The compressor electrical panel is one of the most important parts of the compressor system, because it contains electrical controls and components that regulate the operation of the compressor, and this includes things such as starting the electric motor, preventing overload, controlling relays and other necessary electrical devices. For the safe and efficient operation of the compressor, the purpose of each compressor control panel is to match the compressed air with the compressed air demand as much as possible. Old-style electro-pneumatic controls have been replaced by microprocessor-based controls and software updates to optimize system and control parameters. Each type of control can be classified into one of two categories: fixed speed controls and variable speed controls