The Siemens 3RT1034-1AN24 is a SIRIUS S2 power contactor rated for 15 kW at AC-2 duty on 400 V, and 18.5 kW at 500 V — sized for motor switching in pump, fan, and conveyor applications where moderate inrush and frequent starts are the norm. Screw-type terminals on the main circuit accept solid or stranded conductors up to 25 mm², and the contactor snaps onto a 35 mm DIN rail per EN 50022. The front face carries IP20 protection; the terminals are IP00, so panel builders typically gate the live side behind a door or cover.
Duty-cycle and mechanical endurance
Mechanical life is rated at 10 million operations typical, with maximum switching rates of 1200 cycles per hour in AC-1 (resistive loads), 1000 cycles per hour in AC-3 (standard squirrel-cage motors), and 250 cycles per hour in AC-4 (plugging/inching duty). The AC-2 rating at 400 V (15 kW) covers wound-rotor motors and slip-ring applications where the contactor must handle both starting and running current. For a maintenance-spares buyer, the 10-million-cycle baseline means this contactor will likely outlast the motor it serves in a normal production line — one in the cabinet as a critical spare covers the failure that stops the shift.
Coil and auxiliary ratings
The coil operates on 50/60 Hz with a voltage tolerance of 0.8–1.1 at 50 Hz and 0.85–1.1 at 60 Hz. Auxiliary contact ratings: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V — sufficient for direct PLC input feedback on most control schemes. Pick-up time is 7–20 ms AC; arcing time runs 10–15 ms. For a controls integrator wiring a safety circuit, the 24 V 10 A rating gives headroom for multiple feedback loops through a single auxiliary block.
Environmental and mounting
Operating temperature range is -25 to +60 °C; storage range -55 to +80 °C. Pollution degree 3 (conductive pollution or dry non-conductive pollution that becomes conductive due to condensation — typical in industrial control panels without climate control). Side-by-side mounting is permitted without derating, so multiple contactors can pack tightly on a DIN rail for multi-motor groups. The S2 frame size (55 mm wide, 112 mm tall, 164 mm deep) is a standard footprint that fits existing SIRIUS panel layouts without re-drilling.