PURPOSE: To provide an air-conditioning system device, capable of avoiding the increase of the capacity of fuses and/or remote controller to prevent the increase of cost and making the removing work of fuses for slave machines unnecessary to contrive the simplification of works.

CONSTITUTION: Respective air-conditioning machines are provided with fuses 6, 6 and relays 21, 22 and the excitation of the relays 21, 22 are effected through the contacts 21a, 22a of a remote controller 7 while the excitation of electrical equipments for respective air-conditioning machines is effected through the fuses 6, 6 and relay contacts 21a, 22a for each air-conditioning machines.