Eaton LPS-RK-125SP Fuse - Class RK1, Time-Delay
Part Number: LPS-RK-125SP
Quick Summary
LPS-RK-125SP fuse from Eaton provides reliable overcurrent protection for control panels and motor circuits in industrial environments. Engineers routinely face nuisance trips, tight spaces, and the challenge of balancing fast interruption with selectivity in compact automation cabinets. CE marked and Class RK1 compliant, this time-delay dual-element fuse is designed to meet global safety standards while supporting standard blade-end connections. With a 125 A rating at 600 Vac and 300 Vdc, it delivers high fault protection, reduces downtime, and simplifies panel design for industrial applications. Designed to streamline procurement and field replacement, it offers compatibility with Eaton Bussmann RK1 products and leverages a compact, non-indicating form factor.
Product Information
Extended Description
LPS-RK-125SP Eaton: Eaton Bussmann Series Class RK1 fuse, LPS-RK, time-delay, dual-element, current limiting fuse, 125 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-125SP
UPC
051712548472
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
Quantity
1
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, 70-600 A data sheet no. 1002
Feature is a time-delay, dual-element, current-limiting design that protects sensitive loads while accommodating motor inrush. Business impact is improved selectivity and reduced nuisance trips, leading to longer equipment life and lower maintenance costs. Application: ideal for control panels, conveyors, and machine drives in manufacturing lines where inrush is common and reliability is critical. Feature continues with a Class RK1, blade-end connection, and standard packaging, enabling easy swap-ins in existing RK1 layouts and minimizing downtime during maintenance. Business impact: faster installation, safer maintenance, and reduced spare-part diversity. Application: retrofit projects and new builds across industrial automation. Feature highlights a 125 A rating with 600 Vac / 300 Vdc operation and high interrupt ratings (300 kAIC at 600 Vac; 100 kAIC at 300 Vdc), delivering robust fault protection while enabling compact, compliant panel design. Application: telecom racks, process lines, and HVAC control panels.
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FAQs
The LPS-RK-125SP uses standard blade-end terminations compatible with Eaton Bussmann RK1 fuse holders. To install, power down the panel, remove the previous fuse if present, and seat the new LPS-RK-125SP firmly in the blade-end slots to ensure a solid electrical contact. Verify the connection orientation matches the blade-end configuration and that the mounting space accommodates the 9.63 in length. Replacement with another LPS-RK-125SP preserves time-delay characteristics and current-limiting performance, maintaining system protection without requiring special adapters.
Key ratings include 125 A amperage, 600 Vac / 300 Vdc voltage ratings, and a 300 kAIC interrupt rating at 600 Vac plus 100 kAIC at 300 Vdc. This makes the LPS-RK-125SP suitable for motor loads, drives, and control circuits that experience inrush currents but require reliable interruption during faults. Its time-delay element supports short-time overloads typical of motor starting, while the current-limiting feature helps protect downstream components from damaging surge energy.
Yes. The LPS-RK-125SP is purpose-built for motor protection in manufacturing and material-handling environments. Its dual-element time-delay design tolerates inrush, while the 125 A rating and high interrupt capability provide robust protection for motor starters, contactors, and drives connected to 600 Vac systems. It fits RK1-class panel architectures, enabling selective protection and reducing the risk of nuisance trips in high-load scenarios.
This fuse is CE marked, indicating compliance with pertinent European safety directives, and it belongs to the Class RK1 family, aligning with established fuse classifications. These certifications matter for audits because they validate conformity with electrical safety requirements and standard protection practices used in industrial control panels, manufacturing lines, and multi-national facilities, helping streamline regulatory approvals and supplier qualification processes.
The LPS-RK-125SP reduces downtime by delivering reliable protection with a time-delay response that tolerates motor inrush without unnecessary tripping. Its standardized RK1 blade-end design simplifies part sourcing and field replacement, lowering spare-parts inventory. The robust interrupt ratings and CE compliance support longer service life in demanding environments, contributing to lower total cost of ownership through fewer unplanned outages and easier maintenance planning.