What this SIRIUS contactor is and what it does
The Siemens 3RT2326-1BG40 is a SIRIUS contactor in the S0 frame size, designed for switching loads in industrial control panels. It carries a DC coil rated at 125 V with screw-type terminals, and the main contacts are rated for switching currents up to 10 A at 24 V, 10 A at 230 V, and 1 A at 690 V, among other voltage-specific ratings. The contactor snaps onto a 35 mm DIN rail per DIN EN 60715 or can be screw-mounted, and its compact footprint (85 mm high, 60 mm wide, 107 mm deep) fits tight enclosure layouts.
Switching ratings and what they mean for your load
The contactor's switching current varies significantly with the load voltage and type. At 24 V DC it handles 10 A, at 48 V it drops to 2 A, and at 125 V it handles 0.9 A. For AC loads at 230 V it switches 10 A, at 400 V it handles 3 A, and at 690 V it manages 1 A. These ratings reflect the contactor's ability to interrupt the load arc at different voltages — pick the rating that matches your actual operating voltage, not the coil voltage. The auxiliary switch is included, with its own current ratings across the same voltage range.
Mounting and wiring details
Mount the contactor on a 35 mm DIN rail (screw or snap-on) per DIN EN 60715. The mounting position allows ±180° rotation on a vertical surface, and can be tilted forward/backward by ±22.5°. For main contacts, accept stranded wire from 1 to 10 mm²; auxiliary contacts accept solid or stranded wire in two sizes: 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²). Keep the side clearance at 6 mm and vertical clearance at 10 mm for proper heat dissipation and arc quenching.