Housing with door for the construction of installation distributors up to 250 A for operation by laypersons in accordance with IEC 61439-3. Open housing walls for combination or as individual housing with cover plates. Made of high-quality polycarbonate, protectively insulated. Fast housing connection using plug connectors and integrated seals. Large wall bushings for the electrical connection of the housings to one another. Cable entry via flanges. Wall mounting directly on the housing, via external brackets or with mounting rails. Circuit breaker housing with 9 division units for the installation of modular devices in accordance with DIN 43880. With PE and N terminals for copper conductors. N can be separated for different potentials. With cover strips for closing unused device cutouts and labeling strips for circuit identification. Transparent door and sealable door lock with manual operation.