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Five cylindrical glass fuses with metal end caps

Bussmann

Bussmann GMA-63-R Glass Fuse 63mA 250V 5 Pack

SKU CH-D50C-BQGQQ

Pack of five 63 mA fast-acting glass fuses rated 250 V AC with 35 A interrupt capacity

  • Fast-acting protection clears faults quickly
  • 10 kA interrupt rating at 125 V AC handles high fault currents
  • 35 A interrupt rating at 250 V AC suits mains-voltage circuits
  • Glass cylindrical body 20 mm × 5 mm fits standard fuse holders
  • CE, CSA and UL certified for safety compliance

Fast-acting glass fuse 63 mA 250 V

The Bussmann GMA-63-R is a cylindrical glass fuse rated at 63 mA and 250 V AC. It belongs to the GMA series and uses a single-element, fast-acting design. Each pack contains five fuses measuring 20 mm in length and 5 mm in diameter. They suit low-current circuit protection in equipment that accepts 5 x 20 mm fuse holders.

Interrupt ratings and thermal behaviour

The fuse carries a 10 kA interrupt rating at 125 V AC and 35 A at 250 V AC. Its fast-acting element opens quickly under overload, limiting heat rise in the protected circuit. Glass construction allows visual inspection of the element after a fault. The non-rejection body fits standard clips without a keyed holder.

Integration with fuse blocks and standards

Compatible with HTB series fuse blocks, the fuse drops into existing 5 mm clips without modification. Certifications include CE, CSA Class 1422-01, UL Guide JDYX and PSE approval. Equivalent series from Littelfuse and Mersen are 235 and GGM respectively. Buyers needing higher current ratings or a different voltage class should select another part.

How it compares

Measured against everything we stock in Breakers & Circuit Protection, at today’s prices. Recalculated every night.

Price $10.99
Cheaper than about 92% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameEATON BUSSMANN

Questions about this item

How do I install the 20 mm by 5 mm glass fuse into a compatible HTB fuse block?

Insert the cylindrical fuse body fully into the HTB fuse block clips until it seats firmly; the step often missed is verifying both metal end caps make solid contact with the clip jaws.

What maintenance or replacement will the fast-acting 63 mA fuse need after it blows?

The fuse is single-element and non-rejection; once it interrupts a fault it must be replaced with an identical GMA-series 63 mA 250 V AC glass fuse — no resetting or partial servicing is possible.

At what current level does the 35 A interrupt rating at 250 V AC become the limiting factor during sustained overload?

The fuse will open quickly at currents above 63 mA; the 35 A rating only defines the maximum fault current it can safely interrupt at 250 V AC, not a sustained operating limit.

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