Siemens 3RT2025-1AN10 SIRIUS Power Contactor — Size S0, 480 V 14 A
The Siemens 3RT2025-1AN10 is a SIRIUS power contactor in the Size S0 frame, designed for switching motor loads and resistive circuits in industrial control panels. It carries a 14 A rating at 480 V in AC-3 duty (motor switching) and 3 hp at 230 V, making it a fit for small to mid-range three-phase motors on 480 V or 230 V lines. The screw-type terminals on the magnet coil and main contacts accept solid or stranded wire from 1 to 10 mm², which covers most panel wiring up to about 6 AWG. Mounting is via screw or snap-on onto a 35 mm DIN rail per DIN EN 60715, and the contactor can be rotated ±180° on a vertical surface or tilted ±22.5° forward/backward — useful when fitting into tight enclosures or existing layouts. The S0 frame width is 45 mm, so it occupies a single DIN-rail module position.
Ratings and What They Mean for Your Panel
The AC-3 rating of 14 A at 480 V is the number that governs motor switching — it tells you the contactor can make and break a three-phase induction motor at full load current under those conditions. The 3 hp at 230 V rating gives a direct match for common 230 V single-phase or three-phase motor sizes. For resistive loads (AC-1), the mechanical life supports up to 1,000 switching cycles per hour, and the contactor's typical mechanical life is 10 million operations — that's a long service interval for a conveyor or pump starter. For DC switching, the contactor has a rated operating current curve: 10 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, and 3 A at 400 V. These are the values for breaking DC inductive loads — the arcing time is 10 ms, and the switching frequency for AC-4 duty (plugging/inching) is limited to 300 cycles per hour. The ambient operating range is -25 to +60 °C, with storage from -55 to +80 °C.
Panel Integration and Wiring
Dimensions: 85 mm high, 45 mm wide, 97 mm deep. Depth fits standard enclosures with wiring clearance. Auxiliary switch present; wire range 1 to 10 mm² solid or stranded. Clearance distances: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side. These are the minimum air gaps to maintain for arc flash and heat dissipation — important when packing multiple contactors on a DIN rail.