There have been a couple of comments from electricians earlier, but we need to be clear on what definitions mean:
Power surge: This is a rapid rise in power consumption from the connection of a large load such as a motor or some other device that needs a large current to start. This ‘surge’ is short lived and, unless the circuit protection activates, it will pass. It is dangerous as it can stress the electrical system causing overheating and insulation failure.
Overload: This is when to much load is connected to the circuit, unlike a ‘surge’ it is not short lived. This will cause problems with the wiring, possibly overheating and eventual breakdown of the insulation. If the protective device is correct it will disconnect. Unfortunately, with older rewardable fuses there is great danger as people will do their own fuse wire replacement, quite often the wrong type - I have even seen electrical wire instead of fuse wire - so will not ‘blow’. Circuit breakers also need to be correctly rated, a 20-amp breaker will not protect a circuit if the breaker is not the right size,
Earth Leakage: This is when the RCD trips the circuit because, as the description says, there is an earth leakage. There is always some earth leakage, and if the existing earth leakage is high enough there will be nuisance tripping because it does not take much to reach the very small current needed for the RCD to operate. Earth leakage circuit breakers (RCD) should NOT just replace existing protective devices (ie pull out the old device and install the RCD), the wiring system needs to be checked to make sure the earth connection to the most distant power point is adequate, this can be checked by measurement of the earth wire resistance or using an RCD tester. You need an electrician to do this.
In summary, don’t try to guess what is causing the problem, get the appliance causing the trip checked and do NOT assume your house wiring is not the problem. In my experience many houses have faulty wiring, and some even have dangerous wiring!