4 Reasons Why Circuit Breakers Trip and Fuses Blow Author: Bob Formisano The Function of Circuit Breakers and Fuses. The electrical system in every home features a system Overloaded Circuit. An overloaded circuit is the most common reason for a circuit breaker tripping. Short Circuit. A short circuit is a more serious reason for a breaker tripping. A "hard short" is caused Ground Fault. A particular type of short circuit, a "ground-fault," occurs if a hot wire comes in See all full list on thespruce How to Fix a Blown Fuse | Repair and DIY | Home Matters AHS Turn off the main power switch to disconnect power to the fuse box. Now, you need to locate the blown fuse. Check the labeled area that corresponds to the part of the house that lost power. A blown fuse may be discolored, cloudy, or have a melted or broken metal piece inside.