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

595,000h

611,000h

704,000h

At 24V, 20A and 40°C

1,090,000h

1,116,000h

1,252,000h

At 24V, 20A and +25°C

MTBF MIL HDBK 217F

 

274,000h

275,000h

289,000h

At 24V, 20A and 40°C; Ground Benign GB40

368,000h

370,000h

386,000h

At 24V, 20A and 25°C; Ground Benign GB25

59,000h

59,000h

63,000h

At 24V, 20A and 40°C; Ground Fixed GF40

76,000h

76,000h

80,000h

At 24V, 20A and 25°C; Ground Fixed GF25