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Five ceramic cylinder fuses with silver end caps

Bussmann

Bussmann MDA-4-R Ceramic Fuse 4A 250V 5 Pack

SKU CH-N3RJ-248E5

Ceramic time-delay fuse rated 4 A, 250 V AC with 10 kA interrupt at 125 V and 200 A at 250 V, supplied in a pack of five

  • Ceramic body suits high-temperature environments
  • Time-delay characteristic prevents nuisance trips from surges
  • 10 kA interrupt rating at 125 V AC handles strong fault currents
  • 200 A interrupt rating at 250 V AC for higher-voltage circuits
  • Direct replacements for Littelfuse 326 and Mersen GSA series

Ceramic Fuse for Circuit Protection

The Bussmann MDA-4-R is a cylindrical ceramic fuse rated at 4 amps and 250 volts AC. It is designed for non-indicating, time-delay protection in electrical circuits and generator supply lines. The fuse body measures 1-1/4 inches long by 1/4 inch in diameter. It suits technicians and installers who need a non-rejection style fuse for compatible fuse blocks.

Interrupt Ratings and Thermal Behaviour

The fuse carries an interrupt rating of 10kA at 125V AC and 200A at 250V AC. Its ceramic body provides stable insulation during normal operation and fault conditions. The time-delay characteristic allows temporary inrush currents to pass without nuisance opening. No active cooling or noise is involved in its passive operation.

Sustained Overload Response

Under sustained overcurrent, the single-element design melts to interrupt the circuit after the time-delay window expires. This prevents damage to downstream equipment during prolonged fault conditions. The fuse is not suited for applications requiring visual indication or rejection-type keying. It replaces equivalents such as Littelfuse 326 and Mersen GSA series fuses.

Highlights

  • Ceramic body suits high-temperature environments
  • Time-delay characteristic prevents nuisance trips from surges
  • 10 kA interrupt rating at 125 V AC handles strong fault currents
  • 200 A interrupt rating at 250 V AC for higher-voltage circuits
  • Direct replacements for Littelfuse 326 and Mersen GSA series

Specifications

BrandEATON BUSSMANN

Questions about this item

How do I install the MDA-4-R fuse and what is the common mistake to avoid?

Insert the cylindrical ceramic body into a compatible fuse block such as the 3823, HFA, HHN, HK, HKP, HPF, HRK, HTB or S-8000 series, ensuring the 1-1/4 in length and 1/4 in diameter match the clips; the frequent error is using a rejection-type holder that will not accept this non-rejection fuse.

What maintenance or replacement will the MDA-4-R fuse need later?

The fuse is a single-element, non-indicating, time-delay device with no serviceable parts; once it interrupts a fault at 10kA at 125V AC or 200A at 250V AC it must be replaced with another MDA-4-R or equivalent 326, GSA or MDA series fuse.

What limit appears first during sustained operation of the MDA-4-R fuse?

The fuse is rated for continuous carry at 4 A and 250 V AC; exceeding this current causes the time-delay element to open, which is the first limit reached under prolonged load.

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