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Five cylindrical glass tube fuses with silver metal end caps on a white background

Bussmann

Bussmann GMD-4-R Glass Fuse 4A 250V Time-Delay 5 Pack

SKU CH-KK5Q-47TBA

Pack of five 4 A, 250 V time-delay glass fuses with 10 kA interrupt rating at 125 V AC

  • Time-delay protection prevents nuisance blows from inrush currents
  • 4 A rating at 250 V AC suits standard circuits
  • Glass body allows visual inspection of element status
  • 10 kA interrupt rating at 125 V AC handles high fault currents
  • Pack of five provides ready spares for maintenance

GMD-4-R Glass Fuse 4A 250V

These time-delay glass fuses protect circuits rated at 4 amperes and 250 volts AC. The pack contains five cylindrical units suited for equipment that experiences brief inrush currents during start-up.

Capacity and headroom

Each fuse carries 4 A continuously and withstands short surges thanks to its time-delay element. The interrupt rating is 10 kA at 125 V AC and 200 A at 250 V AC, so fault currents above those levels require upstream protection.

5 mm × 20 mm cylindrical standard

The 5 mm diameter by 20 mm length body fits HTB-series fuse blocks and matches the Bussmann GMD, Littelfuse 239 and Mersen GSC series. Glass construction allows visual inspection but offers no rejection feature to prevent incorrect rating insertion.

Highlights

  • Time-delay protection prevents nuisance blows from inrush currents
  • 4 A rating at 250 V AC suits standard circuits
  • Glass body allows visual inspection of element status
  • 10 kA interrupt rating at 125 V AC handles high fault currents
  • Pack of five provides ready spares for maintenance

Specifications

BrandEATON BUSSMANN

Questions about this item

Will the 20 mm × 5 mm GMD-4-R glass fuse fit the same fuse block as my existing 5 × 20 mm Littelfuse 239?

Yes — the GMD-4-R is listed as equivalent to the Littelfuse 239 series and shares the 20 mm length and 5 mm diameter, so it fits the same cylindrical fuse holders.

How can I verify the fuse is operating correctly after installation?

The fuse is a single-element, time-delay type rated 4 A at 250 V AC; normal operation shows continuity across the glass body, and it will open only when current exceeds 4 A for the time-delay period.

What comes in the pack and do I need a separate fuse holder?

The package contains five GMD-4-R glass fuses; a compatible fuse block such as the HTB series is not included and must be purchased separately if you do not already have one.

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