The uSDC or Micro-Shut-Down-Controller is an electronically controlled automotive power switching device. It is primarily designed for the purpose of starting up or shutting down a personal computer used in a motor vehicle. It interfaces with a computer motherboard's power switch header that would normally connect to the push-button switch on the front of a personal computer case. The uSDC includes a high current relay that will cut off or apply all power to the power supply of the personal computer to prevent any substantial current draw when the computer is not in use. The uSDC also provides a timing mechanism that is user selectable allowing the computer to remain "on" for an amount of time after the ignition has been turned off. The uSDC allows the user to mount the personal computer in remote locations (such as a trunk) and provides hands off method automating the start-up and shutdown sequence while constantly monitoring the environmental conditions.