Originally Posted by smoothlarryhughes
Would this switch work for having on/off/on? Could you show the wiring with a contactor, and which contactor do you recommend from auber to work with a switch like this?
Could you explain the difference between the N/O and N/C contact blocks?
Sorry for the delay in responding to your requests and I sincerly apologize for that.
The N/O - N/C contact in a switch that is an ON/OFF switch behave as one would expect. However, with a 'center off' switch the N/C blocks behave in a rather different manner than one would expect. Here is an illustration:
The switch that you linked is an Auber Instruments SW3 unit. That specific switch is illustrated in the diagram (switch #1) that I drew for you that includes contactors instead of the switch in the diagram on page one. This diagram has a few function changes included as well. The timer now has 'pause' & 'reset' buttons. The PID has alarm wiring as well. I sourced everything that I could from Auber Instruments.
I hope this helps you in your plan.
As always - Click on the image to see a full scale diagram printable on Tabloid paper (11" x 17")
I hope this is of some help to you. And again, sorry for the delay.