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Eaton's Cooper Power series PST pad-mounted source transfer (PST) switchgear with iST control is a compact, outdoor, self-contained system ideal for critical, medium-voltage loads. These applications include healthcare facilities, data centres, broadcast studios and production facilities that require highly dependable power for continuous, optimum operation.
| 15 kV | 25 kV | 35 kV | |
| Maximum design voltage, kV | 95 | 125 | 38 |
| BIL, kV | 95 | 125 | 150 |
| 1-minute withstand voltage (60 Hz) interrupter and terminators, kV |
35 | 40 | 50 |
| Continuous current (max), A |
600 | 600 | 600 |
| Interrupting current (sym./asym.), kA |
12/20 |
12/20 |
12/20 |
| Momentary current 10 cycles (asym.), kA |
20 | 20 | 25 |
| 1-second withstand current (sym.), kA |
12 | 12 | 12 |
| Making current (sym.), kA |
12 | 12 | 12 |
| Transformer magnetising interrupting current, A |
21 | 21 | 21 |
| Cable charging interrupting current, A |
15 | 15 | 20 |
| Capacitive, A |
10 | 25 | 40 |
| Direction of transfer transition | Type of return (cycles) | First interrupter reaction time* (cycles) | Transition time* (cycles) |
| Preferred to alternate | Non-parallel | 2.0 to 3.0 | 5.0 to 6.0 |
| Alternate to preferred | Non-parallel |
2.0 to 3.0 | 5.0 to 6.0 |
| Alternate to preferred | Parallel** | 5.0 to 6.0 | 2.0 to 3.0 |
| * Time from expiry of time delay to first opening (or closing) of high-voltage interrupter. Add about 1 cycle to values shown to allow for iST control contact time. | |||
| ** Parallel return time does not include sync check time. | |||
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