Eaton LPN-RK-40SPI Fuse - RK1 Time-Delay, 40A, 300 kAIC
Part Number: LPN-RK-40SPI
Quick Summary
Eaton LPN-RK-40SPI fuse provides time-delay protection for motor circuits in industrial equipment. This design helps prevent nuisance trips during rapid motor startups and reduces downtime in critical processes. It carries CE marking and is part of the RK1 class family, offering reliable in-panel protection for demanding environments. Designed for control panels and motor drives, it complements Bussmann RK1 offerings and supports efficient, standards-compliant protection strategies.
Product Information
Extended Description
LPN-RK-40SPI Eaton: Eaton Bussmann Series Class RK1 fuse, LPN-RK, time-delay, dual-element, current limiting fuse, 40 A, indicating fuse, interrupting rating of 300 kA at 250 Vac
Product Name
Eaton Bussmann series LPN-RK fuse
Catalog Number
LPN-RK-40SPI
UPC
051712626705
Product Length/Depth
3 in
Product Height
0.81 in
Product Width
0.81 in
Product Weight
0.15 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
40 A
Interrupt rating
300 kAIC at 250 Vac 100 kAIC at 125 Vdc
Response time
10 sec at 500%
Voltage rating
250 Vac, 125 Vdc
Fuse type
Time delay Current-limiting
Number of elements
Dual
Packaging type
Standard
Class
Class RK1
Fuse indicator
Non-indicating With Indicator
Quantity
10
Special features
Indicating, High in-rush current motor protection
Bussmann Full Line Catalog
Bussmann Full Line Catalog
RoHS Search Tool
Bussmann series Fuseology
Bussmann series Low-Peak 250 V LPN Class RK1 time-delay fuses,1/10-60 A data sheet no. 1003
The LPN-RK-40SPI combines time-delay operation with a dual-element, current-limiting design to tolerate motor inrush without sacrificing protection. This reduces nuisance tripping and maintenance downtime in automated systems, especially where motors experience short-term overloads during startup. The fuse is rated at 40 A with a 300 kAIC interrupt rating at 250 VAC, enabling robust protection for feeders and control circuits in panels and switchgear. A dual-element construction provides improved reliability against short circuits, while the indicated 10-second response at 500% overload helps maintain selective protection in motor-driven loads. The option for an indicating fuse status supports easier preventative maintenance and faster fault diagnosis. Its compact 3 in length and 0.81 in width/height, along with standard packaging, simplifies retrofit in existing enclosures. The CE compliance and inclusion in the Bussmann RK1 family streamline sourcing for engineers and procurement teams, ensuring consistent performance across motor protection schemes. Overall, the LPN-RK-40SPI delivers measurable efficiency gains, reduced downtime, and safer operating margins in industrial automation environments.
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FAQs
Install the LPN-RK-40SPI into standard RK1 fuse holders within motor control cabinets or panel boards. Ensure the panel voltage matches 250 VAC or 125 VDC where applicable, and observe proper clearances. The fuse is available in standard packaging of 10 units, with the option for indicating or non-indicating variants to suit panel status monitoring.
The LPN-RK-40SPI provides an interrupt rating of 300 kAIC at 250 VAC, enabling robust protection for feeders and motor circuits against catastrophic short circuits while maintaining selective protection in upstream devices.
Yes. The fuse is rated for 250 VAC and 125 VDC, making it versatile for control panels that may power motor starters at AC and DC conditions. The dual-element design supports reliable performance across these voltage classes.
Yes. The LPN-RK-40SPI is available with an indicating option to show fuse status, which simplifies preventive maintenance and fault diagnosis in busy automation environments.
RK1 time-delay fuses tolerate motor inrush currents due to their dual-element design and time-delay characteristic, which minimizes nuisance trips. They provide current-limiting protection to limit arc energy, while maintaining rapid interruption during faults, making them ideal for motor starters, control panels, and automation cabinets.