Paul C. Buff, Inc. Technical Forum

I was looking at the spare fuse that is with each Einstein I bought, and was thinking about people who have had fuses blow without a good explanation, and thought it might be a good idea to have a few spares on hand. So, with minimal information, I did a little research. Since I am ordering a bunch of other electrical components (other job), I wanted to add fuses to the order.
The spare fuse I have is a Littlefuse 373 Series TR5® Subminiature Fuse, 8A 250v.
According to its data sheet, this is described as a fast acting fuse. Although it appears to be quite slow, time wise.
The slow acting fuse is the 383 series.

Could something have become mixed up or have I found the wrong thing?

Android,

The Type 373 fuse is the correct fuse for the Einstein. The time delay fuse will of course work, but is not required because the Einstein does not contain a power transformer that will exhibit very high inrush current when the power is applied. In my experience, when the Einstein's fuse blows, it is because there is something amiss: a flash tube insulator not correctly replaced, or a damaged or defective component, for example. It is human nature to replace a blown fuse, and there is a very small chance that some transient event has caused the fuse to blow, but if the second fuse blows, it's time to return the unit for some TLC.