Switch for MV or HV traction line test device

A switch for a medium voltage (MV) or high voltage (HV) traction line testing device includes a plurality of normally-opened pairs of contacts connected in series, wherein each pair of contacts is equipped with a separate control coil, wherein the switch further comprises:

• a wireless power transfer supply module being on ground potential for supplying cascaded wireless power transfer receivers comprising a transmitting coil, high frequency inverter and microcontroller,
• a plurality of cascaded wireless power transfer receivers for supplying control coil of pairs of contacts;
• wherein each of the cascaded wireless power transfer receivers is referenced to a floating potential and comprises a receiving coil,
• wherein each of the separate control coils is connected to one of the cascaded wireless power transfer receivers,
• wherein receiving coils of the cascaded wireless power transfer receivers are magnetically coupled, and
• wherein the wireless power transfer supply module is located in a middle of the cascaded wireless power transfer receivers.