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 small white ceramic cylinder fuses with metal end caps lying together

Bussmann

Bussmann S501-250-R Ceramic Fuse 250mA 1.5kA 250V AC 5 pack

SKU CH-MPJY-NBR72

Ceramic fast-acting fuse rated 250 mA at 250 V AC with a 1.5 kA interrupt capacity, supplied in a pack of five

  • Fast-acting protection clears faults quickly
  • 5 kA interrupt rating at 250 V AC handles high fault currents
  • Ceramic body resists heat and shattering
  • 20 mm × 5 mm cylindrical size fits standard holders
  • Pack of five provides ready spares

Circuit protection fuse pack

This pack contains five ceramic fuses from the Bussmann S501 series rated at 250 mA and 250 V AC. Each fuse provides fast-acting, non-indicating protection with a 1.5 kA interrupt rating at the rated voltage. The cylindrical body measures 20 mm long by 5 mm in diameter and fits compatible HTB fuse blocks. Supplied new in a pack of five.

For low-current AC circuits

These fuses suit technicians and hobbyists protecting control circuits, instrumentation or small appliances that draw 250 mA or less at 250 V AC. Buyers who need higher current ratings, a different interrupt capacity or an indicating fuse should look at other series. The ceramic body and single-element construction are fixed characteristics of this part.

1.5 kA interrupt rating at 250 V AC

The interrupt rating is the critical specification that determines whether this fuse can safely clear a fault on your circuit. Verify that the prospective short-circuit current at the installation point does not exceed this value. All other dimensions and ratings follow from the S501 series definition.

How it compares

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

Price $15.99
Cheaper than about 85% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameEATON BUSSMANN

Questions about this item

How do I install these 20 mm × 5 mm cylindrical ceramic fuses into an HTB fuse block without damaging the caps?

Align each fuse squarely with the HTB block clips and press straight in until the metal end caps seat fully; angling the fuse during insertion can crack the ceramic body.

When should I replace a fuse from this 5 pack after it has operated?

Replace the fuse immediately after it interrupts a fault; the fast-acting, single-element design is non-indicating, so visual inspection cannot confirm whether the element remains intact.

What is the maximum fault current these fuses can safely interrupt at 250 V AC?

The interrupt rating is 1.5 kA at 250 V AC; sustained faults above that level can exceed the ceramic body's breaking capacity.

More in Breakers & Circuit Protection

Similar items