We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
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.

How it compares

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

Price $14.99
Cheaper than about 87% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameEATON 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.

More in Breakers & Circuit Protection

Similar items