Are Make-Before-Break relays still a thing?

I have a 12v DC system I would like to switch between power supplies in such a way that the device being powered does not lose power. Sorry, NOT BETWEEN POWER SUPPPLIES, I drew a diagram and added it to the question. The idea is that the relay would enable/disable the regulator without the devices powered by the inverter noticing. It needs to handle 100-300Watts or so.


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    \$\begingroup\$ That would short two power supplies together. Not a good idea, with power supplies capable of 8 to 25 amps. \$\endgroup\$
    – Justme
    Apr 4, 2022 at 18:24

1 Answer 1


Can the power supplies tolerate being shorted together?

This can be done by using diodes from each supply without any risk of shorting.

  • \$\begingroup\$ I added a diagram and reworded the question to be more precise. \$\endgroup\$
    – FN-Support
    Apr 4, 2022 at 20:32

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