Siemens sirius 3rt19 contactor and 3rh19 din rail control relay siemens 3rt1926 1bd00 the siemens sirius surge suppressor varistor 3rt1926 1bd00 is supplied without led the s00 size varistor is for plugging onto the front side of the contactor with or without an auxiliary switch block the varistor has a dual voltage of 127 to 240v ac and 150 to 250v dc siemens 3rt1926 1bd00 varistor s0 s2 s3 127 240 vac 150 250 vdc