Eaton LPS-RK-40SP Fuse - Class RK1, 600 Vac / 300 Vdc
Part Number: LPS-RK-40SP
Quick Summary
The LPS-RK-40SP fuse from Eaton provides reliable time-delay, current-limiting protection for industrial control panels and motor circuits. Selecting the right fuse can be the difference between uninterrupted production and costly downtime caused by nuisance trips on startup surges. This model is CE marked and belongs to the RK1 family, featuring a dual-element design for selective coordination and robust interrupting capability. With a 40 A rating and ferrule-end connections, it installs quickly in standard enclosures while supporting safety, compliance, and ease of maintenance. For engineers and procurement teams, the LPS-RK-40SP delivers predictable protection, simplified replacement, and clear cross-references to Bussmann catalogs for fast sourcing.
Product Information
Extended Description
LPS-RK-40SP Eaton: Eaton Bussmann Series Class RK1 fuse, LPS-RK, time-delay, dual-element, current limiting fuse, 40 A, non-indicating fuse, interrupting rating of 300 kA at 600 Vac and 100 kA at 300 Vdc
Product Name
Eaton Bussmann series LPS-RK fuse
Catalog Number
LPS-RK-40SP
UPC
051712548380
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
300 kAIC at 600 Vac 100 kAIC at 300 Vdc
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
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 design from the LPS family. Business Impact: Tolerates inrush currents without nuisance tripping, reducing unnecessary process stops and equipment wear. Application: Motor starters and drives in automation panels benefit from steadier operation. Feature: 40 A amperage rating with a 300 kAIC interrupt rating at 600 Vac and 100 kAIC at 300 Vdc. Business Impact: Higher fault-current withstands protect delicate downstream components and enables selective coordination. Application: Heavy-duty industrial circuits in conveyors and CNC machines. Feature: Ferrule-end x ferrule-end connection with electrically isolated end caps. Business Impact: Safer, faster field installation and safer maintenance, minimizing arc exposure and miswiring risk. Application: Control panels and switchgear assemblies where quick, reliable terminations are needed. Feature: Class RK1, non-indicating fuse in a standard packaging format (5.5 in length, 1.06 in width, 2.6 lb). Business Impact: Consistent form-factor supports plug-and-play cross-reference with Bussmann catalogs, reducing engineering time and stocking complexity. Application: Industrial enclosures requiring compact, repeatable protection components. Feature: 600 Vac / 300 Vdc voltage rating with rapid yet controlled response. Business Impact: Clear safety margin for mixed-AC/DC environments; helps meet machine safety and electrical codes. Application: Power distribution panels and mixed-supply equipment in manufacturing facilities.
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FAQs
When retrofitting LPS-RK-40SP into existing panels, verify panel cutouts and busbar spacing align with the 5.5 inch length and ferrule-end connections. Ensure the device is mounted in a secure, ventilated area and that end caps are properly seated to maintain electrical isolation. Use the standard packaging quantities to simplify stocking and cross-referencing with Bussmann catalogs.
The LPS-RK-40SP provides 300 kAIC interrupt rating at 600 Vac and 100 kAIC at 300 Vdc, which defines the maximum short-circuit current the fuse can interrupt safely. This protects downstream equipment from catastrophic fault currents, supports selective coordination, and helps prevent collateral damage to drives and controllers in heavy-duty applications.
Yes, the LPS-RK-40SP is designed for motor protection in industrial environments. Its time-delay characteristic accommodates motor inrush while its current-limiting capability helps limit fault energy. For three-phase configurations, ensure proper panel wiring, verification of phase balance, and coordination with other protective devices to achieve reliable motor protection and reduced downtime.
The LPS-RK-40SP is CE Marked, indicating compliance with relevant European safety standards. Other certifications such as SIL or IP ratings are not specified in the provided data. When designing for regulated environments, confirm project requirements and consult Eaton's data sheets for any additional certification recertifications or region-specific compliance requirements.
Maintenance planning centers on periodic inspection of the fuse link and end-cap integrity during routine panel checks. Replacement should follow observed fuse performance and downtime history; time-delay fuses like LPS-RK-40SP help reduce nuisance trips, improving uptime and process reliability. The predictable cross-reference with Bussmann catalogs streamlines procurement, lowering total cost of ownership over lifecycle of control panels.