A-18 is a brand of industrial timer manufactured by Eaton Corporation and includes a modular system consisting of a main processor board, an interconnect board, a control board, a display board and a cover assembly. The main processor board is a circuit board that contains the programming information and timers used to control the industrial processes. The interconnect board is used to connect the main board to other parts of the system. The control board consists of multiple relays, switches, and indicators used to control the timer and associated functions. The display board contains a text-based display panel and LED indicators. Finally, the cover assembly covers and protects the system components.