Eaton LPN-RK-300SP Fuse - Class RK1, 300A, 300 kAIC
Part Number: LPN-RK-300SP
Quick Summary
The Eaton LPN-RK-300SP fuse provides time-delay, dual-element protection for industrial motors and power circuits. Users often battle nuisance trips during motor inrush and startup surges that derail production schedules. It is CE marked and RoHS compliant, with Class RK1 protection to meet established industry standards. This fuse delivers reliable motor protection with a compact footprint, supporting streamlined procurement and compatible Eaton Bussmann products for scalable protection across facilities.
Product Information
Extended Description
LPN-RK-300SP Eaton: Eaton Bussmann Series Class RK1 fuse, LPN-RK, time-delay, dual-element, current limiting fuse, 300 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-300SP
UPC
051712538534
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
RoHS Compliant CE Marked
Amperage Rating
300 A
Interrupt rating
300 kAIC at 250 Vac 100 kAIC at 250 Vdc
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
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
Feature: Time-delay, dual-element design protects circuits from nuisance trips during motor inrush. Business impact: Reduces unplanned downtime while maintaining robust overcurrent protection, enabling smoother motor starts in drives and conveyors. Application: Motor control centers and equipment panels where startup surges are common. Feature: Current-limiting capability confines fault currents, limiting damage and heat rise in nearby components. Business impact: Improves safety margins and reduces collateral equipment wear, lowering maintenance costs over the system lifecycle. Application: feeders and branch circuits in industrial distributions. Feature: 300 A amperage rating supports high-load motor circuits without unnecessary nuisance tripping. Business impact: Enhances productivity by allowing higher surge tolerance while preserving protection, shortening downtime during peak loads. Application: large motors and pump assemblies in manufacturing lines. Feature: High interrupt ratings of 300 kAIC at 250 Vac and 100 kAIC at 250 Vdc ensure reliable fault interruption. Business impact: Protects personnel and equipment from damaging faults, enabling safer startup sequences and compliance with electrical codes. Application: critical power distribution and motor-start applications. Feature: Blade-end, non-indicating physical connection simplifies retrofit and replacement in existing panels. Business impact: Reduces installation time and reduces the risk of wiring errors during upgrades. Application: standard electrical protection installations in retrofit projects. Feature: RoHS compliance and CE marking streamline regulatory approvals and imports. Business impact: Accelerates project timelines, supports global deployments, and aligns with sustainability goals. Application: global manufacturing environments with strict compliance requirements. Feature: Class RK1 designation provides a recognized protection class for standardized sizing and performance. Business impact: Improves compatibility with Bussmann series catalogs and ensures predictable performance across Eaton protection products. Application: panel builders and electricians configuring standardized motor protection ensembles.
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FAQs
The LPN-RK-300SP uses blade end x blade end connections and is designed for standard packaging in panel boards. Ensure compatible Bussmann series components and proper torque on connections to maintain reliable contact. Verify voltage rating of 250 Vac and 250 Vdc aligns with system requirements, and confirm a non-indicating fuse aligns with diagnostic practices in your control panels.
This fuse is rated for 300 A continuous amperage with an interrupt rating of 300 kAIC at 250 Vac and 100 kAIC at 250 Vdc. Voltage ratings of 250 Vac and 250 Vdc support both AC and DC protection scenarios, while time-delay, current-limiting characteristics help manage motor inrush without sacrificing fault protection.
Yes, the LPN-RK-300SP supports DC circuits up to 250 Vdc with a 100 kAIC interrupt rating, making it suitable for DC motor protection in appropriate applications. For best results, confirm the DC operating conditions, inrush behavior, and cooling in your panel to ensure the fuse remains within its time-delay and current-limiting performance envelope.
The LPN-RK-300SP is CE Marked and RoHS compliant, ensuring compliance with European regulatory requirements and sustainability standards. While not listed with UL or IP ratings in the provided data, these two certifications support global product acceptance and safer integration in formal electrical protection schemes across industrial facilities.
Non-indicating design reduces diagnostic clutter, while its high interrupt capability and dual-element protection minimize downstream damage from faults. This can lower maintenance costs and downtime, improve equipment availability, and simplify procurement by aligning with other Eaton Bussmann components in a unified protection strategy.