Safety switch arrangement

A safety switch arrangement for switching on and off a power supply of a tool, said safety switch arrangement comprising:

• two actuators, each actuator being switchable between an “on” state and an “off” state;
• a code generator connected to said two actuators, said code generator issuing a numerical word that is divided into two partial words each having a value, each partial word being influenced by a respective one of said two actuators wherein values for the partial words are changed continuously when the actuators are activated to the “on” state and wherein when an actuator is deactivated to the “off” state, the partial word influenced by that actuator assumes a predetermined fixed value;
• and
• an evaluation unit for checking the switching states of said two actuators by synchronously reading the respective partial words of said two actuators , wherein the power supply is switched on only when both said two actuators are activated to the “on” state and the partial words, prior to the activation of the actuators, respectively correspond to the predetermined fixed value.