Eaton LPS-RK-40SPI Fuse - Class RK1, 600 Vac
Part Number: LPS-RK-40SPI
Quick Summary
The Eaton Bussmann LPS-RK-40SPI fuse protects control and power circuits in industrial panel applications. Engineers often struggle with nuisance trips and slow fault isolation when using general-purpose fuses, leading to unplanned downtime. This device adheres to CE Marked compliance and belongs to the Class RK1 family, combining time-delay operation with dual-element current-limiting for reliable protection under 600 Vac systems. Its 40 A rating, 5.5 in length, ferrule-end connections, and standard packaging simplify panel design, while enabling scalable protection across automation and power distribution. By aligning with RK1 standards and European safety requirements, it supports consistent performance in demanding industrial environments and buys manufacturers meaningful gains in uptime and maintainable protection strategies.
Product Information
Extended Description
LPS-RK-40SPI Eaton: Eaton Bussmann Series Class RK1 fuse, LPS-RK, time-delay, dual-element, current limiting fuse, 40 A, indicating fuse, interrupting rating of 300 kA at 600 Vac
Product Name
Eaton Bussmann series LPS-RK fuse
Catalog Number
LPS-RK-40SPI
UPC
051712626279
Product Length/Depth
5.5 in
Product Height
1.06 in
Product Width
1.06 in
Product Weight
2.6 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
40 A
Interrupt rating
100 kAIC at 300 Vdc 300 kAIC at 600 Vac
Response time
10 sec at 500%
Voltage rating
600 Vac, 300 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 With Indicator
Quantity
10
Special features
Electrically isolated end cap
Low Voltage Branch Circuit Fuse Chapter
Low Voltage Branch Circuit Fuse Chapter
RoHS Search Tool
Bussmann series Fuseology
Bussmann series Low-Peak 600 V LPS Class RK1 time-delay fuses, up to 600 A data sheet no. 1001
Feature: Time-delay, dual-element, current-limiting design. Benefit: Handles motor inrush and startup surges without nuisance tripping, while limiting fault current to minimize arc energy and protect wiring. Application: Ideal for automation panels and drive protection in machine-building environments. Feature: 40 A rating with 600 Vac and 300 Vdc voltage ratings. Benefit: Provides precise protection for mid-range power circuits with wide AC and DC tolerance, enabling safer and more reliable control cabinets. Application: Panel boards and power distribution centers in manufacturing plants. Feature: Class RK1 and ferrule end x ferrule end connections. Benefit: Standards-aligned protection with straightforward, proven terminations, reducing installation time and commissioning risk. Application: Retrofit projects and new builds requiring quick, secure expansion in EK1/RK1 families. Feature: Interruption ratings up to 300 kAIC at 600 Vac and 100 kAIC at 300 Vdc. Benefit: High fault protection for heavy-duty systems and critical loads, improving safety margins and minimizing downtime during faults. Application: Large electrical panels and feeder circuits in process automation. Feature: Electrically isolated end caps and standard packaging. Benefit: Improves safety during maintenance and simplifies stocking with ten-piece lots for predictable procurement. Application: OEM assembly lines and field service logistics where consistency matters.
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FAQs
The LPS-RK-40SPI uses ferrule end x ferrule end terminations designed for standard RK1 holders. Mount it in compatible fuse blocks within industrial control panels, ensuring clean, secure ferrule terminations. Verify the 5.5 in length and 1.06 in width fit your enclosure, and follow manufacturer torque recommendations for ferrule connections to maintain optimal fault clearing and reliability.
Key ratings include a 40 A amperage rating, 600 Vac and 300 Vdc voltage ratings, and an interruption rating up to 300 kAIC at 600 Vac (and 100 kAIC at 300 Vdc). It is a time-delayed, dual-element, current-limiting fuse with a 10 s response at 500% overload, designed to protect circuits while tolerating inrush currents.
Yes. The LPS-RK-40SPI is rated for 600 Vac and uses RK1-class construction with dual elements and time-delay characteristics, making it suitable for motor protection and other control-panel applications in industrial automation where reliable fault clearance and controlled startup are essential.
The fuse is CE marked, indicating compliance with European safety directives. It belongs to the Class RK1 family, which provides standardized performance characteristics for fast and predictable protection in industrial circuits. This alignment supports regulatory and safety expectations in many international installations.
By combining time-delay operation with current-limiting, the LPS-RK-40SPI reduces nuisance trips during startup while protecting against arc energy during faults, contributing to higher equipment uptime. Standard RK1 form factor and 10-piece packaging streamline procurement, stocking, and maintenance planning for panel builders and OEMs.