Siemens 3RT2036-3SB30 SIRIUS 3RT contactors, 3-pole, up to 250 kW. Siemens 3RT2036-3SB30 is the exact printed commercial reference for a contactor / contactor accessory in the SIRIUS 3RT Contactors range. Siemens' official product description is: power contactor, AC-3e/AC-3, 51 A, 22 kW / 400 V, 3-pole, 21-33 V AC/DC, 50/60 Hz, with integrated varistor, auxiliary contacts: 1 NC, main circuit: screw terminal, control and auxiliary circuit: spring-loaded terminal, size: S2, F-PLC-IN.