Hager is a well-known manufacturer of electrical distribution systems, including the Hager 123 series of energy meters, controllers, and building automation devices. The “schema” typically refers to wiring diagrams, communication protocols (e.g., Modbus mapping), or technical configuration files for these devices. Such documents are proprietary, protected by copyright, and distributed only through official Hager channels (e.g., after purchase, registered access, or authorized technical support).
– it’s freely accessible but official. This should be your first stop. hager 123 schema free download exclusive
If you are looking for specific wiring diagrams rather than the software itself: communication protocols (e.g.