Eaton LPN-RK-400SP Fuse - RK1 Time-Delay Current-Limiting
Part Number: LPN-RK-400SP
Quick Summary
The Eaton LPN-RK-400SP fuse provides reliable motor protection and circuit safeguarding for industrial drives and equipment. This time-delay, dual-element device helps prevent nuisance tripping during motor startup while still delivering rapid fault interruption when faults occur. It carries CE Marked and RoHS Compliant certifications, aligning with global compliance expectations for electrical protection in production environments. By combining high current capability with robust interruption performance, this fuse supports safer, more efficient protection schemes and reduces unplanned downtime, contributing to lower maintenance costs and improved system uptime. With standard blade-end connections and a Class RK1 designation, it integrates smoothly into common panel layouts and legacy Bussmann-series installations.
Product Information
Extended Description
LPN-RK-400SP Eaton: Eaton Bussmann Series Class RK1 fuse, LPN-RK, time-delay, dual-element, current limiting fuse, 400 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-400SP
UPC
051712538558
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
CE Marked RoHS Compliant
Amperage Rating
400 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
Low Voltage Branch Circuit Fuse Chapter
Low Voltage Branch Circuit Fuse Chapter
RoHS Search Tool
Bussmann series Fuseology
Feature → Time-delay, dual-element design provides sustained protection during motor inrush and short-term overloads, reducing nuisance trips and equipment wear. Business Impact → Improves uptime and motor life while maintaining selective protection in motor control centers. Application → Suitable for high in-rush current motors in conveyors, pumps, and HVAC drives. Feature → Current-limiting interruption with a 300 kAIC rating at 250 Vac ensures quick fault clearing and minimizes incident energy. Business Impact → Enhances panel safety margins and protects downstream components in demanding industrial environments. Application → Ideal for machine centers where dense fault currents are possible. Feature → 400 A amperage rating supports heavy-duty protection in medium to large motor loads. Business Impact → Enables compact protection schemes without oversized fuses, reducing enclosure heat and wiring. Application → Useful in power distribution blocks and motor starter assemblies. Feature → Non-indicating, blade-end connections simplify installation and diagnostics. Business Impact → Speeds up replacements and reduces maintenance complexity. Application → Fits standard Bussmann installation footprints in retrofit projects. Feature → CE Marked, RoHS compliant status reinforces regulatory alignment. Business Impact → Ensures market-ready compliance and greener manufacturing. Application → Essential for facilities targeting compliance-driven procurement and audits.
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FAQs
The LPN-RK-400SP uses standard blade-end terminals, enabling straightforward drop-in replacement in existing Bussmann RK1 assemblies. Verify panel clearance, torque requirements on end-blade contacts, and alignment with compatible disconnects. Use clean, dry interfaces and confirm correct orientation to ensure reliable fault clearing and mechanical stability during vibration. This minimizes contact resistance and maintains interrupt performance over the fuse’s service life.
This model is time-delay and current-limiting, designed to tolerate startup surges while still interrupting faults quickly. With a 400 A rating and 300 kAIC at 250 Vac, it protects motors and wiring from prolonged overloads and high-energy faults. For HVAC fans or conveyors with brief inrush, the dual-element design helps maintain stability, reducing nuisance trips during startup sequences.
Yes, the fuse is CE marked and RoHS compliant, aligning with European and global environmental and safety requirements. This supports regulatory procurement, product risk mitigation, and audit readiness for manufacturing facilities seeking compliant protection devices in electrical panels.
Class RK1 fuses are well-suited for motor protection, machine control circuits, and power distribution where short-circuit current must be interrupted rapidly without compromising startup sequences. The LPN-RK-400SP’s 8.63 in length and dual-element construction make it compatible with standard Bussmann-series configurations in retrofit and new-build panels.
The non-indicating design reduces nuisance checks, while robust interruption ratings help prevent collateral damage during faults. Its compatibility with standard blade-end inserts simplifies stock management and replacements, lowering maintenance time and inventory costs. Over time, this translates to fewer unplanned outages and improved equipment availability.