The Siemens 3RT1024-1AQ24 is a SIRIUS S0-frame power contactor rated for AC-3 motor switching at 7.5 kW at both 500 V and 690 V, making it a direct fit for 400 V-class three-phase motors in the 7.5 kW range and for 690 V line applications common in mining, pumping, and conveyor systems. The 45 mm width and 85 mm height fit the standard S0 footprint; screw and snap-on mounting onto 35 mm DIN rail per DIN EN 50022 means it drops into any panel already tooled for SIRIUS contactors without drilling or adapter plates.
AC-4 reversing and high-inrush duty
For reversing or plugging duty (AC-4), the contactor is rated at 12.5 A at 400 V — a useful figure when sizing for frequent reversals on a conveyor or hoist where the motor sees repeated inrush. The AC-3 rating at 400 V is 5.5 kW, which is the standard motor-switching figure for a 7.5 kW motor at 400 V (since AC-3 derates from the 690 V rating). The AC-12 rating (control-circuit switching) is 10 A at 24 V, covering most PLC output or relay pilot-duty loads.
Type 2 coordination (contactor remains operational after clearing a fault) needs a 25 A gL/gG fuse. This distinction matters when the panel spec calls for Type 2 — the 25 A fuse is the tighter limit. The screw-type main terminals accept up to 2x 10 mm² stranded or 1x AWG 8, with solid wire options down to 0.5 mm². The auxiliary contacts (2 instantaneous) use the same screw terminal range.