| Arrester Rating (kVrms) | MCOV (Kv rms) | Front of Wave Protective Level (kV crest) | Maximum Discharge Voltage (kV Crest) 8/20 μs Current Wave | |||||
| 1.5 kA | 3 kA | 5 kA | 10 kA | 20 kA | 40 kA | |||
| 21 | 17.0 | 71.3 | 60 | 64 | 68 | 76 | 89 | 111 |