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Five cylindrical glass fuses with metal end caps in a row

Bussmann

Bussmann GMD-630-R Glass Fuse 630mA 250V AC 10kA 125V AC 20mm 5mm Pack 5

SKU CH-6AS3-V44Q9

Pack of five 20 mm glass time-delay fuses rated 630 mA at 250 V AC with 10 kA interrupt at 125 V AC

  • Time-delay protection handles brief surges without nuisance blowing
  • 630 mA rating at 250 V AC suits low-current circuits
  • High 10 kA interrupt rating at 125 V AC clears faults safely
  • Compact 20 mm × 5 mm glass body fits standard fuse holders
  • Pack of 5 provides ready spares for maintenance

Glass Fuse for Low-Current Protection

This pack contains five cylindrical glass fuses rated at 630 mA and 250 V AC. They are designed for circuit protection in equipment where a time-delay characteristic prevents nuisance opening during brief inrush currents. The non-rejection body style fits standard holders without a keyed notch.

Breaking Capacity Defines Safe Application

The interrupt rating is 100 A at 250 V AC and 10 kA at 125 V AC. This specification determines whether the fuse can safely clear a fault in your specific circuit without rupturing. Verify that the prospective short-circuit current of your application does not exceed these limits.

Fits HTB Series Blocks and Equivalent Series

Each fuse measures 20 mm long by 5 mm diameter and matches the Bussmann GMD, Littelfuse 239 and Mersen GSC series. They install directly into compatible HTB fuse blocks or other holders accepting this 5 x 20 mm form factor. The single-element construction simplifies replacement without additional components.

How it compares

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

Price $18.99
Cheaper than about 80% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameEATON BUSSMANN

Questions about this item

What does the 630 mA rating mean when the fuse is installed in a circuit?

The fuse will carry up to 630 mA continuously; if current exceeds that value it will open after a time delay, protecting downstream components.

What does the 10 kA interrupt rating at 125 V AC limit in practice?

It means the fuse can safely break a short-circuit current of up to 10 000 A at 125 V AC without rupturing the glass body.

What physical dimensions must a fuse holder or block accommodate for this fuse?

The fuse is a 20 mm long by 5 mm diameter cylindrical glass body, so the holder must accept that exact length and diameter.

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