I am considering using a reversing contactor set to switch polarity in a 12V DC circuit to electromagnets (drawing 50 A total), and wonder whether the on/off switches controlling the 2 internal coils in such an assembly, designed to open and close magnetic switches in usual applications (for reversing AC motors etc.), might themselves be controlled using a 555 IC-type timer with a 6 to 12V power source; also meaning that the internal coils would be 6 to 12V DC coils.