectations for protective fuses used in industrial power distribution and motor control panels.
Industrial applications with high inrush motors, drives, and equipment racks—such as conveyors, pumps, and HVAC motor starters—benefit from the 300 kAIC interrupt rating at 250Vac, which provides reliable fault containment and protects upstream wiring and components.
The LPN-RK-250SPI uses the standard Bussmann series form factor, enabling easy procurement and quick replacement in existing panels. It is available as a 1-piece package, supports both non-indicating and indicating fuse indicators, and is compatible with other Eaton Bussmann protective devices for cohesive protection schemes.