2 Phase zero time switch
I'm trying to build an instant or zero 2 phase switch (DC current).


For switches we use the word "pole" for each circuit. You are looking for a two-pole changeover switch.

No switch is instant. You'll have to specify an acceptable transfer time.

A relay might suffice but your specification is too vague at present.







simulate this circuit &ndash; Schematic created using CircuitLab

Figure 1. A relay can provide polarity reversal.

You can add some capacitance on whichever side is guaranteed to maintain its polarity. This will ride out the brief interruption during switching.