One of the best parts of relaxing in your spa is being able to enjoy all of its relaxing features. When a feature of your spa stops working, there is often a simple solution. An outdated or blown fuse can be the source of a feature malfunction in your spa. Luckily, fuses are easy to replace. The 100mA (0.1A) Slow Blow Fuse is a power input fuse on your spa’s PC board that provides power to the rest of your spa and all of its features. This particular type of fuse is designed to allow a more powerful power current to flow without blowing. A new 100mA (0.1A) Slow Blow Fuse can be a simple fix to a problem in your spa.