These are the cells that do not require secondary protection, of which current is up to 630 A and of which short circuit strength is up to 20 kA, and which couple two busbars supplied from two different sources through manual switching.

Load separator might be used on these cells, whereas optionally 3 polar, 3 position (open- closed-grounding rod) SF6 gas insulated or revolving separator up to 1250 A rated current and 25 kA short circuit current might be used.

Load separator busbar coupling cells are used for coupling two busbars.