Eaton LPN-RK-125SP Fuse - Class RK1, 125A Time-Delay
Part Number: LPN-RK-125SP
Quick Summary
LPN-RK-125SP fuse by Eaton delivers time-delay, current-limiting protection for motor circuits in industrial equipment. Maintenance teams frequently battle nuisance trips and undersized interrupt ratings that derail production schedules. This Class RK1 dual-element device is RoHS compliant and CE marked, designed for control panels, drives, and distribution networks. Choosing the right fuse reduces unplanned downtime, protects wiring and components, and simplifies fault isolation across critical manufacturing lines. With its standard packaging and blade end connections, installation aligns with common Bussmann lineups, easing replacement in legacy cabinets. The 125 A rating and high interrupt capabilities support safe operation in demanding industrial environments.
Product Information
Extended Description
LPN-RK-125SP Eaton: Eaton Bussmann Series Class RK1 fuse, LPN-RK, time-delay, dual-element, current limiting fuse, 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-125SP
UPC
051712538473
Product Length/Depth
7.13 in
Product Height
1.61 in
Product Width
1.61 in
Product Weight
0.69 lb
Warranty
Not Applicable
Compliances
RoHS Compliant CE Marked
Amperage Rating
125 A
Interrupt rating
300 kAIC at 250 Vac 100 kAIC at 250 Vdc
Voltage rating
250 Vac, 250 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
Indicating, High in-rush current motor protection
Bussmann series Class J Low-Peak fuse 70-600A data sheet No. 1007
Bussmann Full Line Catalog
Bussmann Full Line Catalog
RoHS Search Tool
Bussmann series Fuseology
Feature: Time-delay, dual-element design → Business Impact: Accommodates motor inrush and startup surges without nuisance tripping while maintaining current limitation to protect conductors → Application: Motor starters, drives, and conveyors in industrial plants. The result is improved line availability and reduced maintenance calls. Feature: 125 A amperage with 300 kAIC at 250 Vac and 100 kAIC at 125 Vdc interrupt ratings → Business Impact: Strong fault clearance protects wiring, controllers, and downstream devices during short circuits, lowering damage costs → Application: Control panels and branch circuits in heavy electrical environments. Feature: Class RK1, blade end x blade end connections, standard packaging → Business Impact: Quick, reliable drop-in replacement in existing fuse holders reduces downtime during maintenance → Application: Retrofit and new installations in standard Bussmann RK1 inventories. Feature: RoHS compliant and CE marked → Business Impact: Simplified regulatory compliance and green manufacturing practices → Application: Global deployments in compliant facilities. Feature: Special features include indicating option and high in-rush current motor protection → Business Impact: Enhanced fault diagnosis and suitability for high-inrush loads reduces over-tripping risk and improves motor protection decisions → Application: Industrial motors, pumps, and HVAC drives in mission-critical lines.
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FAQs
LPN-RK-125SP is designed with blade end x blade end connections and standard RK1 packaging, making it compatible with common Bussmann RK1 fuse holders and control-panel assemblies. It fits standard cabinet layouts and replacement strategies, enabling straightforward upgrades in legacy equipment and new builds alike.
The fuse is rated for 125 A with an interrupt rating of 300 kAIC at 250 Vac and 100 kAIC at 125 Vdc. It supports a voltage rating of 250 Vac or 250 Vdc and uses time-delay, dual-element construction to balance startup surges with effective protection in industrial circuits.
Yes. The LPN-RK-125SP is RoHS compliant and CE marked, ensuring compatibility with stringent environmental and safety requirements. This helps facilities meet regulatory standards while maintaining supplier and product traceability across multi-region deployments.
Yes. The fuse features time-delay, dual-element construction and is specified for high inrush protection, making it suitable for motors and drives with brief startup surges. This reduces nuisance trips while maintaining robust overcurrent protection for motor circuits.
Plan for blade end x blade end connections in RK1-compatible holders, with 7.13 in length and 1.61 in cross-section. Use standard packaging for straightforward replacement in existing cabinets. The non-indicating indicator variant is noted, with special features highlighting motor protection for high in-rush scenarios.