Bussmann Eaton KWS-R LIMITRON ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$398.65
Bussmann Eaton KWS-R LIMITRON Class RK1 Non-Indicating Fuse

Bussmann Eaton KWS-R LIMITRON Class RK1 Non-Indicating Fuse

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Model: KWS-R-40

In Stock (leaves warehouse same day if ordered before 3pm ET)

$398.65
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Bussmann Eaton KWS-R LIMITRON Class RK1 Non-Indicating Fuse

The Bussmann Eaton series KWS-R LIMITRON fuse is a fast-acting, Class RK1, non-indicating fuse engineered for photovoltaic systems, inverters, and panelboards. This series is available in amp ratings from 40A to 60A, built in a blade end x blade end configuration for standard fuse holders and blocks. Rated 600 V (600 Vac/600 Vdc), the KWS-R delivers a 100 kAIC interrupt rating at 600 Vdc and 200 kAIC at 600 Vac, giving installers dependable overcurrent protection for demanding solar and industrial power circuits.

Key Features

  • Amp Rating Range: Offered in 40A and 60A ratings to match photovoltaic, inverter, and panelboard circuit requirements.
  • Fast-Acting LIMITRON Design: Class RK1 fast-acting fuse element engineered for reliable overcurrent protection in critical power circuits.
  • Non-Indicating Construction: Standard non-indicating body for straightforward field identification and replacement.
  • Blade End x Blade End: Standard blade-to-blade terminal configuration for compatibility with common RK1/RK5-rated fuse blocks and holders.
  • Voltage Rating: Rated 600 V, covering both 600 Vac and 600 Vdc circuits, suited to AC panelboards and DC photovoltaic strings alike.
  • High Interrupt Rating: 100 kAIC at 600 Vdc and 200 kAIC at 600 Vac for dependable withstand capability under high fault-current conditions.
  • Class RK1 Fuse: Rejection-style Class RK1 construction for use in RK1/RK5 fuse blocks and holders across photovoltaic and industrial systems.
  • Standard Fuse Series: Part of the Standard KWS-R LIMITRON offering from Eaton's Bussmann series for photovoltaic and power distribution applications.

Certifications & Compliance

  • CE Marked

Technical Specifications

  • Product Weight: .33 lb
  • Voltage Rating: 600 Vac, 600 Vdc
  • Compliances: CE Marked
  • Amp Rating Options: 40A, 60A
  • Interrupt Rating: 100 kAIC at 600 Vdc, 200 kAIC at 600 Vac
  • Terminal Configuration: Blade end x blade end
  • Fuse Class: RK1

Typical Applications

  • Photovoltaic (Solar) Power Systems
  • Solar Inverters
  • Panelboards and Power Distribution Equipment
  • Commercial and Industrial Overcurrent Protection
  • DC and AC Circuit Fusing for Renewable Energy Installations

Why Bussmann?

Bussmann by Eaton is a trusted name in circuit protection, and the KWS-R LIMITRON series brings Class RK1 fast-acting performance to demanding photovoltaic and power distribution applications. With a 600 V rating and interrupt capacity up to 200 kAIC at 600 Vac, this fuse series is built to deliver the dependable, code-compliant overcurrent protection professionals rely on for solar and industrial installations across the 40A to 60A range.

Manufacturer Resources

Product Specs

Connection:
Blade end x blade end
Packaging Type:
Standard
Department:
Electrical
Fuse Indicator:
Non-indicating
Class:
Class RK1
Product Weight:
.33 lb
Voltage Rating:
600V
Compliances:
CE Marked
Interrupt Rating:
100 kAIC at 600 Vdc
Product Type:
Fuse
Series:
KWS-R
Grade:
Class RK1
Amperage Rating:
40A-60A
Listing:
CE Marked
Product Group:
Fuses
Product Subgroup:
Other Fuses

Bussmann KWS-R-40 – Frequently Asked Questions

1) Will a Bussmann KWS-R fuse fit a Class R fuse block, and can I use it in place of a Class RK5 fuse?
The KWS-R is a rejection-style Class RK1 fuse with a blade end x blade end terminal configuration, so it drops into standard Class R (RK1/RK5) blocks and holders in the 40 to 60 amp range. You can put an RK1 in a block sized for RK5, since RK1 is the faster, lower let-through class and the rejection feature is common to both. Going the other direction is what you cannot do: a non-rejection Class H or K fuse will not seat in a Class R block.
2) Is the KWS-R a fast-acting fuse or a time-delay fuse, and does that matter for an inverter circuit?
Fast-acting. The KWS-R LIMITRON uses a Class RK1 fast-acting element, which clears quickly and holds let-through energy down for component protection on inverters, PV strings and panelboard feeders. It is not a dual-element time-delay fuse, so it is not the right choice ahead of a motor load with a heavy inrush, where a time-delay Class RK1 or RK5 should be used instead.
3) What amp ratings does the KWS-R LIMITRON fuse come in and what are the part numbers?
Two ratings: 40 amp as KWS-R-40 and 60 amp as KWS-R-60, both 600 V Class RK1. If your circuit calls for something below 40A or above 60A, this particular series will not cover it.
4) Does the KWS-R fuse have a blown-fuse indicator?
No. The KWS-R is a non-indicating fuse, so there is no pop-out pin or window to show it has opened. Crews troubleshooting a dead string will need a meter or a continuity check to identify the open fuse. If visual indication matters for your maintenance routine, specify an indicating Class R fuse instead.
5) Is the interrupt rating on the KWS-R high enough for a 600V panelboard with high available fault current?
It is rated 200 kAIC at 600 Vac and 100 kAIC at 600 Vdc. Available fault current at a commercial service rarely approaches those figures, so the fuse will not be the limiting element in most short-circuit current rating calculations at 600 V or below.
6) What compliance marking does the Bussmann KWS-R carry?
The KWS-R LIMITRON is CE Marked. That is the compliance marking on record for this series.
7) How is the KWS-R fuse packaged and how much does one weigh?
Standard packaging, with each fuse at .33 lb. Useful if you are stocking spares on a service truck or costing freight on a bulk order for a facility spares crib.
How fast can I get the Bussmann KWS-R-40 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Bussmann KWS-R-40 come with a warranty?
Absolutely. The Bussmann KWS-R-40 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Bussmann KWS-R-40?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Bussmann KWS-R-40 from ZenSupply?
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