The utility model discloses a single -phase communication module has enough to meet need case, including top open -ended box, being provided with the multiunit on the bottom plate internal surface ofbox and being used for carrying out spacing subassembly to single -phase communication module, the multiunit spacing subassembly evenly distributed be in on the bottom plate internal surface of box sothat each single -phase communication module evenly distributed be in in the box, it prevents inclined to one side subassembly all to be provided with on the bottom plate internal surface that everyclass limit hyte piece corresponds for match in order to prevent that single -phase communication module mistake from placing with single -phase communication module terminal surface's terminal. The utility model discloses a single -phase communication module has enough to meet need case has simple structure, guarantee that single -phase communication module puts steady advantage such as orderly.