FKRN12-12D High Voltage Pressure-Air Type Load Break Switch-Fuse Combination Appliances, suitable for 3-phase power distribution systems of 12KV and below, used for the control and protection of power equipment such as transformers, cables, and overhead lines; particularly suitable for urban networks. Terminal substations and container-type substations for rural networks, as well as for the control and protection of ring networks and double radiation power supply units.