Eaton LPN-RK-2-1/4SP Fuse - Class RK1, 2.25A, CE Marked
Part Number: LPN-RK-2-1/4SP
Quick Summary
LPN-RK-2-1/4SP fuse is a time-delay, dual-element protection device used to safeguard motors and power circuits. This design helps prevent nuisance trips during motor start-up while preserving circuits from short circuits and faults. The device carries CE marking and is classified as Class RK1, aligning with protective standards for industrial panels. For engineers evaluating protection strategies, this fuse offers dependable motor protection with predictable operation. In addition to protection, it supports high inrush motor loading and ease of procurement, making it a practical choice for both new builds and retrofit projects. Its compatibility with standard Bussmann RK1 holders further facilitates fast, cost-effective panel modernization.
Product Information
Extended Description
LPN-RK-2-1/4SP Eaton: Eaton Bussmann Series Class RK1 fuse, LPN-RK, time-delay, dual-element, current limiting fuse, 2.25 A, non-indicating fuse, interrupting rating of 300 kA at 250 Vac and 100 kA at 125 Vdc
Product Name
Eaton Bussmann series LPN-RK fuse
Catalog Number
LPN-RK-2-1/4SP
UPC
051712538152
Product Length/Depth
2 in
Product Height
0.56 in
Product Width
0.56 in
Product Weight
0.03 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
2.25 A
Interrupt rating
100 kAIC at 125 Vdc 300 kAIC at 250 Vac
Response time
8 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
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 delivers precise protection for motor circuits and power feeds. This approach minimizes nuisance trips during motor start-up while maintaining robust short-circuit defense, helping motors reach speed quickly and stay protected through transient surges. The LPN-RK-2-1/4SP is well suited for high inrush loads in drives, conveyors, compressors, and HVAC equipment, where reliable protection reduces wear, energy waste, and maintenance costs. Current-limiting action paired with a 2.25 A rating preserves downstream electronics and control logic during overload events. The result is less thermal stress on contactors, relays, and wiring, which translates to longer service life and lower replacement costs. In panel builders and OEM applications, it supports predictable protection without sacrificing performance, and it enables longer intervals between preventive maintenance. High interrupt ratings of 100 kAIC at 125 Vdc and 300 kAIC at 250 Vac ensure rapid fault clearance, protecting equipment inside enclosures and reducing damage to upstream power distribution. Compatibility with standard RK1 holders ensures easy substitution in existing Bussmann installations, minimizing redesign work and spare-part variety. The fuse’s 2 in length and 0.56 in cross-section fit typical fuse blocks, panel rails, and compact enclosures, while the non-indicating design reduces panel clutter and simplifies status checks during routine maintenance. CE compliance and non-indicating status support straightforward audits and regulatory adherence across European sites and global installations. Coupled with a compact form factor, rugged construction, and proven protection performance, this fuse lowers total cost of ownership by reducing downtime, extending equipment life, and enabling fast, economical retrofits in both new builds and retrofit projects. Experts benefit from consistent performance data and field-validated reliability across diverse industries, including manufacturing, water treatment, and energy sectors.
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FAQs
Yes. The LPN-RK-2-1/4SP is designed for standard RK1 fuse holders and Bussmann panel installations. It measures 2 in in length with a 0.56 in cross-section, matching common RK1 blocks. It ships in standard packaging (10 pieces per order) to simplify stocking, retrofits, and replacements in existing panels without layout changes.
Key specs include an amperage rating of 2.25 A, voltage ratings of 250 Vac and 125 Vdc, and interrupt ratings of 300 kAIC at 250 Vac and 100 kAIC at 125 Vdc. It is a time-delay, dual-element, current-limiting fuse with a response time of about 8 seconds at 500% overload, suitable for motor protection.
Ideal for high inrush motor protection in drives, conveyors, pumps, compressors, and HVAC equipment. It supports control panels and electrical distribution where startup surges are common, while providing reliable short-circuit protection. It suits OEM applications and retrofit projects seeking predictable performance and minimal electrical noise during operation.
The fuse is CE Marked, aligning with European safety and performance requirements. It is classified as Class RK1 and features non-indicating status. These attributes support compliance during audits and simplify acceptance in regional and global installations that rely on Bussmann RK1 protection technology.
By reducing nuisance trips and protecting motors from inrush surges, the fuse minimizes unplanned downtime and motor wear. Its compatibility with standard RK1 holders reduces retrofitting effort, while high interrupt ratings enhance fault tolerance. Overall, this translates to lower maintenance costs, longer asset life, and faster, more economical upgrades.