Technical data, mounting, wiring
PS1111-2403-0000
19
Version: 1.0
3.10
Lifetime expectancy
The lifetime expectancy shown in the table indicates the minimum number of operating hours (service life)
and is determined by the lifetime expectancy of the built-in electrolytic capacitors. The lifetime expectancy is
stated in operating hours and is calculated according to the specifications of the capacitor manufacturer.
Please note: The manufacturer of the electrolytic capacitors only guarantees a maximum life of up to 15
years (131,400h). Any number exceeding this value represents a calculated theoretical lifetime which can be
used to compare devices.
AC 100V
AC 120V
AC 230V
Lifetime
expectancy
39,000h
64,000h
102,000h
At 24V, 3.8A and +40°C
260,000h
292,000h
309,000h
At 24V, 1.9A and +40°C
91,000h
147,000h
287,000h
At 24V, 3.8A and +25°C
640,000h
720,000h
815,000h
At 24V, 1.9A and +25°C
3.11
MTBF
MTBF stands for
M
ean
T
ime
B
etween
F
ailure, which is calculated from the statistical failure rate of the
components and indicates the reliability of a device. It is a statistical representation of the probability of
equipment failure and does not necessarily represent the service life of a product.
The MTBF number is a statistical representation of the probability of equipment failure. An MTBF number of
1,000,000h, for example, means that statistically, if there are 10,000 devices in use, one device will fail every
100 hours. However, it is not possible to say whether the failed device has been in operation for 50,000
hours or only 100 hours.
For these device types the MTTF value (
M
ean
T
ime
T
o
F
ailure) is identical to the MTBF value.
AC 100V
AC 120V
AC 230V
MTBF SN 29500,
IEC 61709
1,127,000h
1,222,000h
1,446,000h At 24V, 3.8A and 40°C
2,161,000h
2,310,000h
2,642,000h At 24V, 3.8A and +25°C
MTBF MIL HDBK
217F
721,000h
730,000h
670,000h
At 24V, 3.8A and 40°C; Ground Benign GB40
1,042,000h
1,055,000h
977,000h
At 24V, 3.8A and 25°C; Ground Benign GB25
210,000h
215,000h
211,000h
At 24V, 3.8A and 40°C; Ground Fixed GF40
276,000h
282,000h
281,000h
At 24V, 3.8A and 25°C; Ground Fixed GF25
