Low pressure commutation device

The utility model discloses a low pressure commutation device, including the casing to and set up in housing face's three -phase data display screen, manual phase change switch, current looks display screen, input/output binding post and the mode select switch of connecting, still be equipped with input looks data detection mechanism, comparator, main control unit and switching mechanism in the casing, input looks data detection mechanism detects the three -phase data respectively, and three -phase data display screen is connected to its output to connect the main control unit through the comparator, output terminal is connected through switching mechanism to input terminal among the input/output binding post, main control unit and manual phase change switch are connected respectively through mode select switch to switching mechanism's controller, the current looks display screen of connecting is still connected to the main control unit output. The utility model discloses with the simultaneous display of thre