Accessories for 3KD BG1/2, 3KF BG1 3KC0 construction group 1/2, auxiliary switch 1 changeover with connection cable 500 mm. Comprehensive accessories for increased flexibility. From connection bridges to auxiliary switches and various drives, fourth poles, or contact covers: With a wide range of accessories, the load disconnectors and network switches can be used for different requirements and retrofitted at any time. Siemens offers a complete 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.