Eaton LPN-RK-35SP Fuse - Class RK1 Time-Delay
Part Number: LPN-RK-35SP
Quick Summary
Eaton LPN-RK-35SP fuse provides robust overcurrent protection for motor and drive circuits in industrial equipment. Engineers often confront nuisance trips during startup and inrush events, which can disrupt production and escalate maintenance costs. This time-delay, dual-element, current-limiting fuse helps keep equipment online by coordinating short-circuit protection with motor inrush. Designed to CE Marked standards and built as Class RK1, it delivers reliable performance in harsh industrial environments. The compact 3 in length, 0.81 in height and 0.81 in width fits standard enclosures, while delivering 35 A protection with a 300 kAIC interrupt rating at 250 VAC. With ferrule-end connections and a non-indicating indicator, installation and diagnostics remain straightforward, supporting efficient procurement and service planning.
Product Information
Extended Description
LPN-RK-35SP Eaton: Eaton Bussmann Series Class RK1 fuse, LPN-RK, time-delay, dual-element, current limiting fuse, 35 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-35SP
UPC
051712538374
EAN
5027590277945
Product Length/Depth
3 in
Product Height
0.81 in
Product Width
0.81 in
Product Weight
1.2 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
35 A
Interrupt rating
100 kAIC at 250 Vdc 300 kAIC at 250 Vac
Response time
10 sec at 500%
Voltage rating
250 Vac, 250 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: Time-delay, dual-element, current-limiting design. Benefit: Reduces nuisance trips during motor startup and high inrush, improving uptime and productivity in conveyors, pumps, and HVAC drives. Application: Ideal for motor control centers and panel boards where reliable inrush tolerance is essential. Feature: 35 A amperage rating with high interrupt capability. Benefit: Protects downstream wiring and equipment while tolerating surge currents common in industrial loads, minimizing damage while preserving short-circuit protection. Application: Motor protective devices and power distribution sections in manufacturing lines. Feature: Class RK1 with ferrule-end connections. Benefit: Easy installer integration with standard Bussmann fuse holders and chassis, reducing service time and wiring errors. Application: Retrofit projects and new builds in compact electrical cabinets. Feature: Time-delay operation with 10 seconds at 500% response. Benefit: Aligns with motor inrush curves, reducing nuisance tripping and allowing safe startup sequences. Application: Start-up routines for large motors, fans, and pump systems. Feature: Dual-element, non-indicating fuse. Benefit: High reliability with straightforward diagnostics and low visual clutter in control panels. Application: Control circuits in automated lines and HVAC equipment where clear status indicators are not required. Feature: 300 kAIC rating at 250 VAC and 100 kAIC at 125 VDC. Benefit: Superior fault tolerance, meeting the demands of demanding industrial power systems. Application: Heavy-duty circuits in machine tools, presses, and material handling systems. Feature: Compact footprint with standard packaging (3 in x 0.81 in x 0.81 in, 10 pcs). Benefit: Easy stocking, shipping, and crew-friendly replacement in limited spaces. Application: Warehouse automation and compact electrical rooms where space is at a premium. Additional context: This fuse is part of Eaton Bussmann's low voltage branch circuit protection family and supports compliance with CE standards while delivering reliable motor protection for inrush-prone applications.
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FAQs
The LPN-RK-35SP uses ferrule-end connections, which simplify crimping and secure bonding into standard Bussmann fuse holders. Ensure the enclosure supports Class RK1 fuses and that the conductor gauges match the ferrule terminals. Use the standard packaging quantity of 10 pieces for stocking, and verify the 3 in length and 0.81 in footprint fit within the panel space.
Key ratings include 35 A amperage, voltage rating of 250 VAC and 250 VDC, and an interrupt rating of 300 kAIC at 250 VAC and 100 kAIC at 125 VDC. These specs mean the fuse can safely interrupt high fault currents in AC circuits and provide robust protection for DC loads, while accommodating both motor and control circuit applications.
Yes. The fuse is time-delay and dual-element, designed to tolerate motor inrush without nuisance tripping while still providing rapid response to short circuits. Its 10 sec at 500% response time specification helps align protection with motor startup profiles, reducing downtime in conveyors, pumps, and fans.
The product is CE Marked, indicating compliance with European safety and performance standards. The RK1 class designation also informs compatibility with Bussmann RK1-fuse holders and related protection schemes in low-voltage circuits.
The LPN-RK-35SP reduces downtime by minimizing nuisance trips and protecting motor circuits from damaging faults. Its high interrupt rating and reliable current-limiting behavior lower repair costs and extend equipment life, delivering a favorable return on investment through improved uptime and predictable maintenance planning.