What it is and where it fits
The Siemens SIRIUS 3RT2025-1AP00-ZW96 is a power contactor in frame size S0, 45 mm wide, designed for switching motor loads and resistive loads in control panels. It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715. The contactor carries a built-in auxiliary switch and uses screw-type terminals for the magnet coil and main contacts, accepting solid or stranded conductors from 1 to 10 mm².
Key ratings and what they mean for your BOM
For motor duty, the contactor is rated at 3 hp at 230 V and 14 A at 480 V — these are the AC-3 switching figures that govern real motor starts. The auxiliary contact ratings drop as voltage rises: 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. Switching frequency is rated at 1 000 operating cycles per hour for AC-1, AC-2, AC-3, and AC-3e duty, dropping to 300 cycles per hour for AC-4 (plugging/reversing). Mechanical service life is 10 000 000 operations typical. Operating temperature range is -25 to +60 °C, with storage from -55 to +80 °C. Mounting position allows +/-180° rotation on a vertical surface and +/-22.5° tilt forward/backward.
Integration and clearances
Dimensions are 85 mm high, 45 mm wide, 97 mm deep. Required clearances: 10 mm upwards, 10 mm downwards, 10 mm forwards, and 6 mm at the sides. The contactor occupies a single 45 mm slot on the DIN rail — standard for S0 frame size. Screw terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) for auxiliary wiring.