collected data to the sub interrupters 73 1 and 73 2 accommodating the automatic trip device 53 in the upper intermediate layer fig8 a and 8b show flow charts illustrating a method of communicating between a system computer or user 39 s computer and a plurality of automatic trip devices constituted as a network system at step st 1 a system computer 71 requests the interrupter connection authentication from a main interrupter 72 step st 1 moves in order to steps st 2 and st 3 that the main interrupter 72 transmits a connection approval signal and the communication connection completion signal to the system computer 71 after the completion of the communication connection the system computer 71 performs steps st 4 and st 5 of transmitting the interrupter control message to the main interrupter 72 and receiving the interrupter state message from the system computer 71 after receiving the interrupter state message from the main interrupter 72 the system computer 71 performs steps st 6 and st 7 of transmitting the communication connection terminating signal to the main interrupter 72 and then is switched into a wire and wireless communication mode by a wire and wireless communicating device 65 as described above it is noted that the system computer 71 is communicated with the main interrupter 72 accommodating the automatic trip devices mounted in the intermediate layers on the other hand the system computer 71 or user 39 s terminal can be communicated with the main interrupter 72 the receptacles 74 1 74 2 74 3 and 74 4 in the lowest layer the illuminating equipment and mechanism 75 1 the electrical appliance equipment and mechanism 75 2 that.