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I have a 20A DC device that I am powering from two different 12V DC sources and one AC 120V source (the AC source will drive a PS in the case to supply 12V DC) depending on availability:

  • Internal Battery DC
  • External Battery DC
  • AC 120

So 3 power sources in, but the same feed line out to the device. I want a simple switch which doesn't need to maintain power between switchover—so completely disconnected from each source. I looked at a regular rotary switch but most don't handle 20A. Usually around an amp or two at most. Can you point me to a rotary that will work for this? I need 4 positions and 4 poles? (one position being "Off").

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  • \$\begingroup\$ why do you need a 4 pole switch? \$\endgroup\$ – jsotola Oct 1 at 15:49
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    \$\begingroup\$ You should restate the question to ask "what kind of switches can fulfill this requirement" instead of "point me to a specific rotary switch." The latter formulation, as you have it now, will be closed as a product recommendation, which is off-topic. \$\endgroup\$ – JYelton Oct 1 at 15:55
  • \$\begingroup\$ Narrow it down from here: alliedelec.com/relays/power-relays/… You can do the same on the Digikey website as well. \$\endgroup\$ – varun Oct 1 at 17:26
  • \$\begingroup\$ Jsotola—I wanted to keep all sources totally separate so my my understanding was that it would require that. But I guess I could get away with three? What do you know that I should know but don't? \$\endgroup\$ – user264202 Oct 1 at 21:49
  • \$\begingroup\$ JYelton—So product recommendations are not allowed? I am a brand newbie (today) to SE. \$\endgroup\$ – user264202 Oct 1 at 21:50

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