30 Amp Rocker Switch Polarity Reverse DC Motor Control - Lift Bridge Furniture
Polarity Switching of External Power Source - #21 by LarryD - Project Guidance - Arduino Forum
TWTADE Waterproof Latching Reverse Polarity Switch 12V 10 Amps DC Motor Control 6 Pin 3 Position ON/Off/ON Metal DPDT Toggle Switch with Waterproof Boot Cap and 21mm Terminal Wires E-TEN-1322-DMX : Amazon.co.uk:
dc motor - Circuit to reverse polarity - Electrical Engineering Stack Exchange