VCB ISM 12-24kV Specifications
TECHNICAL DATA
| Type of ISM | ISM15_LD | ISM15_Shell | ISM15_HD | ISM25_LD | ISM25_Shell |
| Rated voltage (Ur) | ≤ 17.5 kV | ≤ 17.5 kV | ≤ 17.5 kV | ≤ 24 kV | ≤ 24 kV |
| Rated normal current (Ir) | ≤ 1000 A | ≤ 2000 A | ≤ 3150 A | ≤ 800 A | ≤ 2000 A |
| Rated power frequency withstand voltage (Ud) | 42 kV | 42 kV | 42 kV | 50 kV | 50 kV |
| Rated lightning impulse withstand voltage (Up) | 95 kV | 95 kV | 95 kV | 125 kV | 125 kV |
| Rated short-circuit breaking current (Isc) | ≤ 25 kA | ≤ 31.5 kA | ≤ 31.5 kA | ≤ 20 kA | ≤ 25 kA |
| Rated short-time withstand current (Ik) | ≤ 65 kA | ≤ 82 kA | ≤ 82 kA | ≤ 52 kA | ≤ 64 kA |
| Rated short-time withstand current (Ik) | ≤ 25 kA | ≤ 31.5 kA | ≤ 31.5 kA | ≤ 20 kA | ≤ 25 kA |
| Rated duration of short circuit (tk) | 4 s | ||||
| Rated frequency (fr) | 50/60 Hz | ||||
| Mechanical life (CO) | 30,000 | 30,000 | 30,000 | 30,000 | 30,000 |
| Rated breaking current operating sequence | O-0.3s-CO-15s-CO | ||||