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

422,000h

445,000h

590,000h

At 24V, 20A and +40°C

790,000h

832,000h

1,060,000h

At 24V, 20A and +25°C

MTBF MIL HDBK 217F

 

186,000h

191,000h

226,000h

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

256,000h

263,000h

313,000h

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

40,000h

42,000h

50,000h

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

53,000h

55,000h

67,000h

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