DC Power Supply 20V/42A/850W. The Keithley 2268-20-42 is a DC Power Supply with 850 W, max. voltage output 20 V and max. current output 42 A. It is a compact 1U, half-rack enclosure and provides the highest power in the smallest package. Two auxiliary outputs support driving or signaling external devices, often eliminating the need for additional instrumentation Isolated analog inputs minimize control line noise Built-in LAN, USB, GPIB, RS-232, RS-485 interfaces and analog inputs are all standard Constant voltage, constant current, and constant power setting control Auto sequence control supports internal execution of commands to minimize bus communication time Control up to 30 supplies through a single controller Interface Foldback mode with programmable delay shuts down the output on transitions between CV and CC operation to protect voltage- or current-sensitive devices Numerous safety features protect the load and the supply, including over-voltage and under-voltage protection, over-current protection, over-temperature protection, loop protection for multiple-supply configurations, and a hardware output interlock