For grid and substation automation, we have developed rack mounted fanless box PCs used with data gateway and computing platform devices. The UNO-4000 series feature a fanless design. It can be integrated with a wide variety of computing platforms and enhance the effectiveness of power transmission and substation automation. The rear I/O connection and LEDs on front panel for all ports and modes, simplify the monitoring status for operation. The UNO-4000 series not only improve interoperability and interconnectivity, also provide highly reliable functionality to meet the harsh and critical requirements of grid automation and power substation automation.