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Glass tube fuse, cylindrical, 20 mm length, 5 mm diameter, metal end caps

Bussmann

Bussmann GMD-1.25-R Glass Fuse 1.25A 250V AC line protection

SKU CH-W64X-3P26K

A 1.25 A, 250 V AC time-delay glass fuse in a 20 mm × 5 mm cylindrical body with 100 A interrupt rating at 250 V and 10 kA at 125 V

  • Time-delay operation handles temporary surges without nuisance blowing
  • 100 A interrupt rating at 250 V AC clears faults safely
  • 10 kA interrupt rating at 125 V AC for higher-energy circuits
  • 20 mm × 5 mm cylindrical glass body fits standard fuse holders
  • UL 248-14, CSA 1422-01 and CE marks confirm compliance

What this fuse protects

The Bussmann GMD-1.25-R is a glass time-delay fuse rated at 1.25 A and 250 V AC. It suits low-current line protection in equipment such as generators, control panels or industrial power supplies. The cylindrical 20 mm x 5 mm body fits standard HTB fuse blocks and is sold in packs of five.

The rating that decides fit

The interrupt rating is 100 A at 250 V AC and 10 kA at 125 V AC, so the fuse can safely clear faults on circuits that do not exceed those levels. It carries CE marking, CSA Class 1422-01 certification and UL 248-14 Guide JDYX approval. If your circuit demands a higher interrupt capacity or a different voltage rating, this part will not meet code.

Installing and common mistakes

The fuse simply presses into a compatible HTB block; no tools are required. Because it is a non-rejection type, it will fit blocks that accept other 20 mm x 5 mm fuses, so verify the series marking before insertion. A frequent error is using a fast-acting fuse where the time-delay characteristic is needed, causing nuisance trips on inrush current.

How it compares

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

Price $13.99
Cheaper than about 88% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameEATON BUSSMANN

Questions about this item

What does the 100 A interrupt rating at 250 V AC tell me about how this fuse behaves in a real circuit?

It means the fuse can safely interrupt a fault current of up to 100 A at 250 V AC without rupturing.

How does the 10 kA rating at 125 V AC limit what this fuse can protect?

At 125 V AC the fuse is rated to interrupt fault currents up to 10 kA, so it is suitable for higher-energy circuits at that voltage.

Will this 20 mm by 5 mm cylindrical glass fuse fit my existing holder?

The fuse body is 20 mm long and 5 mm in diameter, matching the standard 5×20 mm cartridge size used in many HTB-series fuse blocks.

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