Eaton LPN-RK-45SPI Fuse - CE Marked
Part Number: LPN-RK-45SPI
Quick Summary
LPN-RK-45SPI is a time-delayed, current-limiting fuse designed for motor control and protection in industrial electrical systems. Engineers often face nuisance trips during motor inrush, and this device mitigates that risk with dual-element, time-delay performance while preserving robust fault protection. The fuse carries CE marking and belongs to the RK1 class, delivering a high interruption rating of 300 kAIC at 250 Vac for demanding fault events. Its compact 3-inch length and standard packaging simplify replacement and integration in existing panels. With a 45 A rating and wide voltage compatibility (250 Vac / 125 Vdc), it supports reliable protection for drives and starters while enabling safer maintenance and predictable reliability on production lines.
Product Information
Extended Description
LPN-RK-45SPI Eaton: Eaton Bussmann Series Class RK1 fuse, LPN-RK, time-delay, dual-element, current limiting fuse, 45 A, indicating fuse, interrupting rating of 300 kA at 250 Vac
Product Name
Eaton Bussmann series LPN-RK fuse
Catalog Number
LPN-RK-45SPI
UPC
051712626712
Product Length/Depth
3 in
Product Height
0.81 in
Product Width
0.81 in
Product Weight
0.12 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
45 A
Interrupt rating
300 kAIC at 250 Vac 100 kAIC at 125 Vdc
Response time
10 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 With Indicator
Quantity
10
Special features
Non-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
Time-delay, dual-element design provides inrush tolerance while maintaining fast fault interruption, reducing nuisance trips in motor circuits and boosting line uptime. This leads to measurable improvements in drive reliability, fewer production stops, and easier maintenance across industrial settings. Applications include motor starters, HVAC drives, conveyors, and other high-inrush loads in manufacturing environments. Current-limiting with a 45 A rating and a 300 kAIC interrupt rating at 250 Vac ensures safe isolation of short circuits in high-energy circuits, enabling protection without sacrificing availability. The compact 3-inch length and standard packaging support easy retrofits and straightforward panel integration. CE Marked compliance and RK1 family lineage align with widely adopted industry standards for motor control, while options for indicating versus non-indicating status simplify field diagnostics. High in-rush protection makes this fuse suitable for drives and starters in automation systems, reducing maintenance cycles and extending equipment life. Industry insights show that proper fuse selection impacts total cost of ownership by limiting fault damage and streamlining spare parts management.
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FAQs
The LPN-RK-45SPI measures 3 inches in length with a compact 0.81 x 0.81 inch cross-section and standard packaging, making it a straightforward drop-in replacement for many fused-block configurations. Ensure the circuit is de-energized, verify the block’s rating matches 250 Vac and 45 A, then insert the fuse with proper orientation and secure end connections to maintain a solid electrical interface.
The 300 kAIC (RMS symmetrical interrupt rating) at 250 Vac indicates the fuse can safely interrupt high-energy fault currents up to 300 kiloamps without exploding fuse links. This level of protection is critical in motor feeders and drive circuits where short-circuit events can be severe, helping protect wiring, components, and personnel while minimizing downtime.
Yes. The LPN-RK-45SPI features time-delay and dual-element construction designed to tolerate inrush currents typical of motor starts, reducing nuisance trips. Its 45 A rating and RK1 class alignment provide reliable protection for drives, conveyors, and HVAC systems, while maintaining fast fault clearance for safety and equipment integrity.
The device is CE Marked, indicating compliance with essential EU safety standards. For additional compliance verification, Eaton offers a RoHS information tool you can use to confirm RoHS status for this product family; consult the RoHS Search Tool linked in Eaton’s documentation to verify current status for your region and application.
By tolerating startup inrush while protecting conductors from short circuits, the LPN-RK-45SPI reduces unplanned downtime and equipment damage. Its current-limiting feature minimizes arc flash risk and spare-part costs, while straightforward installation lowers maintenance time. Over the life of motor-driven lines, this translates to higher uptime, lower total cost of ownership, and more predictable production schedules.