Standard junction boxes are supplied with fuse holder base already installed and wired (fuses excluded). Available from 32A up to 160A. Junction boxes without disconnection device, internal wiring only possible with box not installed on the conduit. To choose the fuse size, check the data sheets of the fuses you want to use and carry out the necessary derating calculations, taking into account an overtemperature inside the fuse box of approx. 30°K relative to the ambient temperature and that there is no ventilation inside the box.