The Siemens 6ES7407-0DA02-0AA0 is the entry-level PS 407 universal-input power supply for the SIMATIC S7-400 PLC platform. Accepting both 120/230 V AC and DC input, it delivers 4 A at 5 V DC and 0.5 A at 24 V DC to the backplane bus in a single 25 mm slot.

Key Features

• Universal input: 120/230 V AC (85–264 V, 47–63 Hz) or 120/230 V DC (88–300 V) — one supply for global mains standards
• Delivers 4 A at 5 V DC for backplane bus and 0.5 A at 24 V DC for auxiliary circuits
• Occupies a single slot at just 25 mm wide — maximizes rack space for I/O modules
• 20 ms mains buffering bridges short power interruptions without CPU reset
• Galvanic isolation between primary and secondary sides for signal integrity
• Short-circuit-proof and idling-proof 24 V output
• Supports optional backup battery (1× or 2× lithium AA, 3.6 V) for CPU data retention
• ATEX, IECEx, CE, UL, and UKCA certified for global deployment

Technical Data

Applications

The PS 407 is the go-to power supply for standard S7-400 PLC installations where AC or DC mains power (120/230 V) is readily available — factory automation lines, machine control cabinets, and building management systems. The 4 A variant is sized for small to medium I/O configurations. For installations with only 24 V DC available, the PS 405 series (6ES7405-0DA02) provides a DC-only alternative.