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Five glass tube fuses, cylindrical, silver end caps, 20mm long, 5mm diameter

Bussmann

Bussmann S506-1.25-R Glass Fuse 1.25A 250V 35A 5 PK

SKU CH-TC55-TNZ32

A pack of five glass time-delay fuses rated 1.25 A at 250 V AC with a 35 A interrupt rating

  • Time-delay action prevents nuisance trips
  • 25 A rating protects low-current circuits
  • 35 A interrupt capacity at 250 V AC
  • Glass body allows visual inspection
  • Pack of five supplies ready spares

Circuit Protection for Low-Current Circuits

The Bussmann S506-1.25-R is a time-delay glass fuse rated at 1.25 amps and 250 volts AC. It comes in a pack of five for spares or multiple installations. Suitable for equipment needing a 20 mm by 5 mm cylindrical fuse.

Build Integration and Compatibility

This fuse fits standard 20 mm by 5 mm fuse holders and compatible HTB series fuse blocks. Its non-rejection body style allows simple insertion without keyed slots. The 35 amp interrupt rating at 250V AC handles fault currents safely. It frees up design space with its compact cylindrical glass body.

Upgrade Context and Replacement Value

It serves as a direct replacement for Bussmann GDC, S506, Littelfuse 218 and Mersen GDG series fuses. The jump is worth it when existing fuses lack cURus, IMQ or MITI/JET certifications. Not for buyers needing higher amperage ratings or rejection-type fuse bodies.

How it compares

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

Price $13.99
Cheaper than about 88% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameEATON BUSSMANN

Questions about this item

How long does the 20 mm glass body last under continuous 1.25 A load before the time-delay element opens?

The fuse is a single-element, time-delay type rated 1.25 A at 250 V AC; it will carry the rated current indefinitely and only opens on sustained overloads beyond its I²t curve.

How much heat does the 5 mm diameter fuse dissipate when running at full rating inside an HTB fuse block all day?

At 1.25 A the voltage drop across the glass tube is low, so heat stays minimal; the cylindrical body and HTB block provide enough surface area for passive cooling in normal ambient conditions.

Which fuse block series must I already have to mount these 20 mm × 5 mm cylindrical fuses?

The compatible fuse block series is HTB, designed for the 20 mm length and 5 mm diameter of the S506 series glass fuses.

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