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

800,000h

807,000h

867,000h

At 24V, 5A and +40°C

1,402,000h

1,414,000h

1,510,000h

At 24V, 5A and +25°C

MTBF MIL HDBK 217F

 

339,000h

343,000h

368,000h

At 24V, 5A and +40°C; Ground Benign GB40

490,000h

496,000h

529,000h

At 24V, 5A and +25°C; Ground Benign GB25

81,000h

83,000h

89,000h

At 24V, 5A and +40°C; Ground Fixed GF40

109,000h

111,000h

119,000h

At 24V, 5A and +25°C; Ground Fixed GF25