Accessory for 3KC4, 3KC8 Auxiliary switch contains 2 change-over contacts: 1 change-over contact for POS I, II for 250-630 A leading contains 1 unit incl. set of screws Comprehensive accessories for increased flexibility. From bridging bars through auxiliary switches to various drives, fourth poles or contact covers: With a wide range of accessories, the switch disconnectors and transfer switching equipment can be used for a wide variety of requirements and retrofitted at any time. www.siemens.com/switching-devices. Siemens offers a comprehensive portfolio of protection, switching, measuring and monitoring devices, distribution systems as well as switches and sockets for safe and efficient electrical infrastructure in buildings and industry.