Fire protection switch block AFDD, 1-40A 230V for miniature circuit breakers and residual current devices 1+N 2TE Fire protection switch block SENTRON 5SM6 for reliable and comprehensive protection of people, systems and assets in the event of arc faults. Fire protection switches detect dangerous arc faults early on and switch off safely before a fire starts. With their innovative technology, they reliably cover the previous protection gap of conventional devices. The block design enables combination with many miniature circuit breakers or residual current devices and thus reduces storage. The fire protection switch blocks are available in versions up to 16 A or up to 40 A for 1- and 2-pole attachments. The fire protection switch blocks can only be operated in conjunction with a miniature circuit breaker or residual current device. Optimum technology for your safety - only from Siemens.