Eaton LPS-RK-125SPI Fuse - Class RK1, 600 Vac
Part Number: LPS-RK-125SPI
Quick Summary
Eaton LPS-RK-125SPI Fuse provides reliable time-delay protection for motor and power-distribution panels in industrial environments. For engineers, nuisance trips and downtime often stem from misaligned protection and fast-changing loads; this dual-element, current-limiting design helps minimize those events while guarding critical equipment. This model is CE marked and part of the RK1 family, aligning with common safety standards and ensuring interchangeability within Bussmann RK1 protected circuits; note that SIL and IP ratings are not specified in this data. With a 125 A rating at 600 Vac, it delivers robust protection without sacrificing service continuity in demanding applications.
Product Information
Extended Description
LPS-RK-125SPI Eaton: Eaton Bussmann Series Class RK1 fuse, LPS-RK, time-delay, dual-element, current limiting fuse, 125 A, indicating fuse, interrupting rating of 300 kA at 600 Vac
Product Name
Eaton Bussmann series LPS-RK fuse
Catalog Number
LPS-RK-125SPI
UPC
051712626934
Product Length/Depth
9.63 in
Product Height
1.61 in
Product Width
1.61 in
Product Weight
2 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
125 A
Interrupt rating
300 kAIC at 600 Vac 100 kAIC at 300 Vdc
Voltage rating
600 Vac, 300 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 With Indicator
Quantity
1
Special features
Electrically isolated end cap
Bussmann Full Line Catalog
Bussmann Full Line Catalog
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Bussmann series Fuseology
Bussmann series Low-Peak 600 V LPS Class RK1 time-delay fuses, 70-600 A data sheet no. 1002
Feature: Time-delay, dual-element design. Benefit: Provides coordinated protection for motors and control circuits, reducing nuisance trips during motor start-up and inrush events. Application: Motor drives, pump packages, and equipment with variable loads. Feature: 125 A amperage rating at 600 Vac. Benefit: Suitable for mid-to-high current circuits common in industrial panels, enabling reliable protection without oversizing. Application: Power distribution buses, panelboards, and MCCs. Feature: Current-limiting capability. Benefit: Limits let-through energy during fault conditions, improving fault arc suppression and downstream component protection. Application: Control cabinets and feeders where safety and uptime are critical. Feature: 300 kAIC interrupt rating at 600 Vac. Benefit: High surge capability supports robust protection in densely loaded systems. Application: Large commercial/industrial panels and equipment with high short-circuit energy. Feature: Blade end x blade end connection and electrically isolated end cap. Benefit: Fast, secure installation with enhanced safety during maintenance. Application: Retrofit or new installations in standard Bussmann RK1 configurations. Feature: Class RK1 designation and CE compliance. Benefit: Proven compatibility with RK1 families and global safety standards. Application: Industrial protection, panel assemblies, and cross-reference stocking.
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FAQs
Yes. The LPS-RK-125SPI uses blade end x blade end connections and is designed for easy drop-in replacement within Bussmann RK1 protected circuits. It aligns with Class RK1 specifications and standard industrial panelboard configurations, simplifying stocking and maintenance while ensuring reliable circuit protection.
The fuse is rated 125 A with a voltage rating of 600 Vac (and 300 Vdc). It offers a 300 kAIC interrupt rating at 600 Vac and 100 kAIC at 300 Vdc, plus time-delay, current-limiting characteristics. Dual-element construction provides improved coordination and protection for motors and power circuits in demanding environments.
Yes. Its time-delay, dual-element design and current-limiting capability minimize nuisance trips during motor start-up while providing robust short-circuit protection. The 125 A rating and high interrupt capacity make it appropriate for motor control centers, pumps, and other high-inrush applications common in industrial facilities.
The LPS-RK-125SPI is CE marked, indicating conformity with European safety standards. It belongs to the RK1 class family, which is widely used in industrial protection schemes. Specific SIL or IP ratings are not listed in the provided data; verify system-level requirements and refer to the latest Eaton datasheet for updates.
Leverage its standard packaging and blade-end connections for quick replacement and minimal downtime. The electrically isolated end cap enhances safety during maintenance, and its compatibility with the RK1 ecosystem simplifies stocking and cross-referencing. Using this fuse can reduce downtime from nuisance trips and support longer mean-time-between-failures (MTBF) in protected power circuits.