Eaton LPN-RK-20SP Fuse - Class RK1 Time-Delay, 300 kAIC
Part Number: LPN-RK-20SP
Quick Summary
Eaton LPN-RK-20SP fuse provides time-delay, dual-element protection for motor circuits and low-voltage power systems. It helps prevent nuisance trips during startup while still delivering reliable overcurrent protection for demanding industrial loads. CE-marked and designed around Class RK1 standards, this fuse combines safety compliance with proven reliability in rugged environments. The dual-element, current-limiting design supports economical panel protection and better coordination with upstream devices. By delivering predictable response in high inrush scenarios and reducing unplanned downtime, it supports improved machine uptime, safer operation, and lower total cost of ownership in electrical protection strategies. Use it in low-voltage branch circuits and motor-control panels to align performance with design intent and maintenance cycles.
Product Information
Extended Description
LPN-RK-20SP Eaton: Eaton Bussmann Series Class RK1 fuse, LPN-RK, time-delay, dual-element, current limiting fuse, 20 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-20SP
UPC
051712538343
Product Length/Depth
2 in
Product Height
0.56 in
Product Width
0.56 in
Product Weight
0.5 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
20 A
Interrupt rating
300 kAIC at 250 Vac 100 kAIC at 125 Vdc
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
Connection
Ferrule end x ferrule end
Fuse indicator
Non-indicating
Quantity
10
Special features
Non-indicating, High in-rush current motor protection
Low Voltage Branch Circuit Fuse Chapter
Low Voltage Branch Circuit Fuse Chapter
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
Feature → Business Impact → Application: Time-delay, dual-element design provides selective coordination and smoother motor starts, reducing nuisance trips and extending motor life in drive and pump systems. This translates to lower maintenance costs and higher productivity for automated machinery in manufacturing lines. Feature → Business Impact → Application: 20 A rating with 300 kAIC at 250 Vac and 100 kAIC at 125 Vdc delivers high fault tolerance in demanding installations, enabling safe operation of feeders and control circuits in distribution panels and industrial enclosures. This supports compliance with safety standards while keeping downtime to a minimum during fault events. Feature → Business Impact → Application: Current-limiting performance protects downstream components from short circuits, enabling faster restoration after a fault and allowing upstream protection schemes to operate more effectively in dynamic loads such as fans, conveyors, and presses. Feature → Business Impact → Application: Non-indicating design reduces potential false indicators in harsh environments and simplifies replacement workflows in crowded panels, while ferrule-to-ferrule terminations ensure robust, vibration-tolerant connections in compact layouts. Feature → Business Impact → Application: 2-element construction provides built-in reliability against gradual aging and thermal cycling, improving long-term protection for motor-control centers and machine control panels in manufacturing facilities. Feature → Business Impact → Application: CE compliance ensures adherence to European safety requirements, supporting cross-border deployments and supplier qualifications for regulated industries. This fuse is further compatible with Bussmann RK1 family devices for standardized protection across multiple panels and installations. The integration of a standard packaging format simplifies stocking and field swaps, accelerating maintenance routines and reducing downtime during fuse replacements.
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FAQs
The LPN-RK-20SP uses ferrule end x ferrule end terminations and follows the RK1 class format, making it compatible with standard Bussmann RK1 fuse blocks and common low-voltage panelboard layouts. For best results, pair with manufacturer-approved RK1 holders and ensure ferrule crimp specifications match the conductor size. Typical installations in motor control centers and machine panels benefit from the consistent axial length and the standard 2 in depth. Always verify mounting clearance and conductor routing to maintain proper heat dissipation and UL/CE compliance in the final assembly.
The LPN-RK-20SP is rated at 20 A with an interrupt rating of 300 kAIC at 250 Vac and 100 kAIC at 125 Vdc. It features a voltage rating of 250 Vac and 125 Vdc and a response time of 8 seconds at 500% overload. These ratings support motor protection and fault isolation in demanding industrial panels while maintaining a safe, predictable trip characteristic. These specs enable selective coordination with upstream protection devices in distribution schemes designed for high inrush applications.
Yes. The LPN-RK-20SP is a time-delay, dual-element fuse optimized for motors and high inrush scenarios. Its 8-second response at 500% overload provides protection during startup surges while limiting short-circuit current flow to downstream components. This helps protect motor windings, drives, and control circuits from damaging overloads without prematurely disconnecting during normal startup transients, improving machine availability in manufacturing and packaging lines.
The LPN-RK-20SP is CE marked, indicating compliance with European safety standards. This designation supports regulatory alignment for projects across Europe and within multinational facilities requiring EU conformity. While the data sheet highlights CE compliance, always confirm any regional requirements or additional certifications your specific project may mandate, such as RoHS or local electrical codes, to ensure full regulatory readiness.
Investing in the LPN-RK-20SP can yield measurable ROI through reduced downtime and longer intervals between fuse replacements due to its robust time-delay and current-limiting performance. The dual-element RK1 design enhances protection for motors and feeders, lowering the likelihood of collateral damage from faults. In practice, this translates to fewer panel outages, safer startup sequences, and lower maintenance labor costs in facilities with high switching activity or frequent inrush events.