Technical data, mounting, wiring
PS1111-2402-0002
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.
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
115,000h
131,000h
148,000h At 24V, 2.5A and +40°C
260,000h
263,000h
263,000h At 24V, 1.25A and +40°C
324,000h
370,000h
419,000h At 24V, 2.5A and +25°C
734,000h
744,000h
744,000h At 24V, 1.25A 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
1,797,000h
1,858,000h 1,982,000h At 24V, 2.5A and 40°C
3,093,000h
3,186,000h 3,378,000h At 24V, 2.5A and +25°C
MTBF MIL HDBK
217F
868,000h
886,000h
803,000h At 24V, 2.5A and 40°C; Ground Benign GB40
1,257,000h
1,278,000h 1,175,000h At 24V, 2.5A and 25°C; Ground Benign GB25
247,000h
252,000h
247,000h At 24V, 2.5A and 40°C; Ground Fixed GF40
325,000h
331,000h
328,000h At 24V, 2.5A and 25°C; Ground Fixed GF25
