Fuses

Fuses are made of a ceramic or glass cylinder, with a central metal wire inside. Used to protect the circuits of your electronic devices against short circuits and overloads.

If your fuse blows, it must be replaced by a new fuse of the same type. If the power fails on your hot tub, to ensure that the fuse's wire (which is not always visible, especially on ceramic fuses) is broken, you have to to test them one by one to determine which one (if any) is responsible for opening the circuit.

Fuses are divided into two categories:

Slow-Blow, or time-delayed
This fuse is used to start a device, since it "handles" the transient overcurrent when you power up a pump, for example. This type of fuse is designed to withstand these very short bursts of high intensity.

Fast-Blow
This type of fuse where power surges are damaging or dangerous, even very short ones. It is a very effective protection against the effects of short-circuiting. The fast-blow fuse melts as soon as the current flowing through it exceeds the set value.