No arc extinguishing capability: the isolating switch can only be divided and combined in the absence of load current, and cannot be operated with load, that is, it cannot be operated with rated load or heavy load, nor can it be divided and combined with load current and short-circuit current. However, the arc extinguishing chamber can be operated with small load and no-load line.

Obvious disconnection point: when the contact of the isolating switch is divided into positions, there shall be an insulation distance meeting the specified requirements and an obvious disconnection mark, so as to observe whether the circuit is in a disconnected state.

Rated parameter matching: When selecting the isolating switch, its rated voltage, rated current, dynamic stability current, thermal stability current, etc. must meet the needs of the occasion.