Siemens 3RT1034-1BB44 Three-Phase AC Contactor

Siemens 3RT1034-1BB44 is a three-pole AC-3 power contactor with a 24 V DC coil, rated for 32 A at 400 V (approximately 15 kW in AC-3 duty). It ships with the 3RH1921-1HA22 auxiliary contact block, delivering four signaling contacts—two normally open and two normally closed—for interlocking and control feedback. The main circuit provides three normally open contacts (3NO) and the unit uses size S2 with screw-terminal connections, featuring front IP20 protection. Mechanical service life is specified at about 10,000,000 cycles for the base contactor and about 5,000,000 cycles with the auxiliary block installed; Siemens notes this product as End of Life with a recommended successor in the SIRIUS 3RT2 family (for example 3RT2027-1BB44-3MA0).