Finger-Safe Fast-Acting
CUBEFuse®
Delivers Superior
Protection with up to a 75%
Smaller Footprint
• Fast-acting protection specifically for UPS and other critical applications
• Finger-safe fuses minimize exposure to live parts, reducing hazard to personnel
• Integral use with Compact Circuit Protector (CCP) or CUBEFuse holder minimizes panel space
• Minimizes incident energy and reduces arc-flash hazards utilizing Class J electrical characteristics
• Available in Cooper Bussmann Quik-Spec Coordination Panelboard for easy installation in the smallest fusible panel footprint
Catalog Symbol: FCF_RN
Fast-Acting Fuse:
4 minutes maximum clearing time at 200% rated current for 1 to 30A fuse
4 minutes maximum clearing time at 200% rated current for 1 to 30A fuse
6 minutes maximum clearing time at 200% rated current for 35 to 60A fuse
8 minutes maximum clearing time at 200% rated current for 70 to 100A fuse
Amp Ratings: 1 to 100A
Voltage Ratings: 600Vac/dc
Interrupting Ratings: 1-60A
300kA RMS Sym. (UL)
200kA RMS Sym. (CSA)
50kA DC (UL & CSA)
Interrupting Ratings: 70-100A
200kA RMS Sym. (UL)
200kA RMS Sym. (CSA)
50kA DC (UL & CSA)
Agency Information:
• UL Listed Fuse: Guide JFHR, File E4273
• CSA Certified Fuse: Class 1422- 02, File 53787
• CE compliance for the European Union low voltage directive
• RoHS compliant
Other Ratings/Specifications:
Watts Loss at rated current:
FCF15RN: 3.48W
FCF15RN: 3.48W
FCF30RN: 5.45W
FCF60RN: 7.27W
FCF100RN: 11.50W
Operating and Storage Temperature Range: -40 to 80°C
Material Specifications:
• Case: Glass filled PES (Polyethersulfone)
• Terminals: Copper alloy
• Terminal plating: Electroless tin
Features and Product Benefits
• The world’s first finger-safe power fuse system.
• Smallest footprint of any class fuse including Class J, CC, T and RK.
• Class CF meets Class J fast-acting electrical performance requirements.
• Faster response to damaging faults to help reduce destructive thermal and magnetic forces.
• True fast-acting fuse construction.
• High interrupting rating to safely interrupt faults up to 300kA.
• No venting of arc or molten metal and gases during opening.
• Low let-through currents under fault conditions.
Catalog Numbers (amp rating)
Carton Quantity and Weight
FCF_RN Dimensions – in (mm)

Time-Current Characteristic Curves–Average Melt

Current Limitation Curves

Non-Indicating CUBEFuse® | |||||
FCF1RN | FCF3RN | FCF6RN | FCF10RN | FCF15RN | FCF20RN |
FCF25RN | FCF30RN | FCF35RN | FCF40RN | FCF45RN | FCF50RN |
FCF60RN | FCF70RN | FCF80RN | FCF90RN | FCF100RN |
Carton Quantity and Weight
Amp Rating | Carton Qty. | Weight Per Carton | |
lbs | kg | ||
FCF-1-30 | 12 | 1.39 | 0.63 |
FCF-35-60A | 12 | 1.42 | 0.65 |
FCF-70-100A | 6 | 1.74 | 0.79 |
FCF_RN Dimensions – in (mm)

Time-Current Characteristic Curves–Average Melt

Current Limitation Curves

CUBEFuse Holders, Disconnects and Panelboards
The CUBEfuse is used in the following Cooper Bussmann products.


All 100, 60 and 30A CUBEFuse holders can be dovetail together for the required number of poles with the smallest Class J fuse footprint possible.

The DIN rail mounted 1-, 2-, and 3-pole CCP_CF comes in 30, 60 and 100A versions. The CCP_CF is a compact, horsepower rated disconnect that offers 3X the protection in 1/3 the space of traditional circuit breaker solutions. Local, neon open fuse indication is standard (same as the CCPB in the Quik-Spec™ Coordination Panelboard). 2- and 3-pole versions are ganged and all versions offer a lockout/tagout provision for added safety.


1-, 2-, and 3-pole CCPB is an an ampacity-rejecting branch disconnect for the Quik-Spec™ Coordination Panelboard that uses the CUBEFuse up to 100A.
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