The Siemens SIRIUS 3RT2026-1FB40-1KS0 is a Size S0 power contactor rated for 35 A at 24 V DC and 4.4 kW motor load at 400 V AC. The 24 V DC coil pulls in reliably down to 0.9× rated voltage and drops out cleanly; the screw-type coil terminals accept up to 2.5 mm² stranded. An integrated auxiliary switch is included, saving a separate block on the DIN rail.
Duty-cycle limits and mounting
Switching frequency caps at 1 000 operations per hour for AC-1 resistive loads, 750/h for AC-2 and AC-3 motor duty, and 250/h for AC-4 plugging/reversing. The S0 frame mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715. Mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward — useful when panel layout forces an unconventional angle.