Circuit to switch negative to negative, or positive to positive connection
I am wondering if there is a negative to negative (and/or positive to positive) switch.








simulate this circuit &ndash; Schematic created using CircuitLab

Figure 1. A double-pole, single-throw (DPST) switch can be used to connect negative to negative and positive to positive.


  I know mechanical relays work, but I need an electrical way of doing it. Is there a transistor that functions as such? or any other semiconductors?


Perhaps you mean that you are looking for an electronic solution rather than an electro-mechanical solution. The answer is yes but we don't have enough information in your question.