Technical data, mounting, wiring
PS2031-2410-0000
19
Version: 1.0
3.8
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.
3AC 400V
3AC 480V
MTBF SN 29500,
IEC 61709
975,000h
985,000h
At 24V, 10A and 40°C, 3-phase operation
1,706,000h
1,723,000h At 24V, 10A and 25°C, 3-phase operation
925,000h
939,000h
At 24V, 10A and 40°C, 2-phase operation
1,633,000h
1,656,000h At 24V, 10A and 25°C, 2-phase operation
MTBF MIL HDBK
217F
444,000h
428,000h
At 24V, 10A and 40°C, 3-phase operation, Ground Benign
GB40
584,000h
563,000h
At 24V, 10A and 25°C, 3-phase operation, Ground Benign
GB25
100,000h
100,000h
At 24V, 10A and 40°C, 3-phase operation, Ground Fixed GF40
132,000h
132,000h
At 24V, 10A and 25°C, 3-phase operation, Ground Fixed GF25
436,000h
423,000h
At 24V, 10A and 40°C, 2-phase operation, Ground Benign
GB40
555,000h
572,000h
At 24V, 10A and 25°C, 2-phase operation, Ground Benign
GB25
98,000h
98,000h
At 24V, 10A and 40°C, 2-phase operation, Ground Fixed GF40
129,000h
129,000h
At 24V, 10A and 25°C, 2-phase operation, Ground Fixed GF25
