The utility model discloses a join in marriage net three -phase load manual -automatic phasing switch case belongs to the electric control technology field, circuit breaker, current transformer, auxiliary relay, fuse, auxiliary relay, ac contactor, manual adjusting device and remote control adjusting device including the internal installation of cabinet set up the window on the cabinet face, installation digital display in the window, circuit breaker inlet wire side is connected with the power, the circuit breaker is qualified for the next round of competitions, and the side is connected withthe three auxiliary relay who corresponds through three current transformer, and three ac contactor's leading -out terminal and zero phase are connected with the three -phase load, and three auxiliaryrelay's coil contacts still that corresponding normally open contact with three AC relay is connected, digital display is connected with three current transformer respectively, fuse and zero phase are connected, and the three -phase load is connected through three AC relay and manual adjusting device and remote control adjusting device respectively. Can conveniently carry out the operation management to the unbalance condition of three -phase.