Siemens SIMATIC S7-400 Reference Manual page 62

Power supply modules
3.8 Power supply modules PS 407 10A (6ES7407-0KA01-0AA0) and PS 10A R (6ES7407-0KR00-0AA0)
Backup for power failures
Power consumption
Power loss
Backup current
Back-up batteries (option)
Protective separation in accordance with
IEC 61131-2
*PS 407 10A: from product version 5
* PS 407 10A R: from product version 7
62
> 20 ms
at a repeat rate of 1 s, meets NAMUR recommen‐
dation NE 21
105 W, PS 407 10A from product version 5
105 W, PS 407 10A R from product version 7
95 W, PS 407 10A from product version 10
29.7 W
20 W, PS 407 10A from product version 10
maximum of 100 µA when power off
2 x lithium AA,
3.6 V/2.3 Ah
Yes
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08