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Ceramic cylinder fuse, beige body with metal end caps

Bussmann

Bussmann ABC-20-R Ceramic Fuse 20A 250V AC 125V DC

SKU CH-D7K4-A1GC9

A 20 A fast-acting ceramic fuse rated 250 V AC and 125 V DC with 10 kA DC interrupt capacity

  • Fast-acting protection clears faults quickly
  • 20 A rating suits 250 V AC and 125 V DC circuits
  • High 10 kA interrupt capacity at 125 V DC
  • Ceramic body withstands thermal stress
  • Fits standard 1-1/4 in × 1/4 in fuse blocks

What This Fuse Is And Who Uses It

The Bussmann ABC-20-R is a fast-acting ceramic fuse rated 20 A at 250 V AC and 125 V DC. It carries interrupt ratings of 10 kA at 125 V DC, 1 kA at 125 V AC and 400 A at 250 V AC. The cylindrical body measures 1-1/4 in long by 1/4 in diameter and fits compatible fuse blocks such as the 3823, HFA, HHN, HK, HKP, HPF, HRK, HTB and S-8000 series.

Who Should Choose It And Who Should Not

This fuse suits circuits that need fast-acting overcurrent protection at the stated AC and DC voltages. It is not for applications requiring a rejection-style fuse, an indicating element, a higher interrupt rating than those listed, or a different body size or voltage rating.

The Specification That Decides Fit

The interrupt rating of 10 kA at 125 V DC, 1 kA at 125 V AC and 400 A at 250 V AC is the single figure that determines whether this fuse can safely clear a fault in your circuit.

Highlights

  • Fast-acting protection clears faults quickly
  • 20 A rating suits 250 V AC and 125 V DC circuits
  • High 10 kA interrupt capacity at 125 V DC
  • Ceramic body withstands thermal stress
  • Fits standard 1-1/4 in × 1/4 in fuse blocks

Specifications

BrandEATON BUSSMANN

Questions about this item

How do I install this cylindrical ceramic fuse and what step do people often miss?

Insert the 1-1/4 in by 1/4 in fuse into a compatible 3823, HFA, HHN, HK, HKP, HPF, HRK, HTB or S-8000 fuse block. The step often missed is verifying the block matches the non-rejection ABC series so the fuse seats fully.

What maintenance or replacement will this non-indicating 20 A fuse need later?

Because it has no visual indicator, you must test continuity with a multimeter after any suspected over-current event. Replace the fuse if the element is open; there is no scheduled maintenance interval.

What limit appears first during sustained overload on this 250 V AC, 125 V DC fuse?

The 400 A interrupt rating at 250 V AC is the lowest breaking capacity, so a sustained fault near that level will reach the fuse's safe-interruption limit before the 1 kA at 125 V AC or 10 kA at 125 V DC ratings.

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