APC Rack Automatic Transfer Switch AP4423 - Redundant switch (rack-mountable) - AC 230 V - Ethernet 10/100, RS-232, USB - output connectors: 9 - 1U - black - for P/N: AR106SH6, AR109SH4, AR109SH6, AR112SH4, AR112SH6, SCL400RMJ1U, SCL500RMI1UNC