Abstract: A printed circuit board connection system provides multiple voltage level interconnection to each individual printed circuit board of a multiple board system via a common circuit board connector mounted on a backplane. Power supply and logic signals at each required voltage level are supplied to electrically isolated regions of the backplane, and are then connected via edge connectors to process control circuits on the respective printed circuit boards. A circuit board extraction handle includes an automatic disabling switch actuator to facilitate circuit board maintenance while power is on.