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 each other. Cable entry via flanges. Wall mounting directly on the housing, via external brackets or with mounting rails. Housing with circuit breaker 250 A, 3-pole, in accordance with IEC 60947-2. With PE and N terminals. With overload and short-circuit release. Connection compartment can be changed. With transparent door and door lock with tool operation.