Junction boxes prepared for modular switches (18 mm modules) are supplied without switch but with DIN rail already installed. Rated load capacity up to 160 A. Junction boxes without disconnection device, internal wiring only possible with box not installed on the conduit. To choose the size of the MCB modular circuit breakers, please check the relevant data sheets and carry out the necessary derating calculations, taking into account an overtemperature inside the enclosure of approx. 30°K relative to the ambient temperature and that there is no ventilation inside the enclosure.