Equipment Failure Rates: Relay
Equipment failure rates, MTBF, MTTR, and downtime statistics for electrical and mechanical plant equipment. Primary data from the USACE PREP reliability database (IEEE Std 3006.8-2018 Table 2), covering ~280 equipment classes. Supplemental data from IEEE motor and transformer surveys.
| equipment type | class code | description | failure rate per year (failures/year) | failures (count) | mdt hours (h) | mtbf hours (h) | mttm hours (h) | mttr hours (h) | standard | survey | unit years (unit-years) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Relay | E33-110 | Relay, electromechanical, | 0.002415 | 2 | 4.51 | 3,627,240 | 4.28 | 35.5 | IEEE Std 3006.8-2018 Table 2 | USACE_PREP | 828.1 |
| Relay | E33-120A | Relay, electromechanical, | 0.000877 | 0 | — | 13,576,000 | — | — | IEEE Std 3006.8-2018 Table 2 | USACE_PREP | 790.4 |
| Relay | E33-130 | Relay, electromechanical, | 0.000813 | 3 | 3.36 | 10,771,400 | 3.35 | 8 | IEEE Std 3006.8-2018 Table 2 | USACE_PREP | 3,688.8 |
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