MTBF

MTBF stands for Mean Time Between Failure, which is calculated according to statistical device failures, and indicates 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 figure is a statistical representation of the likelihood of a device to fail. A MTBF figure of e.g., 1,000,000 h means that statistically one unit will fail every 100 hours if 10,000 units are installed in the field. However, it cannot be determined if the failed unit has been running for 50,000 h or only for 100 h.

For these types of units, the MTTF value (Mean Time To Failure) is the same value as the MTBF value.

 

AC 100 V

AC 120 V

AC 230 V

 

MTBF SN 29500, IEC 61709

359,000 h

364,000 h

395,000 h

At 24 V, 10 A and +40°C

642,000 h

648,000 h

696,000 h

At 24 V, 10 A and +25°C

MTBF MIL HDBK 217F

216,000 h

216,000 h

240,000 h

At 24 V, 10 A and +40°C;
Ground Benign GB40

300,000 h

300,000 h

339,000 h

At 24 V, 10 A and +25°C;
Ground Benign GB25