Equipment Failure Rates: Switch
E34-110 to E34-510A
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) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Switch | E34-110 | Switch, automatic transfer, ≤ | 0.026194 | 27 | 8.32 | 334,429 | 8.98 | 2.66 | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 1,030.8 |
| Switch | E34-120 | Switch, automatic transfer, ≤ | 0.039937 | 74 | 2.42 | 219,347 | 1.82 | 9.9 | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 1,852.9 |
| Switch | E34-211 | Switch, disconnect, enclosed, ≤ | 0.000717 | 6 | 2.09 | 12,224,124 | 2.09 | — | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 8,372.7 |
| Switch | E34-212 | Switch, disconnect, enclosed, | 0.000893 | 2 | 3.38 | 9,805,776 | 3.03 | 46 | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 2,238.8 |
| Switch | E34-213 | Switch, disconnect, enclosed, > | 0.007173 | 15 | 2.86 | 1,221,277 | 2.08 | 15.82 | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 2,091.2 |
| Switch | E34-221A | Switch, disconnect, fused, dc, ≤ | 0.00012 | 0 | 0.54 | 99,372,047 | 0.54 | — | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 5,785.4 |
| Switch | E34-222A | Switch, disconnect, fused, dc, > | 0.000805 | 0 | — | 14,797,365 | — | — | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 861.5 |
| Switch | E34-310 | Switch, electric, on/off breaker | 0.000642 | 2 | 0.01 | 13,644,684 | 0.01 | 1 | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 3,115.2 |
| Switch | E34-400 | Switch, float, electric | 0.034611 | 87 | 22.86 | 253,098 | 0.91 | 9.84 | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 2,513.6 |
| Switch | E34-510A | Switch, manual transfer, ≤ 600 | 0.0026 | 0 | — | 4,579,482 | — | — | IEEE Std 3006.8-2018 Table 2 | USACE PREP | 266.6 |
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