Test power transformer - input wiring
As winny commented, 

Connect blue (neutral) to the "0v" connection.

Connect brown (line/live/hot) to the "240v" connection.

Your nominal 240V supply is actually now a nominal 230V +10%/-5%. So your local electrical utility can supply you with any voltage between 218.5V and 253V.

Last time I measured mine it was 237V but it varies a bit from day to day. The "240v" connection is a good one to choose if you are unsure.

It would be prudent to reduce the size of your fuse to the lowest value needed to support the load (load current * load voltage / supply voltage)