Bussmann FCF CUBEFuse Class CF...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$132.90
Bussmann FCF CUBEFuse Class CF Fuse, 600V Non-indicating

Bussmann FCF CUBEFuse Class CF Fuse, 600V Non-indicating

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Model: FCF20RN

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

$132.90
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Bussmann FCF CUBEFuse Class CF Fuse, 600V Non-indicating

The Bussmann FCF CUBEFuse is a Class CF, 600 Vac/600 Vdc fuse built for Critical/UPS power protection, available across amp ratings from 10A through 90A (10A, 15A, 20A, 30A, 35A, 40A, 45A, 70A, 80A, 90A). Each fuse features a single-element (1), Black, non-indicating body with a blade-end terminal, and is rated for both 50 Hz and 60 Hz service. Interrupt ratings of 300 kAIC at 600V and 50 kAIC at 600 Vdc deliver dependable overcurrent protection for demanding commercial and industrial panels.

Key Features

  • Amp Rating Range: Available in 10A, 15A, 20A, 30A, 35A, 40A, 45A, 70A, 80A, and 90A ratings to cover a wide range of Critical/UPS circuit-protection needs.
  • Class CF CUBEFuse Design: Compact, blade-end terminal construction supports high-density panel mounting.
  • Durable Construction: Electroless tin-plated copper alloy terminal and glass-filled PES body provide reliable conductivity and mechanical strength.
  • Electrical Rating: Rated 600 Vac / 600 Vdc with interrupt ratings of 300 kAIC at 600V and 50 kAIC at 600 Vdc.
  • Fast-Acting Time-Current Response: Opens in 4 minutes at 200% of rated current for dependable overcurrent clearing.
  • Low Power Loss: Only 3.48 W power loss per fuse, reducing heat buildup inside the enclosure.
  • Frequency Rating: Suitable for 50 Hz and 60 Hz applications.
  • Non-Indicating, Black Housing: Single-element (1) construction rated for -40° to 80°C operating temperature.

Certifications & Compliance

  • UL Listed
  • CE Marked

Technical Specifications

  • Class: Class CF
  • Packaging Type: Standard
  • Number Of Elements: 1
  • Operating Temperature: -40° to 80°C
  • Compliances: CE Marked
  • Certifications: UL Listed
  • Fuse Indicator: Non-indicating
  • Voltage Rating: 600 Vac, 600 Vdc

Typical Applications

  • Critical Power and UPS Systems
  • Panelboard and Load Center Circuit Protection
  • Commercial and Industrial Electrical Distribution
  • Data Center and Mission-Critical Power Protection
  • Renovation and New Construction Panel Upgrades

Why Bussmann?

Bussmann by Eaton engineers the FCF CUBEFuse with a glass-filled PES body and electroless tin-plated copper alloy terminal for consistent conductivity and mechanical durability. Backed by UL Listed and CE Marked compliance across its full 10A-90A Class CF range, this fuse delivers code-compliant, reliable overcurrent protection for Critical/UPS and industrial power distribution.

Manufacturer Resources

Product Specs

Class:
Class CF
Terminal Material:
Electroless tin plated copper alloy terminal
Frequency Rating Min:
50 Hz
Packaging Type:
Standard
Connection:
Blade end
Number Of Elements:
1
Product Color:
Black
Operating Temperature:
-40° to 80°C
Compliances:
CE Marked
Department:
Electrical
Certifications:
UL Listed
Frequency Rating Max:
60 Hz
Fuse Indicator:
Non-indicating
Product Material:
Glass Filled PES
Voltage Rating:
600V
Product Type:
Fuse
Product Finish:
Electroless Tin-Plated
Configuration:
Blade End Terminal
Listing:
UL Listed
Standards:
CE Marked
Product Group:
Fuses
Product Subgroup:
Other Fuses

Bussmann FCF20RN – Frequently Asked Questions

1) What amp ratings does the Bussmann FCF CUBEFuse come in, and what part number do I order?
Ten ratings, all 600V: 10A (FCF10RN), 15A (FCF15RN), 20A (FCF20RN), 30A (FCF30RN), 35A (FCF35RN), 40A (FCF40RN), 45A (FCF45RN), 70A (FCF70RN), 80A (FCF80RN) and 90A (FCF90RN). There is no 25A, 50A, 60A or 100A in this non-indicating group, so if your one-line calls for one of those, the FCF range will not cover it.
2) Can I use the FCF CUBEFuse on a 480V or 600V DC circuit?
Both are covered. The CUBEFuse carries a 600 Vac and 600 Vdc rating, so it works on any AC system at or below 600V, including 480Y/277 and 600V three-phase, as well as DC bus work up to 600 Vdc. The interrupting rating differs between them: 300 kAIC on AC at 600V and 50 kAIC at 600 Vdc. On a high available-fault service, size your short-circuit study against the AC figure; on a battery or UPS DC bus, use the 50 kAIC number.
3) Will this fuse tell me when it has blown, or do I have to test it?
The FCF is the non-indicating version, black body, so there is no pop-up or visual blown indicator on the fuse itself. You confirm it with a meter or by the open-fuse trip indication on the disconnect. If a maintenance crew needs to spot a cleared fuse at a glance in a panel lineup, specify an indicating CUBEFuse instead of the FCF.
4) Is the Bussmann CUBEFuse a good choice for a UPS or data center distribution panel?
That is what the FCF is built around. It is aimed at critical and UPS power protection, with a 600 Vac/600 Vdc rating that covers both the AC feed and the DC battery side, and 300 kAIC interrupting at 600V for the high available fault current you see close to a large service. Power loss is 3.48 W per fuse, which keeps heat down in a packed enclosure, and the Class CF blade-end body is compact enough for high-density mounting where a Class J block would eat the space.
5) How fast does the FCF CUBEFuse clear an overload, and will it hold a motor inrush?
Published time-current behavior is opening in 4 minutes at 200 percent of rated current, a fast-acting single-element characteristic. Single-element fuses do not carry the intentional time delay that a dual-element fuse uses to ride through motor starting inrush, so for a motor branch circuit with a long accelerating load, a time-delay fuse is the better match. The FCF suits feeder, panelboard and UPS circuit protection where the load is not a hard-starting motor.
6) Can the CUBEFuse go in an unheated outdoor or rooftop enclosure?
Operating temperature runs -40 to 80 degrees C, so unheated mechanical rooms, rooftop gear and cold-climate outdoor enclosures are inside the fuse's range. The body is glass-filled PES with an electroless tin-plated copper alloy terminal, which is what holds up mechanically and conductively across that swing. The enclosure itself still has to carry the outdoor rating, the fuse does not provide it.
7) Is the Bussmann FCF fuse UL Listed for a hospital or school panel inspection?
The FCF CUBEFuse is UL Listed and CE Marked, which is the documentation an inspector or a facility spec typically asks for on an overcurrent device. Those two are the certifications carried on the fuse; standardize on a single amp rating family across a facility and the submittal work is the same sheet each time.
8) Do I need any extra hardware or a fuse block when I order a CUBEFuse?
The FCF ships as the fuse alone, standard packaging, with a blade-end terminal. It needs a Class CF fuse holder or a CUBEFuse-equipped disconnect or switch to land in, and that holder is a separate order if the panel does not already have one. Replacing a blown CUBEFuse in existing gear needs nothing but the fuse.
9) Does the FCF CUBEFuse work on 50 Hz power for export or imported equipment?
Yes, the fuse is rated for both 50 Hz and 60 Hz service, so a machine built for a 50 Hz supply and a standard North American 60 Hz panel both take the same part. The CE Mark covers the European side of the paperwork.
How fast can I get the Bussmann FCF20RN 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 FCF20RN come with a warranty?
Absolutely. The Bussmann FCF20RN 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 FCF20RN?
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
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