These are the cells that does not require secondary protection, of which rated current is up to 1250 A and of which short circuit strength is up to 25 kA, and which do not allow switching under load.

3 polar and 3 position (open-closed-grounding rod) SF6 gas insulated separators are used in these cells as a standard and optionally air insulated revolving separators might be used.

Separator input cells are used at energy inputs of OG distribution busbars that do not require protection.