Isolator Switch

As they have two separate tag labels it looks like they are two separate items.

Those are two separate items. Actually there isn't that much info on the diagram so it's kind of useless unless you have the other diagrams!

The answer is: you cannot know with that amount of information. You may get two different electrical elements, with different designators, in the same assembly.

For more helpful responses a mechanical drawing will certainly be required.

I gave GA because all the other answers are speculation. To be sure one can (1) look at the machine (2) Get a parts breakdown (3) call mfg and ask.

Often when you try to order what looks like one part, they tell you it is only available as an assemble, or you try to order the assembly and they tell you it is only available as separate parts. Sometimes you order the assemble and get a box of separate parts. -- JHF

I have seen this represent a single fused disconnect and two separate items. I am guilty of this as I use cut and paste for new drawing sets and leave things as is. I use the BOM, and panel backplane layout to define if these devices are a singular item or two items. So far, in 25 years, no customer has complained. Find the bill of materials, or a component layout for your answer.

This particular drawing is fraught with danger. "Usually" if there is any mechanical linkage between two devices, there would be a dashed line between them indicating the operation one causes the simultaneous operation of the other. The other scenario would be that the naming convention would somehow indicate that the two are interlinked.

In this drawing it would appear that the two actions are independent of each other. If so, then the opening of QM1 would result in the voltage sensing lights going dark, erroneously indicating that the circuit was dead, regardless of the position of Q0...

Copy somebody else's work, without thoroughly understanding it, at your own risk.