Eaton LPN-RK-350SP Fuse - Class RK1 Time-Delay
Part Number: LPN-RK-350SP
Quick Summary
The Eaton LPN-RK-350SP fuse is a time-delay, current-limiting device designed for reliable protection in motor control circuits and industrial power distribution. Engineers often contend with nuisance inrush trips and brief overcurrents that can interrupt production; this fuse helps balance protection with continuity. It carries a 350 A rating and an interrupting rating of 300 kAIC at 250 VAC and 100 kAIC at 250 VDC, with CE marking and RoHS compliance to support regulatory requirements. For procurement and maintenance teams, its standard packaging, blade-end connections, and non-indicating form streamline stocking and installation, delivering long-term value through reduced downtime and lower total cost of ownership.
Product Information
Extended Description
LPN-RK-350SP Eaton: Eaton Bussmann Series Class RK1 fuse, LPN-RK, time-delay, dual-element, current limiting fuse, 350 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-350SP
UPC
051712538541
Product Length/Depth
8.63 in
Product Height
2.36 in
Product Width
2.36 in
Product Weight
1.95 lb
Warranty
Not Applicable
Compliances
RoHS Compliant CE Marked
Amperage Rating
350 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
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 → Business Impact → Application: The dual-element, time-delay design provides robust protection while tolerating motor inrush currents, reducing nuisance trips and improving line reliability for conveyor and pump systems. This translates to fewer unplanned outages and smoother startup sequences in production lines, especially in OEM-controlled machine suites and field-installed control panels. Feature → Business Impact → Application: With a 350 A amperage rating and a 300 kAIC interrupt capability at 250 VAC, it offers strong short-circuit protection for power distribution panels without compromising equipment during startup transients, making it suitable for motor drives, fans, and HVAC systems. Feature → Business Impact → Application: Blade-end x blade-end connection and standard packaging enable rapid, drop-in replacements in retrofit projects and legacy installations, supporting faster maintenance cycles and reduced downtime. Feature → Business Impact → Application: RoHS compliant and CE marked, this fuse aligns with global electrical safety and environmental standards, helping manufacturers meet compliance deadlines and audit requirements across regions. Feature → Business Impact → Application: The Class RK1 designation and current-limiting characteristics improve system selectivity, enabling designers to protect downstream devices while enabling upstream protection coordination in control panels and switchgear. Feature → Business Impact → Application: With 8.63 in length and 2.36 in height/width, the unit fits common fuse banks and supports compact enclosure designs, allowing tighter panel layouts and easier heat management in compact machines.
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FAQs
Install the LPN-RK-350SP as a drop-in blade-end device in compatible RK1 fuse blocks. Verify panel clearance, align the blades with the bus connections, and orient the fuse so the current path matches the circuit design. Ensure secure seating, then verify continuity before powering up. The standard 8.63 in length and 2.36 in width support common panel layouts and allow straightforward replacement during maintenance.
The fuse is rated for 350 A amperage, with an interrupt rating of 300 kAIC at 250 VAC and 100 kAIC at 250 VDC. Voltage rating is 250 VAC / 250 VDC, and it is a time-delay, dual-element, current-limiting device designed to cope with motor inrush without sacrificing protection against faults.
Yes. The LPN-RK-350SP is a time-delay, dual-element fuse designed to tolerate motor started inrush while providing current-limiting short-circuit protection. Its RK1 class and 350 A rating make it well-suited for motor drives, conveyors, and other rotating equipment where startup surges are common, helping to minimize nuisance trips while preserving circuit protection.
This Eaton Bussmann fuse is CE marked and RoHS compliant, supporting regulatory requirements for European and global markets. While not specified for SIL ratings, the device adheres to key environmental and safety standards, making it suitable for use in certified industrial control panels and equipment assemblies.
The fuse is a robust, non-indicating, 1-piece solution with standard packaging that simplifies stocking and replacement. Its current-limiting characteristics reduce fault propagation and downtime, lowering maintenance costs. With durable ratings and compatibility with standard RK1 blocks, you can expect longer service intervals in motor control applications and a clear return on investment through reduced unscheduled outages.