A fuse that is rated for 10 amps will:

A fuse rated for 10 amps is designed to allow current flow up to that limit before it blows, effectively protecting the circuit from overcurrent conditions. When functioning normally, this fuse will permit currents that are below its rating without interruption.

The key point is that the fuse will start to respond as the current approaches its rated capacity. Generally, fuses have a tolerance and may handle a small overload for a limited time. However, once the current exceeds 10 amps significantly, the fuse will heat up to the point where it will break the circuit to prevent damage from overheating or fire.

This behavior ensures that the fuse serves its purpose as a protective device, allowing normal operation within specified limits while safeguarding the circuit from excess current that could create hazards.