APC AP-7723 Automatic Transfer Switch. This is the high amp variant that has two C20 inputs, one C19 outout and eight C13 outputs. Included are two C19-C20 supply cables. I have tested the power inputs and outputs of the device and the switching capability on the inputs. I have been unable to test the management side – no response on serial port and nothing on the LED indicator – but I don’t think this affects its power transfer switching capability. Due to this I can’t say it’s in full working order and I have reflected this in the price. It is a clean unit, recently decommissioned from a clean-air data centre.