It is used for indoor high-vol switchgears. 1.DXN-T/Q indicators for Low voltage , Medium voltage and High voltage switchgears ! 2.102*72DXN-T/Q indicators for Low voltage , Medium voltage and High voltage switchgears ! 3.6kV , 6kV , 7.2kV ,8kV , 10kV , 12kV , 20kV , 24kV , 36kV , 40.5kV . voltage indicator