Power supply polarity change over switch

The utility model discloses a power supply polarity change over switch, including be equipped with the shell that inserts the hole and with the positive negative pole converter that inserts hole threaded connection, be provided with forward circular telegram circuit and the reverse circuit of switching on on the positive negative pole converter, the hand of spiral setting along the positive negative pole converter on of joint on forward circular telegram circuit and the reverse circuit of switching on inserts the downthehole conducting strip that is provided with, the conducting strip forms the electrode negative with forward circular telegram line connection, forms with the reverse line connection of switching on and join conversely, the electrode negative with join conversely mutual alternative along with the rotation of positive negative pole converter. Forward circular telegram circuit can carry out the transition with reverse the circular telegram between circuit and conducting strip, and electrode negat