The Siemens 3RT2025-1AU00 is a SIRIUS S0 power contactor — the S0 frame is the workhorse size for light-to-medium motor and resistive loads in control panels.
The headline motor rating is 14 A at 480 V and 3 hp at 230 V. For resistive or heating loads (AC-1), the contactor will handle more current, but the AC-3 number is what you size against for a pump, fan, or conveyor. The auxiliary contact is rated 10 A at 24 V, 2 A at 48/60 V, and derates further up to 0.3 A at 220 V — enough for a PLC input or a pilot light, but not for switching another contactor coil directly at higher voltages without checking the inrush.
That side clearance is tighter than the vertical, so when you're packing multiple contactors side-by-side on the DIN rail, the 6 mm gap is the limiting factor. Wire range accepts 1 to 10 mm² solid or stranded, and the terminal can take two conductors per clamp: 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²).
Operating conditions and lifecycle
The mechanical life of the contactor is typical 10 million operations. Electrical life depends on the load: 1,000 operations per hour at AC-1, AC-2, AC-3, and AC-3e, dropping to 300 per hour at AC-4 — the heavy-duty plugging and inching duty. This is a standard catalog part, not a phase-out or last-time-buy item.