The main topic of this diploma thesis is the dice slot machine. My main focus is the optimisation of protection devices operation, which in the case of electrical overcurrent or overvoltage ensure the automatic shut off of the slot machine in the shortest possible time. The slot machine has 6 protections: basic electronic current protection, additional electronic current protection, short circuit protection, basic software circuit protection, thermal software protection and protection in case of overvoltage from the DC/DC converter. All of the above mentioned protections were described in detail and parameters, which enable fast and reliable operation, were introduced. Finally, I have performed a functional experiment to evaluate and confirm the operation of protections.