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Five cylindrical ceramic fuses with silver end caps

Bussmann

Bussmann MDA-8-R Ceramic Fuse 8A 250V 5 PK line protection

SKU CH-QQFA-41BPY

Ceramic time-delay fuse rated 8 A at 250 V AC with a 10 kA interrupt rating at 125 V AC and 200 A at 250 V AC, supplied in a pack of five

  • Time-delay operation protects circuits from brief surges
  • Ceramic body withstands high interrupt energy
  • 10 kA interrupt rating at 125 V AC
  • 200 A interrupt rating at 250 V AC
  • Pack of five gives ready spares

Circuit protection for low-voltage circuits

The Bussmann MDA-8-R ceramic fuse provides 8 A time-delay protection at 250 V AC for control panels, lighting ballasts and small motor circuits. The cylindrical 1-1/4 in by 1/4 in body fits standard holders used in industrial and commercial equipment. Each pack contains five non-indicating fuses for quick replacement during scheduled maintenance or fault finding.

Thermal behaviour and power dissipation

Ceramic construction withstands the heat generated during normal 8 A operation without deforming the body or degrading the element. The time-delay characteristic absorbs brief inrush currents from transformers or capacitor banks while keeping voltage drop low across the fuse. Interrupt ratings of 10 kA at 125 V AC and 200 A at 250 V AC ensure safe clearance of typical faults without excessive energy let-through.

Sustained overload response

Under continuous overload the single-element design melts predictably to isolate the circuit before wiring insulation is damaged. The non-rejection style allows direct fit in compatible 3823, HFA, HHN, HK, HKP, HPF, HRK, HTB and S-8000 fuse blocks without adapter hardware. Buyers needing visual blown indication or faster acting characteristics should select alternative series.

Highlights

  • Time-delay operation protects circuits from brief surges
  • Ceramic body withstands high interrupt energy
  • 10 kA interrupt rating at 125 V AC
  • 200 A interrupt rating at 250 V AC
  • Pack of five gives ready spares

Specifications

BrandEATON BUSSMANN

Questions about this item

How do I install the MDA-8-R fuse in a compatible fuse block, and what is the common mistake?

Insert the cylindrical 1-1/4 in by 1/4 in fuse into a 3823, HFA, HHN, HK, HKP, HPF, HRK, HTB or S-8000 series block; the error is using a rejection-type holder that will not accept this non-rejection body.

What maintenance or replacement will the MDA-8-R fuse need later?

The fuse is a single-element, non-indicating time-delay device; it cannot be reset, so after any overcurrent event that opens the element the entire fuse must be replaced with another 8 A, 250 V AC ceramic unit.

What limit appears first when the MDA-8-R fuse runs under sustained load?

The 8 A continuous current rating is the first limit; exceeding it causes the time-delay element to melt, while the interrupting capacity of 10 kA at 125 V AC or 200 A at 250 V AC only matters during a fault.

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