The design approach employed by ComNet for equipment mounted within the card cage rack unit (C1-CH) with modular power supply (C1PS), provides for the elimination of a single-point failure in the event of a major fault within any module located within the chassis rack. This is accomplished through the use of automatic electronic current limiting within each rack mountable module, rather than providing the current limiting within the power supply unit which supports the power requirements for equipment located within the rack.