Incomer disconnection/isolation devices can be set only for distribution circuits. To set the incomer disconnection/isolation device, select the protective devices tab (1) and then the incomer disconnection/isolation sub-tab (2). The engineer can choose to use an overcurrent protection device and/or an RCD device and/or and isolation/disconnection device. For this example we will use the default isolation/disconnection device AC21 at 63A (3), as shown below.