Siemens 6ES7407-0DA02-0AA0 PS407 4A power supply module is designed for the SIMATIC S7-400 PLC family, delivering 5 V DC at up to 4 A to the system electronics. It accepts a wide input range of 120/230 V AC with a power loss of about 20 W. An optional backup battery (1× lithium AA, 3.6 V, 2.2 Ah) can be installed to preserve memory during power interruptions.
