Many computer applications such as banking and ticket reservation systems require a fault-tolerant computer that is continually on-line. Thus, the connection and disconnection of modules to a bus must be done without shutting down the system.
When a load is connected to an energized bus a voltage drop caused by the sudden appearance or disappearance of the load can cause damage to data or other components of the system. Further, when the load is disconnected from an energized bus arcing across the contacts damages and reduces the useful life of the contacts. Additionally, a fault in one component of the system can cause excess current flow that may damage the component.
Accordingly, a need exists for obviating the problems caused by connecting and disconnecting loads to an energized bus for preventing faults from affecting an entire system.