MTBF

MTBF stands for Mean Time Between Failure, 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 (Mean Time To Failure) is identical to the MTBF value.

 

AC 100V

AC 120V

AC 230V

 

MTBF SN 29500,
IEC 61709

1,174,000h

1,273,000h

1,507,000h

At 24V, 3.8A and 40°C

2,251,000h

2,406,000h

2,752,000h

At 24V, 3.8A and +25°C

MTBF MIL HDBK 217F

 

751,000h

760,000h

698,000h

At 24V, 3.8A and 40°C; Ground Benign GB40

1,085,000h

1,099,000h

1,018,000h

At 24V, 3.8A and 25°C; Ground Benign GB25

219,000h

224,000h

220,000h

At 24V, 3.8A and 40°C; Ground Fixed GF40

288,000h

294,000h

293,000h

At 24V, 3.8A and 25°C; Ground Fixed GF25