Siemens 3SB3931-1AA Description Description Siemens ACCESSORY / SPARE PART ROUND, 22MM: BUTTON(SEAL) FLAT FOR ILLUMIN. PUSHBUTTON AND-SWITCH Related products SIEMENS 1FN1910-0AA20-1AA0 SIEMENS 1FT5066-1AF71-4AA0 SIEMENS 1FK6032-6AK71-1TA0 SIEMENS 1790L811A SIEMENS 1FT5072-0AC01-0-Z SIEMENS 1FK6042-6AF71-1TH0