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I am trying to implement the following schematic: enter image description here

The two +30V sources are controlled simultaneously with the SSR LEDs. So if the top 30V source is switched on, the top SSR turns to ON state, and when the top supply is switched off the top SSR turns to OFF state. Same with the bottom 30V source and SSR. My question is can these SSR devices be turned on simultaneously and separately to the same load? So if the other SSR is in ON state, will the OFF state SSR be isolated from the load and be seen as an "open circuit"? Also, are the source pins 6 and 7 left floating like in the "A connection" example schematic in the datasheet?

The SSR device: TLP3547(TP1,F

Datasheet: https://toshiba.semicon-storage.com/info/TLP3547_datasheet_en_20200325.pdf?did=36853&prodName=TLP3547

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If the two 30 volt sources are in fact a common 30 volt source used by both SSRs then you can switch them together and there will be no problem as far as I can see. However, if the two 30 volt sources are not identical then no, you should not operate both SSRs simultaneously because there would likely be a massive current crossing from one power supply to the other.

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  • \$\begingroup\$ So if one 30V source and SSR were open and the other 30V source is shut and its SSR in OFF state, current would leak through the OFF state SSR? \$\endgroup\$ Commented May 5 at 10:15
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    \$\begingroup\$ Current will naturally leak through any SSR in its off-state. Usually a few microamps. This however, is not what my answer addresses @Nick || That current would leak into the load. I'm not sure I'm addressing your concern so, try and be clearer. Also note that when you say "shut" it's unclear what you mean. My answer is about what happens when both SSRs are on and the two 30 volt sources are slightly (or a lot) different in voltage. \$\endgroup\$ Commented May 5 at 10:29

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