Eaton LPN-RK-50SPI Fuse - Class RK1, 300 kAIC CE Marked
Part Number: LPN-RK-50SPI
Quick Summary
LPN-RK-50SPI is a time-delay fuse designed for protecting motors and electrical circuits in industrial panels. Engineers often contend with nuisance trips and downtime caused by inrush currents and short surges. Its CE Marking and Class RK1 construction support compliant installation across European and global switchgear environments. Built as a dual-element, current-limiting time-delay fuse, it helps optimize motor protection while reducing total cost of ownership. In short, LPN-RK-50SPI aligns with reliability-focused procurement by delivering fast fault interruption with high interrupt ratings. This makes it a scalable choice for control panels, power distribution blocks, and equipment enclosures where safe, predictable protection is essential.
Product Information
Extended Description
LPN-RK-50SPI Eaton: Eaton Bussmann Series Class RK1 fuse, LPN-RK, time-delay, dual-element, current limiting fuse, 50 A, indicating fuse, interrupting rating of 300 kA at 250 Vac
Product Name
Eaton Bussmann series LPN-RK fuse
Catalog Number
LPN-RK-50SPI
UPC
051712626729
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
50 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
Electrically isolated end cap
Bussmann Full Line Catalog
Bussmann Full Line Catalog
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Bussmann series Fuseology
Bussmann series Low-Peak 250 V LPN Class RK1 time-delay fuses,1/10-60 A data sheet no. 1003
Feature: Time-delay, dual-element, current-limiting design. Benefit: Enables selective coordination and reduces nuisance trips during motor starts, improving uptime in industrial applications. Application: Suitable for motor protection in drive systems and control cabinets, where inrush is common and dependable protection is required. Feature → Business Impact → Application: High reliability with efficient inrush handling translates to lower maintenance costs and longer equipment life in manufacturing lines and packaging equipment.Feature: 50 A, 250 Vac rating with 300 kAIC interrupt capability at 250 Vac and 100 kAIC at 125 Vdc. Benefit: Delivers robust fault interruption for critical loads, while maintaining safe clearing of short circuits. Application: Power distribution blocks and machine controls facing high fault currents, ensuring machine safety and minimal downtime.Feature: Class RK1 fuse construction and dual-element configuration. Benefit: Time-delay protection paired with current-limiting action enhances selectivity and fault isolation. Application: Panelboards and starter circuits where protection must be precise and maintenance-friendly.Feature: Size and packaging—3 in length, 0.81 in width and height, standard packaging. Benefit: Fits standard fuse blocks and retrofit replacements without custom hardware. Application: Retrofit projects and new installations in compact control panels.Feature: Electrically isolated end cap and availability in indicators. Benefit: Safer installation, easier inspection, and quick status checks during maintenance. Application: Enclosed electrical protection in factories, where worker safety and rapid fault diagnosis matter. Compliance with CE Marked requirements reinforces regulatory alignment across end-user environments.
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FAQs
The LPN-RK-50SPI fits standard 3 inch long fuse blocks used in industrial panels and control cabinets. With a 50 A rating, 250 Vac operation, and a dual-element, time-delay design, it is compatible with motor control circuits, drives, and power distribution blocks that require reliable protection and easy retrofit in existing enclosures.
It provides a 300 kAIC interrupt rating at 250 Vac and 100 kAIC at 125 Vdc, with a response time of 10 seconds at 500% overload. The fuse is time-delay and current-limiting, enabling selective protection for motors and feeders while tolerating inrush during startup without nuisance tripping.
Best suited for motor protection in industrial panels, power distribution blocks, and control circuits. Its Class RK1 designation plus dual-element construction provides dependable protection in manufacturing, packaging, and process environments, especially where inrush currents are common and panel space is constrained.
Yes, the LPN-RK-50SPI is CE marked, indicating compliance with European safety standards. This makes it suitable for global deployments where EU regulatory alignment is a requirement, and helps streamline regulatory approvals during panel design and equipment sourcing.
The dual-element, current-limiting design reduces nuisance trips and improves uptime, delivering lower maintenance costs and less unplanned downtime. An available indicator variant aids quick fault identification, and the electrically isolated end cap enhances safety during servicing, contributing to lower lifecycle costs and faster troubleshooting in production environments.