Eaton KWS-R-25 Fuse - Class RK1, 25A, 100 kAIC
Part Number: KWS-R-25
Quick Summary
The KWS-R-25 fuse from Eaton protects PV systems and electrical panels with reliable overcurrent protection. In real-world installations, nuisance trips and mismatched fuses disrupt production and complicate maintenance. CE marked compliance and Class RK1 compatibility help ensure safe integration into existing Bussmann RK1 fuse blocks, while the high interrupt ratings provide fast fault clearance. This fuse is a compact, standard-packaged solution: 25 A, 600 Vac/600 Vdc, non-indicating, and designed for photovoltaic inverters and panelboards. By combining robust protection with straightforward installation, it reduces downtime, extends component life, and lowers total cost of ownership for industrial solar and distributed-energy applications.
Product Information
Extended Description
KWS-R-25 Eaton: Eaton Bussmann series KWS-R fuse, Photovoltaic systems, Inverters, Panelboards, 25 A, Class RK1, Non-indicating, 100 kAIC at 600 Vdc, 200 kAIC at 600 Vac, Standard
Product Name
Eaton Bussmann series KWS-R fuse
Catalog Number
KWS-R-25
UPC
051712658799
EAN
5027590104296
Product Length/Depth
0.8 in
Product Height
4.99 in
Product Width
0.8 in
Product Weight
0.13 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
25 A
Interrupt rating
100 kAIC at 600 Vdc 200 kAIC at 600 Vac
Voltage rating
600 Vac, 600 Vdc
Packaging type
Standard
Class
Class RK1
Fuse indicator
Non-indicating
Bussmann series complete full line catalog no. 1007
Bussmann series Fuseology
Eaton Specification Sheet - KWS-R-25
Bussmann series 250Vac/dc KWN-R and 600Vac/dc KWS-R Data Sheet No. 10413
Datasheet - FNQ-30
Feature: 25 A rating with 100 kAIC at 600 Vdc and 200 kAIC at 600 Vac. Business Impact: Delivers robust protection against high-energy faults, reducing equipment damage and service interruptions. Application: Ideal for PV inverters, string combiner boxes, and distribution panels, where strong fault currents are possible. Feature: Class RK1 designation. Business Impact: Ensures compatibility with standard Bussmann RK1 fuse blocks, enabling quick retrofits and predictable protection schemes. Application: Best for retrofit projects and new builds requiring RK1 conformance in industrial power distribution. Feature: 600 Vac / 600 Vdc ratings. Business Impact: Supports both AC and DC protection within a single device, simplifying inventory and maintenance. Application: PV system inverters, panelboards, and mixed-technology enclosures where DC protection on the PV side is critical. Feature: Non-indicating, standard packaging. Business Impact: Reduces visual clutter in crowded enclosures and streamlines stock management. Application: Installed across compact electrical cabinets and modular protection blocks. Feature: Compact form factor (0.8 in x 0.8 in x 4.99 in) and lightweight (0.13 lb). Business Impact: Eases mounting in tight spaces and minimizes enclosure modification. Application: Inverter housings, field retrofit panels, and space-constrained protection assemblies. Feature: CE Marked and Bussmann series lineage. Business Impact: Supports regulatory compliance and proven performance with legacy RK1 systems. Application: European installations and cross-compatible renewables projects requiring verified safety standards.
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FAQs
Yes. The KWS-R-25 uses the standard Bussmann RK1 form factor, enabling drop-in compatibility with RK1 fuse blocks and common panelboard assemblies. Its dimensions align with typical retrofit installs (about 0.8 in x 0.8 in x 4.99 in) and standard packaging, allowing straightforward field replacements without enclosure redesigns.
The fuse is rated for 25 A with interrupt ratings of 100 kAIC at 600 Vdc and 200 kAIC at 600 Vac. It supports both DC and AC protection at 600 V, making it suitable for PV inverters, panelboards, and mixed electrical environments on-site.
Primarily designed for photovoltaic systems, inverters, and distribution panels, the KWS-R-25 provides robust overcurrent protection in solar installs. It also suits other RK1-compatible protection schemes in industrial power distribution, where reliable DC and AC fault handling is essential.
The KWS-R-25 is CE marked and falls within the Bussmann series RK1 family, ensuring compatibility with established safety standards. Its non-indicating design simplifies installation in dense enclosures while maintaining regulatory compliance for European and other international deployments.
By delivering reliable, high-current fault protection with fast clearance, the KWS-R-25 minimizes unplanned downtime and reduces inverter and panelboard wear. Its compact form factor and RK1 compatibility simplify upgrades and replacements, lowering maintenance labor costs and extending system life for solar and distributed-energy projects.