... Key words: PDU, with proteccion of 32 A, 16 A, 10 A, with Schneider air switch I. ... There are different models: DC Power Distribution Unit (for 10 lines, with alarm), AC/DC ... alarm), AC/DC Power Distribution Unit (without alarm), AC Power Distribution Unit (with display of voltage and current ... main power and 1-backup power. Security control unit adopts automatic air switch. It is with alarm ...