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Five glass cylinder fuses with silver metal end caps

Bussmann

Bussmann S500-2.5-R Glass Fuse 2.5A 250V 35A 5 PK

SKU CH-2XSW-BXKWG

Pack of five fast-acting glass fuses rated 2.5 A at 250 V AC with a 35 A interrupt rating

  • Fast-acting protection for sensitive circuits with 2.5 A rating
  • High interrupt capacity of 35 A at 250 V AC handles fault currents safely
  • Compact 20 mm × 5 mm cylindrical glass body fits standard fuse blocks
  • UL Guide JDYX2, CE and CSA certified for verified compliance
  • Pack of five fuses provides ready spares for maintenance needs

What this fuse protects

The Bussmann S500-2.5-R is a 2.5 A fast-acting glass fuse rated for 250 V AC circuits. It interrupts fault currents up to 35 A at that voltage. The cylindrical 20 mm by 5 mm body fits standard HTB fuse blocks. Each pack contains five fuses for spares or multiple circuits.

Behaviour under sustained load

The single-element design opens quickly when current exceeds 2.50 A, limiting energy let-through during overloads. A 35 A interrupt rating at 250 V AC means the fuse can clear moderate short circuits without rupturing. Glass construction lets you verify the element visually after a fault. Continuous operation at rated current remains stable within the specified limits.

Installation and common issues

Insert the fuse into a compatible HTB series block; the non-rejection style requires no special keying. Confirm the 20 mm length and 5 mm diameter match the holder before fitting. A frequent mistake is using a slow-blow type where fast-acting protection is specified, which can allow downstream damage during a fault. Always replace with the same S500 or equivalent GDB, 217, GSB series ratings.

How it compares

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

Price $10.99
Cheaper than about 92% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameEATON BUSSMANN

Questions about this item

How much heat does the 2.5 A glass fuse generate when running continuously at its rated current?

The fuse is a passive component; it does not generate significant heat when operating below its 2.5 A rating and will interrupt at 35 A fault current.

What fuse holder or block series is required to install these 5 mm × 20 mm cylindrical fuses?

They are compatible with the HTB fuse block series and any holder accepting 5 mm diameter by 20 mm length glass fuses.

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

Yes, they are listed as equivalent to Bussmann GDB, S500, Littelfuse 217 and Mersen GSB series for direct replacement.

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