All parameters are specified at 24V, 10A, 230Vac, 25°C ambient and after a 5 minutes run-in time, unless noted otherwise.
Rockwell Automation Publication 1606-RM044A-EN-P — March 2014
11
Bulletin 1606 Switched Mode Power Supplies
10. Reliability
AC
100V
AC 120V
AC 230V
Lifetime expectancy
*)
58 000h
68 000h
71 000h
at 24V, 10A and 40°C
117 000h
122 000h
117 000h
at 24V, 5A and 40°C
165 000h*)
192 000h*)
200 000h*)
at 24V, 10A and 25°C
MTBF
**)
SN 29500, IEC 61709
478 000h
535 000h
581 000h
at 24V, 10A and 40°C
827 000h
926 000h
1 005 000h
at 24V, 10A and 25°C
MTBF
**)
MIL HDBK 217F
334 000h
341 000h
345 000h
at 24V, 10A and 40°C; Ground
Benign GB40
460 000h
469 000h
474 000h
at 24V, 10A and 25°C; Ground
Benign GB25
*) The
Lifetime expectancy
shown in the table indicates the minimum operating hours (service life) and is determined by the lifetime
expectancy of the built-in electrolytic capacitors. Lifetime expectancy is specified in operational hours and is calculated according to the
capacitor’s manufacturer specification. The manufacturer of the electrolytic capacitors only guarantees a maximum life of up to 15 years
(131 400h). Any number exceeding this value is a calculated theoretical lifetime which can be used to compare devices.
**)
MTBF
stands for
M
ean
T
ime
B
etween
F
ailure, which is calculated according to statistical device failures, and indicates reliability of a
device. It is the statistical representation of the likelihood of a unit to fail and does not necessarily represent the life of a product.
The MTBF figure is a statistical representation of the likelihood of a device to fail. A MTBF figure of e.g. 1 000 000h means that
statistically one unit will fail every 100 hours if 10 000 units are installed in the field. However, it’s impossible to determine if the failed
unit has been running for 50 000h or only for 100h.