A switch assembly comprising a switch and a servo drive system for the switch , the servo drive system including - a drive shaft connecting the servo drive system to the switch ; - a motor for driving the switch ; - a power section for supplying power to the motor ; and - a feedback system , which is designed - to determine at least two values for an absolute position of the drive shaft - to generate a feedback signal on the basis of the at least two values; and - a control unit which is designed as a programmable safety controller and is designed - to control the power section depending on at least one desired value; - to influence an operation of the motor depending on the feedback signal; and - to identify the presence of at least one safety-relevant event and, in the case of the safety-relevant event, to transmit at least one control signal to the power section ; - wherein the power section is designed to initiate or carry out at least one safety action depending on the control signal; characterized in, that - the control unit includes a first and second processor unit ; and - is designed to run a program in order to implement a switching command for the switch , wherein the first and second processor unit run the program in parallel; - is designed to carry out at least one reconciliation between the first and the second processor unit whilst the program is being run; - is designed to initiate a safety action, depending on a result of the reconciliation, wherein the safety action includes - a safe stopping of the motor or - a blocking or shutdown of the power section or - a tripping of a circuit breaker that connects or disconnects the equipment to a power network. - a drive shaft connecting the servo drive system to the switch ; - a motor for driving the switch ; - a power section for supplying power to the motor ; and - a feedback system , which is designed - to determine at least two values for an absolute position of the drive shaft - to generate a feedback signal on the basis of the at least two values; and - to determine at least two values for an absolute position of the drive shaft - to generate a feedback signal on the basis of the at least two values; and - a control unit which is designed as a programmable safety controller and is designed - to control the power section depending on at least one desired value; - to influence an operation of the motor depending on the feedback signal; and - to identify the presence of at least one safety-relevant event and, in the case of the safety-relevant event, to transmit at least one control signal to the power section ; - to control the power section depending on at least one desired value; - to influence an operation of the motor depending on the feedback signal; and - to identify the presence of at least one safety-relevant event and, in the case of the safety-relevant event, to transmit at least one control signal to the power section ; - wherein the power section is designed to initiate or carry out at least one safety action depending on the control signal; - the control unit includes a first and second processor unit ; and - is designed to run a program in order to implement a switching command for the switch , wherein the first and second processor unit run the program in parallel; - is designed to carry out at least one reconciliation between the first and the second processor unit whilst the program is being run; - is designed to initiate a safety action, depending on a result of the reconciliation, wherein the safety action includes - a safe stopping of the motor or - a blocking or shutdown of the power section or - a tripping of a circuit breaker that connects or disconnects the equipment to a power network. - a safe stopping of the motor or - a blocking or shutdown of the power section or - a tripping of a circuit breaker that connects or disconnects the equipment to a power network. <EOS>