tumbledryer keeps tripping house circuit switch?

hi if you mean the MCB keeps tripping then u are overloading the circuit as the MCB is there to protect the cables feeding your power suppply
If you meant the RCD is tripping thenyou have an earth fault probably between neutral and earth probably caused by damp
If the MCB is adequate then again you could have a fault on the appliance

dave A & D Telephone & electrical 0770 841 6085
November 2008