Internal arc withstand for SM6 24kV is in conformity with IEC 62271-200; the following variants (options) are available for SM6-24:
- 12.5 kA 1 s, IAC: A-FL
- 12.5 kA 1 s, IAC: A-FLR
- 16 kA 1 s, IAC: A-FL & IAC: A-FLR
- 20 kA 1 s, IAC: A-FL & IAC: A-FR