What It Is and Where It Fits
The Siemens 3RT2025-1AN24 is a SIRIUS power contactor in the S0 frame size, designed for switching motor loads in industrial control panels. It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, making it a direct fit for standard European-style enclosures. The coil is 24 VDC with screw-type terminals, and the main contacts accept solid or stranded conductors from 1 to 10 mm². The contactor is rated for AC-3 switching at up to 1,000 operating cycles per hour, which covers most motor starting duty cycles for pumps, fans, and conveyors.
Key Ratings and What They Mean for the Buyer
The contactor is rated for AC-3 duty at 1,000 operations per hour, meaning it can handle the inrush and breaking of typical squirrel-cage induction motors at that frequency without excessive contact wear. The AC-4 rating drops to 300 ops/h, reflecting the more severe inching or plugging duty cycles. Switching capacity varies with voltage: at 24 V rated value it handles 6 A, at 400 V rated value it handles 3 A, and at 440 V rated value it handles 0.6 A. These are the maximum currents the main contacts can make and break under the respective voltage conditions. The contactor operates between -25 and +60 °C during operation and can be stored from -55 to +80 °C. The mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward, giving flexibility in tight panel layouts.