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I have a LC resonant circuit as the above shows. And I want to switch the inductor between L1 and L2 with relays (sometimes L1 is used and sometimes L2 is used). The high voltage point between the inductor and capacitor has a voltage about 400Vp-p, and the current in the inductor is about 10Ap-p. Could I think a relay with max. switching voltage no less than 200VDC and max. switching current no less than 5A is needed? Or how should I select a relay for this application?

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I'd stick with solid state - add another couple of MOSFETs to your bridge and select one of the left pairs for driving the appropriate inductor: -

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  • \$\begingroup\$ This is a good idea. By the way, you mean a solid state relay is used to switch the control voltage between the Gates of different MOSFETs pairs? \$\endgroup\$
    – Wanghz
    Jul 13, 2018 at 9:44
  • \$\begingroup\$ No, "solid-state" just means avoidance of mechanical parts that normal relays have. Just normal logic routing to option A inputs or option B inputs with "solid-state (i.e. silicon ICs)" will do the trick. "solid state" doesn't mean "solid-state relay". \$\endgroup\$
    – Andy aka
    Jul 13, 2018 at 9:47

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