20
21
-1
1
22
Power Supply PS1000-A6-24.20.R
MTBF
13
MTBF
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 cannot be determined if the failed unit
has been running for 50 000h or only for 100h.
For these types of units the MTTF (
M
ean
T
ime
T
o
F
ailure) value is the same value
as the MTBF value.
AC 100V
AC 120V
AC 230V
MTBF SN 29500, IEC 61709
387 000h
412 000h
543 000h
At 20A and 40°C
723 000h
768 000h
976 000h
At 20A and 25°C
MTBF MIL HDBK 217F
164 000h
169 000h
199 000h
At 20A and 40°C;
Ground Benign GB40
224 000h
231 000h
272 000h
At 20A and 25°C;
Ground Benign GB25
34 000h
36 000h
42 000h
At 20A and 40°C;
Ground Fixed GF40
45 000h
47 000h
56 000h
At 20A and 25°C;
Ground Fixed GF25