Motor driven appliance and protection method thereof

A motor driven appliance comprising:

• a) a motor;
• b) a first switching module and a second switching module that are provided on a current path from one terminal of an energy source to another terminal of the energy source, and are connected in series to each other;
• the first switching module connected to the motor and adapted to drive the motor, the second switching module connected to a user-input;
• and
• c) a control unit connected to the first switching module and the second switching module;
• the control unit adapted to control the first switching module and the second switching module separately;
• wherein the control unit is further adapted to, upon its energization, control the second switching module to be in a cut-off state until the control unit determines that the first switching module is normal and that the second switching module is normal, and wherein the second switching module remains in the cut-off state unless the user-input is activated;
• wherein the control unit is further adapted to determine if the first switching module and the second switching module are normal based on a voltage of the energy source and a divided voltage;
• and
• wherein the control unit is further adapted to determine if a cut-off switching element in the second switching module is short-circuited, by comparing the divided voltage with a fraction of the voltage the energy source.