I bet Kay is right.I betcha one of those breakers is your main. My sub boxes look like there's no main, but two of the regular bays are ******* by the main.
You could insert a shutoff in the power line.

My fuse panel doesn’t have a main shutoff only individual circuit breakers. I know I could replace the entire panel. Are their other options?
The OP stated the fuse panel has breakers which makes no sense. Guessing it is a breaker panel. More information is needed as others have noted. The brand of the panel would be good to know along with the rest.Is this a fuse panel or breaker panel?
How many circuits?
Have any pics?
20+ months later, welcome back OP.This is a breaker panel that was installed by previous owner in a workshop comes directy from meter on power pole in the yard
huh?You could insert a shutoff in the power line.
This is a breaker panel that was installed by previous owner in a workshop comes directy from meter on power pole in the yard

crazy how it took that long for a reply20+ months later, welcome back OP.
Can you take some pictures?
And if the OP's panel is not already set up this way, he may be able to get a breaker hold down and use this approach.I betcha one of those breakers is your main. My sub boxes look like there's no main, but two of the regular bays are ******* by the main.