Bussmann S506-1-R 1A 250V Time-Delay Glass Fuse 5 Pack line protection

Circuit Protection for Low-Current Circuits

The Bussmann S506-1-R is a 1A, 250V AC glass fuse designed for line protection in electrical equipment. It suits technicians and hobbyists needing reliable overcurrent protection for control circuits or small appliances. The time-delay characteristic prevents nuisance opening during brief inrush currents. This pack contains five cylindrical fuses measuring 20mm in length and 5mm in diameter.

Sustained Load Behaviour and Interrupt Rating

Under continuous operation at rated current, the fuse carries 1A without opening. The time-delay element tolerates temporary overloads, allowing motors or transformers to start without tripping. If a fault exceeds the design limit, the interrupt rating of 35A at 250V AC ensures the glass body breaks the circuit safely. The single-element construction provides a predictable response to sustained overcurrent conditions.

Installation Notes and Common Issues

The 20mm x 5mm cylindrical body fits standard fuse clips and compatible HTB series fuse blocks. No special tools are required; the fuse presses into place. A common error is substituting a fast-acting fuse, which removes the inrush tolerance this time-delay model provides. Verify the circuit voltage does not exceed 250V AC and that the 35A interrupt rating meets the available fault current. The glass body allows visual inspection of the element.