Eaton LPN-RK-1-1/8SP Fuse - Class RK1
Part Number: LPN-RK-1-1/8SP
Quick Summary
Eaton LPN-RK-1-1/8SP fuse is a time-delay, dual-element protector for motor-control circuits in industrial equipment. When inrush from motors or drives threatens nuisance trips, this design tolerates surge while maintaining robust protection downstream. The device is CE marked and follows Class RK1 protection; RoHS compliance can be checked via Eaton's RoHS search tool, with no SIL or IP ratings listed in the provided data. Beyond compliance, it offers reliable interrupting performance and a compact form factor that supports efficient panel layouts and standard RK1 installations, helping procurement reduce part complexity and stocking costs while preserving system integrity.
Product Information
Extended Description
LPN-RK-1-1/8SP Eaton: Eaton Bussmann Series Class RK1 fuse, LPN-RK, time-delay, dual-element, current limiting fuse, 1.125 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-1-1/8SP
UPC
051712538091
Product Length/Depth
2 in
Product Height
0.56 in
Product Width
0.56 in
Product Weight
0.03 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
1.125A
Interrupt rating
100 kAIC at 125 Vdc 300 kAIC at 250 Vac
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
Fuse indicator
Non-indicating
Quantity
10
Special features
Indicating, High in-rush current motor protection
Bussmann Full Line Catalog
Bussmann Full Line Catalog
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 construction enables controlled inrush handling without compromising short-circuit protection. Business Impact: Reduces nuisance tripping during motor start-up, improving equipment uptime and operator productivity. Application: Motor starters and drives in conveyors, pumps, and fans where startup surges occur. Feature: Current-limiting protection paired with a high interrupt rating. Business Impact: Fast fault clearing protects downstream components and wiring from damage, lowering maintenance costs. Application: Power distribution panels and control cabinets in demanding industrial environments. Feature: 1.125 A rating at 250 VAC / 125 VDC with dual elements. Business Impact: Precise protection for small-control circuits and sensor/comms modules, enabling safe, reliable operation. Application: Control circuits within machine mounts and panel boards. Feature: Class RK1, 2-in length, standard packaging. Business Impact: Seamless integration with existing Bussmann RK1 families and easy retrofit in legacy equipment. Application: Retrofit projects and new builds requiring standardized protection devices. Feature: Non-indicating body with high in-rush motor protection capability. Business Impact: Simplifies panel aesthetics while relying on control logic to monitor status, and supports high-inrush protection without misinterpretation of inrush events. Application: Automotive, packaging, and material handling equipment where clear indicators are not required. Industry context note: This fuse aligns with common industrial protection strategies for motor control, offering a balance of selectivity, speed, and ruggedness while keeping installation straightforward for technicians familiar with RK1-class devices. Overall, it supports preventive maintenance programs and inventory rationalization by fitting standard RK1 footprints in Eaton’s Bussmann series.
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FAQs
To install, confirm compatibility with RK1 fuse blocks and ensure the panel provides 250 VAC or 125 VDC circuits as rated. Insert the 2-inch long LPN-RK-1-1/8SP into a standard RK1 holder with proper mounting, secure wiring per the control schematic, and verify the circuit path against the rated amperage of 1.125A. After wiring, perform a controlled energize/test sequence to confirm protection and ensure no nuisance trips during normal motor inrush conditions.
The LPN-RK-1-1/8SP has an amperage rating of 1.125A. Its interrupt ratings are 300 kAIC at 250 VAC and 100 kAIC at 125 VDC, providing strong fault-clearing capability to protect downstream equipment during short-circuit events.
Yes. The time-delay, dual-element design is specifically intended for motor protection, tolerating the inrush associated with motor starts while maintaining circuit protection. This makes it well-suited for motor starters, drives, and other motor-control applications in industrial environments.
The LPN-RK-1-1/8SP is CE marked. RoHS compliance can be checked via Eaton's RoHS search tool. The provided data does not list SIL or IP ratings for this specific model, so verify any additional regulatory requirements with your project standards and Eaton technical resources.
Using this fuse can reduce downtime by minimizing nuisance trips during motor start-up, thanks to its time-delay design. Its compact RK1 form factor simplifies replacement and stocking (2 in length, standard packaging), while its high interrupt ratings protect critical components. Over time, this translates to lower maintenance costs and improved equipment availability.