[86 ssinit]

Hey Shaun the 100 amp breaker is to the left of your panel? If so shut it off open the metal enclosure check wires coming off breaker make sure they are dead. Remove wires and replace breaker. Go inside run all your devices see if it trips. If all is well it was the breaker. If not it is something else in the house. I don't have that type of a system with the main outside the house in my house you have to pull the meter to kill the power at the main.