For which of the following applications would a fast blow fuse be most suitable?

A fast blow fuse is designed to protect devices that are sensitive to quick overloading, allowing it to interrupt the circuit and prevent damage to the equipment. These fuses have a lower tolerance for overload conditions and react quickly to overcurrent situations. This characteristic makes them ideal for protecting delicate electronic components and devices where even a brief spike in current could lead to failure or damage.

In the context of the other applications, motors typically experience a high inrush current at startup, which would require a slow-blow fuse that can tolerate these brief surges without blowing. Light circuits with low voltages often do not present the risk of quick overloading that necessitates a fast blow fuse, and heating elements generally require a period to heat up; thus, slow-blow fuses are appropriate for these as they can handle the gradual increase in current without interruption. Understanding the specific needs of each application helps in selecting the correct type of fuse for optimal protection.