Technical data, mounting, wiring
PS1021-2405-0000
18
Version: 1.0
3.8
Lifetime expectancy and MTBF
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
181,000h
194,000h
219,000h At 24V, 2.5A and +40°C
511,000h
548,000h
621,000h At 24V, 2.5A and +25°C
66,000h
68,000h
83,000h At 24V, 5A and +40°C
188,000h
193,000h
234,000h At 24V, 5A and +25°C
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.
AC 100V
AC 120V
AC 230V
MTBF SN 29500,
IEC 61709
1,065,000 h 1,147,000 h 1,379,000h At 24V, 5A and +40°C
2,038,000h
2,166,000h 2,519,000h At 24V, 5A and +25°C
MTBF MIL HDBK
217F
681,000h
651,000 h
645,000 h At 24V, 5A and 40°C; Ground Benign GB40
872,000 h
842,000 h
839,000 h At 24V, 5A and 25°C; Ground Benign GB25
165,000 h
164,000 h
168,000 h At 24V, 5A and 40°C; Ground Fixed GF40
206,000 h
205,000 h
211,000 h At 24V, 5A and 25°C; Ground Fixed GF25
