The following table contains mean time between failures information for the 5120 Series switches.
| Model | PSU Details | Fan Details | MTBF at 25°C | MTBF at 50°C |
|---|---|---|---|---|
| 5120-24X-4Y | F-B, 1x AC 550W | F-B, 4x internal fans | 1,057,852 | 344,430 |
| F-B, 2x AC 550W | F-B, 4x internal fans | 1,432,829 | 448,076 | |
| B-F, 1x AC 550W | B-F, 4x internal fans | 923,749 | 324,689 | |
| B-F, 2x AC 550W | B-F, 4x internal fans | 1,382,666 | 430,015 | |
| 5120-24XT-4Y | F-B, 1x AC 550W | F-B, 4x internal fans | 958,112 | 306,966 |
| F-B, 2x AC 550W | F-B, 4x internal fans | 1,255,764 | 386,681 | |
| B-F, 1x AC 550W | B-F, 4x internal fans | 861,174 | 300,718 | |
| B-F, 2x AC 550W | B-F, 4x internal fans | 1,246,792 | 388,954 | |
| 5120-44X-4Y-2C | F-B, 1x AC 550W | F-B, 6x internal fans | 830,919 | 267,850 |
| F-B, 2x AC 550W | F-B, 6x internal fans | 1,045,921 | 326,600 | |
| B-F, 1x AC 550W | B-F, 6x internal fans | 747,519 | 253,355 | |
| B-F, 2x AC 550W | B-F, 6x internal fans | 1,021,857 | 313,219 |