The Siemens 3RT1026-1AG24 is a SIRIUS power contactor in the Size S0 frame, rated for motor switching at 11 kW in AC-2 duty at 400 V and 15.5 A in AC-4 duty at 400 V. The AC-2 rating (11 kW at 400 V) covers wound-rotor motor starting and reversing — the duty cycle that demands the contactor handle both starting and plugging currents without accelerated wear. For heavy jogging or inching, the AC-4 rating (15.5 A at 400 V) gives the current limit for frequent plugging and reversing. The 10 million mechanical cycles typical backs the reliability expectation for a line-side spare that sits in the cabinet for years before it sees a fault.
Coordination and wiring constraints
The main circuit terminals accept screw-type connections: solid or stranded wire from 2x (0.5 to 1.5 mm²) up to max 2x (0.75 to 4 mm²), with the larger AWG range at 2x (16 to 12), 2x (14 to 10), or single 8 AWG. That covers most panel wiring from control to motor feeder.