You specify open center. Does this mean the motor needs to free-wheel when not powered?
If not, you can do this with a pair of automotive relays. These are readily available from automotive parts stores and are single pole, double throw, and usually rated for 30A. The circuit: Connect the common of each relay to one of the motor leads. Connect NC of each relay to ground. Connect NO of each relay to +12V. This circuit will brake when turned off, by shorting the motor leads. Automotive relays are break-before-make, which is important in this circuit as the opposite variety would cause a dead short on your power supply. > On Aug 11, 2020, at 8:23 AM, grumpy--- via Emc-users > <emc-users@lists.sourceforge.net> wrote: > > i have a small 12v dc gearmotor rated at 50 watts > the motor will be run at full voltage forward and reverse > i need a switch for this that is electrically controllable > something like a double pole double throw relay and a seperate double pole > single throw relay > or a double pole three position with an open center > any suggestions > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
