Eaton KWS-R-40 Fuse - Class RK1 40A, 600 Vac/Vdc
Part Number: KWS-R-40
Quick Summary
Eaton KWS-R-40 fuse protects PV inverters and panelboards by delivering fast-acting overcurrent protection for solar power systems. In practice, engineers struggle to source fuses that meet high DC interrupt ratings while fitting blade-end configurations in compact enclosures. This device is CE marked and aligns with Class RK1 protection standards, offering reliable performance for both DC 600 V and AC 600 Vac environments. By combining a 40 A rating with a 100 kAIC DC interrupt rating and 200 kAIC AC capability, it helps maximize uptime, safety, and system margin. This fuse is ideal for photovoltaic installations and industrial switchgear, delivering robust protection with straightforward integration into Bussmann series components.
Product Information
Extended Description
KWS-R-40 Eaton: Eaton Bussmann series KWS-R fuse, Photovoltaic systems, Inverters, Panelboards, 40 A, Class RK1, Non-indicating, Blade end x blade end, 100 kAIC at 600 Vdc, 200 kAIC at 600 Vac, Standard
Product Name
Eaton Bussmann series KWS-R fuse
Catalog Number
KWS-R-40
UPC
051712658829
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
40 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
Connection
Blade end x blade end
Fuse indicator
Non-indicating
Bussmann series complete full line catalog no. 1007
Bussmann series Fuseology
Eaton Specification Sheet - KWS-R-40
KWS-R-40~LIMITRON FAST ACTING FUSE
KWS-R-40~LIMITRON FAST ACTING FUSE
Datasheet - FNQ-30
Feature: 40 A current rating with 100 kAIC at 600 Vdc and 200 kAIC at 600 Vac. Business Impact: Enables rapid fault clearance in both DC and AC domains, reducing downstream damage and downtime. Application: PV inverters, panelboards, and solar feeders in industrial environments benefit from reliable high-energy interruption capabilities. Feature: Blade end x blade end terminals for quick, secure connections. Business Impact: Simplifies installation, minimizes wiring errors, and shortens commissioning time. Application: Suitable for standard blade-style fuse blocks and panel assemblies in solar and industrial racks. Feature: Class RK1 fuse with non-indicating operation. Business Impact: Clear protection classification supports precise coordination with upstream protection schemes while reducing routine maintenance checks. Application: Switchgear, junction boxes, and control panels in demanding electrical environments. Feature: Compact 5.5 in length and 1.06 in square footprint. Business Impact: Fits dense enclosures and compact distribution layouts, enabling higher circuit density without packaging tradeoffs. Application: Space-constrained photovoltaic arrays and commercial/industrial distribution boxes. Feature: CE Marked compliance and Bussmann LIMITRON fast-acting family. Business Impact: Meets international safety standards and delivers fast clearing to minimize arc exposure, contributing to safer operations and lower risk of collateral fault damage. Application: Global solar installations and mixed-gear protection schemes. Feature: Non-indicating design. Business Impact: Reduces maintenance overhead by eliminating optional indicator components, lowering lifecycle costs. Application: Continuous monitoring environments where visual indication is not required.
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FAQs
The KWS-R-40 uses blade-end x blade-end terminals designed for quick, secure insertion into standard Bussmann fuse blocks and panelboards. Ensure alignment with the device’s Class RK1 protection scheme and verify the enclosure supports a 5.5 inch length. Use appropriate Bussmann series components for a complete protection path, and follow PPE and lockout/tagout procedures during installation.
Key ratings are 40 A nominal current, 100 kAIC interrupt rating at 600 Vdc, and 200 kAIC at 600 Vac. For DC photovoltaic circuits, design protection to handle up to 100 kAIC without exceeding device capabilities, and coordinate with upstream protection to prevent nuisance trips. For AC loads, the 200 kAIC rating supports high fault currents typical in AC distribution networks.
Yes. The KWS-R-40 is specifically marketed for PV systems, inverters, and panelboards, with high DC and AC interrupt ratings and a compact blade-end package. It is CE marked for regulatory compatibility, and its RK1 classification helps align with common solar and industrial protection schemes, making it suitable for space-constrained outdoor and indoor installations.
The fuse is CE marked, indicating compliance with European safety and EMC requirements. It belongs to the LIMITRON family, offering proven fast-acting protection. While UL/其他 certifications are not listed in this data, CE marking supports broad European and many global installations, and Class RK1 designation aids in standard protection coordination across panels and switchgear.
The KWS-R-40 delivers rapid fault clearance with high interrupt ratings, reducing downstream damage and downtime in PV systems. Its non-indicating design lowers maintenance needs, while blade-end connections streamline installation. Overall, it can lower field labor costs, shorten mean time to repair, and improve system availability in solar and industrial power architectures.