Eaton LPS-RK-125SP-TP Fuse - RK1 Time-Delay
Part Number: LPS-RK-125SP-TP
Quick Summary
The LPS-RK-125SP-TP fuse protects electrical circuits with time-delay, current-limiting action in control panels and motor drives. Engineers often struggle with nuisance trips during startup surges and selecting a device that tolerates inrush without compromising protection. This fuse leverages Class RK1 construction and RoHS compliance to meet demanding industrial standards, while offering high interrupt ratings for robust protection. In practice, it supports reliable panel protection, reduces unplanned downtime, and simplifies procurement by aligning with standard Bussmann RK1 form factors. By combining strong electrical performance with industry-standard packaging, it also enables faster installation, easier maintenance, and long-term cost efficiency in industrial environments.
Product Information
Extended Description
LPS-RK-125SP-TP Eaton: Eaton Bussmann series LPS-RK fuse, Low-peak fuse, 125 A, RK1, Non-indicating, Time delay, Current-limiting, 100 kAIC at 300 Vdc, 300 kAIC at 600 V, Tin-plated, Standard, 600 V, 300 Vdc
Product Name
Eaton Bussmann series LPS-RK fuse
Catalog Number
LPS-RK-125SP-TP
UPC
051712752435
Product Length/Depth
9.63 in
Product Height
1.61 in
Product Width
1.61 in
Product Weight
2 lb
Warranty
Not Applicable
Compliances
RoHS Compliant
Amperage Rating
125 A
Interrupt rating
100 kAIC at 300 Vdc 300 kAIC at 600 Vac
Voltage rating
600 V, 300 Vdc
Fuse type
Time delay Current-limiting
Material
Tin-plated
Packaging type
Standard
Class
Class RK1
Fuse indicator
Non-indicating
LPS-RK-125SP-TP~CLASS RK1 FUSE TIN PLATED
LPS-RK-125SP-TP~CLASS RK1 FUSE TIN PLATED
Bussmann series Fuseology
Eaton Specification Sheet - LPS-RK-125SP-TP
Feature → Business Impact → Application: Time-delay, current-limiting design reduces nuisance trips during motor startups, improving line uptime and productivity in robotics and conveyor systems. Application: Industrial control panels, power distribution blocks, and motor drives benefit from predictable startup current handling and safer fault isolation. Feature → Business Impact → Application: Tin-plated contacts and corrosion resistance extend connector life in harsh environments, lowering maintenance costs and replacement cycles. Application: Panels in manufacturing cells and outdoor equipment racks where exposure to moisture and dust is common. Feature → Business Impact → Application: 125 A rating with 600 V and 300 Vdc support enables use in high-demand circuits while maintaining fast fault clearing, reducing damage to downstream components. Application: Heavy-duty protection for feeders and distributed loads. Feature → Business Impact → Application: Class RK1 construction ensures standardized interchangeability with Bussmann RK1 families, speeding spares provisioning and field swaps. Application: Retrofit projects and new builds requiring common fuse types. Feature → Business Impact → Application: RoHS compliance aids procurement for regulated environments, simplifying supplier audits and sustainability reporting. Application: Automotive and electronics manufacturing facilities seeking compliant protection devices. This content emphasizes compatibility with standard fuse holders, installation advantages, and measurable outcomes like uptime and maintenance cost reductions.
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FAQs
The LPS-RK-125SP-TP is designed for standard Bussmann RK1 fuse holders with compatible mounting and form factor. Its 9.63 in length and 1.61 in dimensions align with common RK1 trays, simplifying retrofit and new panel builds. Field swaps are streamlined due to familiar packaging and PCB/panel mounting footprint.
It combines a time-delay characteristic with current-limiting protection, allowing brief startup surges without tripping while preventing damaging fault currents. Use it in circuits with motors, drives, and power supplies where startup inrush is expected but rapid fault interruption is required to protect wiring and components.
Yes. The LPS-RK-125SP-TP is rated for 600 V AC and 300 V DC, with interrupt ratings up to 300 kAIC at 600 Vac and 100 kAIC at 300 Vdc, enabling protection across mixed supply environments commonly found in industrial equipment.
This fuse is RoHS compliant and classified as Class RK1, aligning with standard industry practices for reliable, interchangeable protection devices. While specific certifications like CE or SIL are not listed in the provided data, the RoHS and RK1 classification support robust compliance in many industrial contexts.
The fuse’s high interrupt ratings and current-limiting behavior reduce equipment damage from faults and minimize nuisance trips, which lowers unplanned downtime and maintenance costs. Standardized RK1 compatibility also reduces spare-part inventories and speeds field service, contributing to a favorable total cost of ownership in motor drive applications.