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Five cylindrical glass fuses with metal end caps

Bussmann

Bussmann S500-4-R 4A 250V 40A 5pk line protection

SKU CH-EQ5D-C6V8D

Pack of five 4 A glass tube fuses rated 250 V AC with a 40 A interrupt rating

  • Fast-acting protection for sensitive circuits with 40 A interrupt rating at 250 V AC
  • Compact 20 mm × 5 mm glass body fits standard fuse blocks and holders
  • UL JDYX2, CE and CSA certified for safety compliance across applications
  • Direct replacements for Bussmann GDB, Littelfuse 217 and Mersen GSB series fuses
  • Five-piece pack provides convenient spares for maintenance or multi-circuit installations

Bussmann S500 4A 250V Glass Fuse

This pack contains five EATON BUSSMANN S500-4-R fast-acting glass fuses rated at 4 A and 250 V AC. The cylindrical 20 mm x 5 mm bodies suit equipment using standard 5 x 20 mm fuse holders. A 40 A interrupt rating at 250 V AC provides reliable over-current protection for low-power circuits.

Suitable for low-current mains circuits

Maintenance technicians and hobbyists servicing instruments, chargers or small appliances that specify a 4 A fast-acting fuse will find this pack convenient. Installations requiring a time-delay characteristic, a higher voltage rating, a different diameter or a rejection-type fuse should look at alternative series.

40 A interrupt rating at 250 V AC

This single figure defines whether the fuse can safely clear a fault on the intended supply. If the prospective short-circuit current at the point of installation exceeds 40 A, the device is not rated for that location and a higher interrupting-capacity fuse must be selected.

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Price $9.99
Cheaper than about 93% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameEATON BUSSMANN

Questions about this item

How much heat does the 4 A 250 V AC fuse generate when running all day?

The fuse operates at its rated 4 A with minimal heat rise; the glass body and fast-acting element are designed to carry full load continuously without overheating the holder.

What fuse holder or block must I already own for these 20 mm x 5 mm glass fuses?

They fit standard 5 × 20 mm cylindrical fuse clips or blocks such as the compatible HTB series; no special rejection feature is required.

Will these S500-4-R fuses coordinate with older 217 or GDB series fuses already in my panel?

Yes — they are direct equivalents to Bussmann GDB, Littelfuse 217 and Mersen GSB, so they provide the same 40 A interrupt rating at 250 V AC in existing circuits.

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