The Siemens 6ES7407-0KR02-0AA0 is a redundant-capable PS 407 universal-input power supply for the SIMATIC S7-400 PLC platform. It delivers 10 A at 5 V DC and 1 A at 24 V DC to the backplane bus, accepts both 120/230 V AC and DC input, and supports dual-redundant operation — two units in slots 1 and 3 provide automatic fail-safe switchover.

Key Features

• Supports dual-redundant operation — install paired units in slots 1 and 3 for fail-safe power
• Universal input: 120/230 V AC (85–264 V, 47–63 Hz) or 120/230 V DC (88–300 V)
• Delivers 10 A at 5 V DC for backplane bus and 1 A at 24 V DC for auxiliary circuits
• 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 10 A Redundant variant is designed for high-availability S7-400 PLC installations using standard AC/DC mains power — process plants, chemical facilities, and critical infrastructure where power supply failure is not tolerable. Two KR02 units in slots 1 and 3 provide seamless fail-over. For non-redundant applications with the same input flexibility, the 6ES7407-0KA02 provides identical 10 A output in a single-unit configuration.