Can you post the model number please.
Its a Zanussi DE 540X Dishwasher.
Have to go out now (wife Calling!!) Will be back in Morning
Ok if its tripping the electrics out when its filling then its possibley leaking as its filling.
What you need to do is pull the dishwasher out and remove the right hand side panel.
From there you will be able to see in to the appliance.
Check to see if theres any water in the base.
If so drain it out and then look at the back on the right you will see the heater. Disconnect the wires on there and set it going again and see if it still tripping the electrics out. If it doesn't then the heater will need to be replaced.
Leave it disconnected and watch it as it fills and washes and check for any leaks. Look at the plastic tube which runs from the heater up the side to the top as these can split and it leaks as it washes and sprays water over the heater and motor causing it to trip out.
So check them out first and see what you find and let me know.