3RH1921-1FA40 Description Description 3RH1921-1FA40 SIEMENS Auxiliary switch block Front Mounting Auxiliary Switch Block, 4NO, S6 to S12 Related products SIEMENS 1790L811A SIEMENS 1FK6032-6AK71-1TG0 SIEMENS 1FT5072-0AC01-1-Z SIEMENS 1FK7042-5AF71-1EA0 SIEMENS 1FK6060-6AF71-1TG0 SIEMENS 1FK6042-6AF71-1TH0