The Siemens 3RT2325-1BG40 is a SIRIUS contactor in the S0 frame size, built for switching motor loads and resistive circuits in control panels. It carries a 24 VDC screw-type coil and is designed for screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715. The auxiliary contact block delivers 10 A at 24 VDC, with a full DC-13 switching curve covering 2 A at 48 V, 6 A at 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, and 10 A at 230 V — so the same auxiliary set handles 24 V PLC signals and 230 V indicator loads without a separate relay.
Panel fit and mounting
The 60 mm wide, 85 mm tall, 107 mm deep footprint fits standard S0 contactor spacing. Snap-on onto 35 mm DIN rail per DIN EN 60715; the screw terminal option is also available for direct panel mounting. Mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward or backward, so it adapts to tight gland-plate layouts. Side clearance of 6 mm to adjacent devices; 10 mm clearance upward, downward, and forward. Stranded main-circuit wiring accepts 1 to 10 mm²; auxiliary terminals take 2x (0.5 to 1.5 mm²) solid or 2x (0.75 to 2.5 mm²) stranded.
Environmental and lifecycle
Rated for operation from -25 to +60 °C; storage range is -55 to +80 °C. The lifecycle stage is listed as current production — this is an active catalog line, not a phase-out or NRND part. The mechanical endurance is 10 million operations typical. The arcing time on the main contacts is 10 to 10 ms, and the DC coil dropout timing is 15 to 18 ms.
DC auxiliary contact ratings — what they mean for your circuit
The auxiliary switch is rated for DC switching across the voltage range, not just a single point. At 24 V it handles 10 A — enough for a bank of solenoid valves or indicator lamps. At 48 V the rating drops to 2 A, and at 125 V to 0.9 A. The 230 V rating is 10 A, but that is an AC value. For DC loads above 60 V, derate to the listed DC curve: 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, 0.1 A at 600 V, and 1 A at 690 V. The full-scale value of 1.1 and initial value of 0.8 likely refer to the coil pickup and dropout multipliers — the coil holds at 80% of rated voltage and picks up at 110%.