A power supply system for an arc furnace includes a three phase transformer assembly, back to back SCRs coupled between a power source and the three phase transformer assembly primary windings, and three saturable-reactors, coupled between the three phase transformer assembly secondary windings and a load. The storage system advertises storage services to the device over the home network. a motor vehicle heat exchanger, has a first part formed from a shaped metal sheet and featuring a bottom and two lateral walls folded face-to-face, at least one of which is provided with an aperture for fixing a pipe there. An inspection unit receives the identification number of the memory region designated, determines whether the validation information about the identification number of the memory region designated is valid, and requests the data storage to output the data stored in the memory region designated when the validation information is valid. The method includes locating an ion exchange spacer in at least one chamber of the membrane cell assembly wherein an ion exchange spacer comprises an ion exchange resin and a dissolvable binder. The network bridge may be inserted in a network topology without requiring significant network configuration changes.