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Five cylindrical ceramic fuses with metal end caps

Bussmann

Bussmann S505-1.25-R Ceramic Fuse 1.25A 250V 1.5kA 5 PK line protection

SKU CH-S8EA-QZ4G4

Five 1.25 A time-delay ceramic fuses rated 250 V AC with a 1.5 kA interrupt rating

  • Time-delay characteristic absorbs temporary surges without nuisance blowing
  • 5 kA interrupt rating at 250 V AC breaks fault current safely
  • Ceramic body withstands high temperatures during overloads
  • Five fuses per pack supplies ready spares for maintenance
  • BSI, CCC, CSA, IMQ, SEMKO, UL, VDE certifications confirm broad compliance

Circuit protection for low-current mains

This pack contains five 20 mm by 5 mm ceramic cartridge fuses rated at 1.25 A and 250 V AC. The time-delay characteristic tolerates brief inrush currents while still interrupting faults up to 1.5 kA. They suit control panels, instrumentation and small appliances that specify the S505 or 215 series.

Buyers needing exact series interchangeability

Engineers specifying Bussmann S505, Littelfuse 215 or Mersen GSF parts can use these directly in compatible HTB fuse blocks. The non-rejection cylindrical body fits standard clips without a keyed holder. Installers who require visual indication, a higher interrupt rating or a different form factor should select another series.

1.25 ampere rating at 250 volts AC

This single value defines whether the fuse will carry the normal load and clear a fault safely. Verify the equipment nameplate calls for 1.25 A before fitting. Using a different current rating defeats the protection scheme and creates a fire or shock hazard.

How it compares

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

Price $12.99
Cheaper than about 90% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameEATON BUSSMANN

Questions about this item

What comes in the pack and is a fuse holder needed separately?

The pack contains five 1.25 A ceramic fuses measuring 20 mm by 5 mm; a compatible HTB-series fuse block is not included and must be purchased separately.

Which rating should I choose for a 250 V AC circuit needing time-delay protection?

Choose the S505-1.25-R version rated 1.25 A at 250 V AC with a 1.5 kA interrupt rating and time-delay characteristic for that application.

What does the 1.5 kA interrupt rating mean once the fuse is installed?

It means the fuse can safely break a fault current up to 1.5 kA at 250 V AC without rupturing, protecting the circuit during a short-circuit event.

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