Siemens 3RT2015-1HB42 SIRIUS 3RT contactors, 3-pole, up to 250 kW. Siemens 3RT2015-1HB42 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, 7 A, 3 kW / 400 V, 3-pole, 24 V DC, 0.7-1.25* Uc, auxiliary contacts: 1 NC, screw terminal, frame size: S00, suitable for PLC outputs, no auxiliary switch can be added.