This set of four Buss Type S 15 Amp fuses are designed to provide reliable and safe circuit protection. The dual element design ensures that the fuses will trip in the event of a short circuit or overload, preventing damage to your electrical equipment. These fuses are suitable for use in a variety of industrial and commercial applications and are compatible with a wide range of electrical equipment. Whether you're looking to protect your machinery, tools, or other equipment, these fuses are an excellent choice.

I am a retired electrician, and these are surplus from my shop.  It appears a couple are new, and a couple are used.  All tested for continuity.  #5 is a bonus!