We no longer carry APC Rack Automatic Transfer Switch - redundant switch (1557653), but we found this replacement for you.
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The APC Netshelter Rack Automatic Transfer Switch AP4433A is a rack-mountable redundant switch in black. With emergency power-off features like humidity monitoring, LCD display, LED indicators and a temperature sensor, this automatic transfer switch has a one-phase transfer backup, featuring 2 input and 12 output ports. It comes with an 8 ft. integrated power cable and an external serial cable, along with a mounting kit and rack mounting brackets for easy installation.