Delta m-system light signal single unit green light color 1W 90-240V. Delta m-system - design and quality in perfection from Siemens. Our m-system offers various module inserts for signaling and communication purposes. The Siemens m-system provides the following advantages: 1. Due to its modular design, the inserts can be used with Delta line, Delta miro, Delta profil, and Delta style. 2. A 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 a safe and efficient electrical infrastructure in buildings and industry.