Hi Sam 

Thanks for posting in the Lucidchart Community! The best way to achieve the effect you're looking for would be by adding action to a shape to turn it into a button to toggle/hide/show your layers. I will use your example to outline the steps: 

1. First create an object to function as your toggle/hide/show button. In the example below I created an object and added the descriptive label text "Power Cut Button."


2. Make sure you have a separate layer(s) specific to the objects you want to toggle/hide/show. In the example below I created two layers: USP and Power Green Lines. 


3. Make sure the objects you want to toggle/hie/show are assigned to those layers. In the example below I assigned the shapes UPS 7 and UPS 8 to the layer "UPS" and the lines connecting the UPS shapes and the STS shapes to the layer "Power Green Lines."  


4. Select the object you worked to function as a toggle on/off button > Click on the lightning bolt icon in the formatting bar.


5. Select Layers > Select the type of action you'd like to add to your shape > Check the boxes next to the layer(s) you'd like to be toggled/hidden/shown by the button. 


6. Click Done.

Now every time I activate my "Power Cut Button" it toggles on/off the "UPS" and "Power Green Lines" layers. See what it looks like when I activate the button to toggle the layers off: 


You can use this process to create one layer for each UPS shape > assign each of those UPS shapes to their respective layers > create a button that will toggle/hide/show only one of the UPS shapes without affecting the green lines. 

Please note that in order to activate a shape with an action you must hold down Shift+Ctrl (Shift+Cmd for Mac). 

I hope this helps! For more information about how to use actions to toggle/hide/show layers please review our Add Actions to a diagram and Add Layers to a Diagram articles from the Lucidchart Help Center.