Why might our main fuse keep tripping?

You have a faulty appliance plugged in, or you're using more electricity than the power outlets can handle. Someone might be stealing your electricity!

A few more details would produce better responses, it just could be a faulty or damaged circuit breaker. A current test would be the first thing to check, normally that isn't a problem if you don't have resistive electric heat.

Circuit breakers used for residential service are classified as thermal magnetic breakers, they trip due to magnetism from high inrush, or they trip from heat. The design intent is that current through the breaker will develop the heat relative to current. But it could be heat from a wire termination on the main breaker that isn't tight, resulting in higher resistance which results in extra heat. Be very careful if you choose to remove the panel cover for inspection.

Or there may be or may have been water leaking into the panel that has damaged the breaker, or sometimes things just fail or weren't up to quality standards to begin with.

If its a familiar circuit breaker on the particular ring important you have the subject with then its in all danger an intermittent short between the stay and earth/independent wires interior the hoop important itself. probably led to with the help of a few dodgy insulation on the wires. now and lower back human beings can placed a nail with the aid of the cord even yet it does not continually coach immediatly and could reason this way of project. you may desire to get it checked right whether it form of feels to return back ok because it ought to reason a fire!!