Delta i-system, titanium-white cover plate with locking slider for mounting plates modular jack connectors Delta m-system - design and quality in perfection from Siemens. The m-system offers various module inserts for signalling and communication purposes. The Siemens m-system offers the following advantages: 1. the modular design means that the inserts can be used with Delta line, Delta miro, Delta profil and Delta style. 2. one module carrier can be equipped with up to two different functions. Siemens offers a comprehensive portfolio of protection, switching, measuring and monitoring devices, distribution systems as well as switches and sockets for safe, efficient electrical infrastructure in buildings and industry.