Low-voltage switchgears; fuse-switch-units; DO-system <E(>VDE Specification<E)>

This technical specification addresses the design, construction, and performance requirements for low-voltage switching devices and switch-fuse combinations utilized within the DO system architecture. It establishes fundamental criteria to ensure operational safety and reliability in electrical installations operating at nominal voltages up to 1,000 volts AC or 1,500 volts DC. The document outlines specific dimensions, material properties, and electrical characteristics necessary for components that function as both switches and protective fusing elements within distributed systems. It provides detailed guidelines on isolation capabilities, making and breaking capacities, and thermal limits under defined operating conditions. The text covers testing procedures to verify durability and safety margins during continuous use and fault scenarios. It serves as a reference for manufacturers designing components and for installers ensuring proper equipment selection and integration into existing low-voltage networks. The content includes definitions of relevant terms, technical parameters for different rating classes, and instructions for marking and labeling to guarantee clear identification. Adherence to these technical criteria helps maintain consistency across production lines and facilitates the interoperability of components from various suppliers within the specified system environment.