A power supply with arc flash protection mechanism, comprising: a first power connector including a plurality of power terminals and a first detecting terminal , wherein said plural power terminals are configured to couple with a plurality of power terminals of a second power connector , and said first detecting terminal is configured to couple with a second detecting terminal of said second power connector and provide a detecting signal indicative of whether said second power connector is being disconnected with said first power connector ; a power conversion circuit electrically coupled to said power terminals of said first power connector for receiving an input voltage (V in ) and converting said input voltage (V in ) into an output voltage (V o ); a control unit electrically coupled to said power conversion circuit for controlling the operation of said power conversion circuit ; and a connection status detection circuit electrically coupled to said control unit and said first detecting terminal of said first power connector for generating a power connection status signal (V a ) to said control unit according to said detecting signal; characterized in that , when said first detecting terminal of said first power connector is disconnected from said second detecting terminal of said second power connector , said power connection status signal (V a ) is under disable status and said control unit is configured to control said power conversion circuit not to generate or output said output voltage (V o ) to a load according to said power connection status signal (V a ) so that no current flows between terminals of said first power connector and said second power connector . a first power connector including a plurality of power terminals and a first detecting terminal , wherein said plural power terminals are configured to couple with a plurality of power terminals of a second power connector , and said first detecting terminal is configured to couple with a second detecting terminal of said second power connector and provide a detecting signal indicative of whether said second power connector is being disconnected with said first power connector ; a power conversion circuit electrically coupled to said power terminals of said first power connector for receiving an input voltage (V in ) and converting said input voltage (V in ) into an output voltage (V o ); a control unit electrically coupled to said power conversion circuit for controlling the operation of said power conversion circuit ; and a connection status detection circuit electrically coupled to said control unit and said first detecting terminal of said first power connector for generating a power connection status signal (V a ) to said control unit according to said detecting signal; characterized in that , when said first detecting terminal of said first power connector is disconnected from said second detecting terminal of said second power connector , said power connection status signal (V a ) is under disable status and said control unit is configured to control said power conversion circuit not to generate or output said output voltage (V o ) to a load according to said power connection status signal (V a ) so that no current flows between terminals of said first power connector and said second power connector . <EOS>