Low pressure blend switch

The utility model discloses a low pressure blend switch, which comprises a housin, the inner chamber of casing is equipped with the baffle, the baffle is separated the inner chamber of casing for sealing chamber and open room, the inner chamber of sealing chamber is equipped with controller and magnetic latching relay, magnetic latching relay is connected to the controller electricity, the inner chamber of open room is equipped with the pulse trigger module, the surface of pulse trigger module is equipped with the silicon controlled module, and the pulse trigger module is connected to the controller electricity, the silicon controlled module is connected to pulse trigger module electricity, the port bottom of open room articulates there is the shutter, the surperficial border of the room open relatively of shutter is equipped with the lug, the edge ports of lug room open relatively is equipped with the recess with lug matched with, the port top of open room still is equipped with the hasp, the surface of casing is equipped with external end and status indicator lamp respectively, and external end and the equal electric connection director of status indicator lamp. This low pressure blend switch, simple structure, the leakproofness is good, is convenient for maintain.