How do fuses prevent fire - Answers Aug 27, 2014The fire is non toxic. So the fuse will blow it away. If an appliance is overheating or short-curcuiting, it could catch fire. A fuse, of the correct amps, is designed to blow before any damage is What Causes a Breaker Box to Catch Fire? | Hunker Degraded components are faulty and will eventually cause sparking and possibly fire, according to K.I. Security Enterprises. Although an electrical breaker box is designed for safety, it is not entirely fireproof. Sparks inside the box can set it on fire, and the fire can spread throughout your home quickly. Breakers are simple to inspect.