Eaton KWS-R-50 fuse - Class RK1 & 600 Vac/600 Vdc
Part Number: KWS-R-50
Quick Summary
Eaton KWS-R-50 fuse provides fast-acting overcurrent protection for PV systems, inverters, and panelboards in commercial installations. The challenge many engineers face is selecting a device that meets both high voltage and DC protection requirements without nuisance tripping. This fuse carries CE marking and uses a Class RK1 design, with interrupt ratings up to 200 kAIC at 600 Vac and 100 kAIC at 600 Vdc. By combining robust protection with easy integration into standard fuse blocks, it supports reliable, code-compliant PV system deployment. In addition to its core protections, it aligns with common industry practices for renewable energy installations and simplifies procurement for power electronics projects.
Product Information
Extended Description
KWS-R-50 Eaton: Eaton Bussmann series KWS-R fuse, Photovoltaic systems, Inverters, Panelboards, 50 A, Class RK1, Non-indicating, 200 kAIC at 600 Vac, 100 kAIC at 600 Vdc, Standard
Product Name
Eaton Bussmann series KWS-R fuse
Catalog Number
KWS-R-50
UPC
051712591164
Product Length/Depth
5.5 in
Product Height
1.06 in
Product Width
1.06 in
Product Weight
0.33 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
50 A
Interrupt rating
200 kAIC at 600 Vac 100 kAIC at 600 Vdc
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-50
Bussmann series 250Vac/dc KWN-R and 600Vac/dc KWS-R Data Sheet No. 10413
Bussmann series 250Vac/dc KWN-R and 600Vac/dc KWS-R Data Sheet No. 10413
Datasheet - FNQ-30
Feature: 50 A amperage rating with 200 kAIC interrupt capacity at 600 Vac and 100 kAIC at 600 Vdc. Business Impact: Delivers high reliability for PV inverters and panelboards, reducing the risk of nuisance trips during surge events and limiting downtime in critical solar installations. Application: Ideal for photovoltaic systems, grid-tied inverters, and commercial panelboards, ensuring fast, dependable fault clearing. Feature: Class RK1 construction with non-indicating fuse indicator. Business Impact: Standardized fuse behavior supports predictable protection without visual indicators, lowering maintenance complexity and enabling straightforward field replacement. Application: Suitable for field replaceable protection in retrofit and new builds where quick swaps are essential. Feature: CE Marked compliance. Business Impact: Supports regulatory acceptance in EU markets, simplifying documentation and audit readiness for multi-site deployments. Application: Global deployments where CE compliance is a baseline requirement. Feature: Compact, standard-packaging form factor (5.5 in length, 1.06 in width, 1.06 in height). Business Impact: Easy integration into existing fuse blocks and panelboard layouts, reducing design changes and installation time. Application: Fits standard cabinets and terminal blocks used in PV and electrical protection schemes. Feature: DC and AC voltage ratings (600 Vac / 600 Vdc). Business Impact: Provides unified protection across mixed AC/DC circuits in PV strings and inverters, reducing part count and stocking costs. Application: PV arrays, inverters, and mixed-voltage panels where a single fuse type covers both domains. Feature: Availability of official documentation and datasheets. Business Impact: Accelerates design validation and compliance checks, supporting faster project approvals. Application: Design engineering, procurement, and field service teams seeking authoritative specifications.
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FAQs
For PV applications, plan for the fuse’s 5.5 in length and 1.06 in by 1.06 in footprint to fit standard fuse blocks. Use standard packaging for quick swaps and ensure mounting orientation is supported by your panelboard design. The non-indicating feature means relying on panel indicators or system status alarms rather than built-in visuals.
The KWS-R-50 is a 50 A fuse with an interrupt rating of 200 kAIC at 600 Vac and 100 kAIC at 600 Vdc. It is rated for 600 Vac and 600 Vdc, making it suitable for both AC and DC protection in PV systems and related power electronics.
Yes. With a 100 kAIC interrupt capability at 600 Vdc and a 50 A rating, the KWS-R-50 provides robust DC protection for PV strings while staying compatible with standard RK1 fuse blocks used in distributed solar installations.
Official resources include the Eaton specification sheet for KWS-R-50, Bussmann series catalogs, and a data sheet covering KWN-R and KWS-R devices. Additional material such as the Fuseology video is available to assist with application notes and installation guidance.
The KWS-R-50 offers reliable overcurrent protection with high interrupt ratings, reduces downtime risk, and supports CE-compliant designs. Its standard form factor and documented specifications simplify procurement, design validation, and field service, translating to shorter project timelines and lower maintenance costs.