Eaton LPN-RK-400SPI Fuse - Class RK1, 400A, CE Marked
Part Number: LPN-RK-400SPI
Quick Summary
Eaton LPN-RK-400SPI fuse delivers reliable motor-protection with time-delay, dual-element current limiting for industrial drives and power panels. Inconsistent protection and nuisance trips can cut uptime and inflate maintenance costs across manufacturing environments. This device is CE marked and conforms to Class RK1 protection standards, supporting compliance and safe integration in control panels. With a blade-end connection and robust interrupting capability, it is well-suited for high-load applications where reliability matters. For engineers and buyers, the LPN-RK-400SPI offers predictable protection, easy installation, and supply-chain stability, helping reduce spare parts complexity while meeting demanding safety and performance targets. This combination supports uptime, minimizes downtime costs, and accelerates decisions for critical protection upgrades.
Product Information
Extended Description
LPN-RK-400SPI Eaton: Eaton Bussmann Series Class RK1 fuse, LPN-RK, time-delay, dual-element, current limiting fuse, 400 A, indicating fuse, interrupting rating of 300 kA at 250 Vac
Product Name
Eaton Bussmann series LPN-RK fuse
Catalog Number
LPN-RK-400SPI
UPC
051712626835
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
400 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
Connection
Blade end x blade end
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
Time-delay, dual-element, current-limiting design provides reliable fault tolerance while reducing nuisance tripping. This translates to lower maintenance costs, fewer unplanned outages, and longer motor life for critical loads such as motors, drives, and feeders in manufacturing and process environments. The 400 A amperage rating paired with a 300 kA interrupt capability at 250 VAC ensures safe interruption of high fault currents, safeguarding people, wiring, and switchgear in main feeders, motor start circuits, and control panels. Blade-end x blade-end connections simplify installation in standard RK1 housings, while the compact footprint (8.63 in long, 2.36 in wide and high) and 1.75 lb weight facilitate replacement in crowded panels. Special features include options for non-indicating or indicator variants to support diagnostics and status monitoring, improving maintenance planning and reducing downtime.
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FAQs
The LPN-RK-400SPI is designed for standard Bussmann RK1 style assemblies with blade-end connections, enabling straightforward replacement in existing motor control panels. It fits typical industrial switchgear footprints and supports standard mounting clearances. When installing, verify the blade-end terminals align with the busbar configuration and that the panel rating matches the 250 VAC / 400 A specification for safe, reliable operation.
Key specs include a 400 A amperage rating and an interrupt rating of 300 kAIC at 250 VAC, with a voltage rating of 250 VAC and 250 VDC. It is a time-delay, dual-element, current-limiting fuse suitable for motor inrush and short-circuit protection. These ratings support reliable protection for high-load motor circuits while minimizing nuisance trips in normal operation.
Yes. The time-delay, dual-element design accommodates motor inrush without compromising protection, making it well-suited for motor drives and conveyors. Its current-limiting capability confines fault energy, reducing damage to conductors and components. For best results, match the device’s 400 A rating to the protected circuit and ensure the 250 VAC environment is within spec.
The LPN-RK-400SPI is CE marked and classified as a Class RK1 fuse, confirming compliance with European safety standards and protection-class requirements. This combination supports regulatory alignment in global control panels and enhances supplier assurance for motor-protection schemes in industrial settings.
By reducing nuisance trips through time-delay protection while maintaining fast fault interruption, the LPN-RK-400SPI helps minimize unplanned downtime and extend motor life. Its robust ratings simplify spares management in large facilities, lowering maintenance frequency and inventory costs, and ensuring quicker, safer restoration of production after a fault.