What it is and where it fits
The Siemens SIRIUS 3RT2025-2AP00-1AA0 is a 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, standing on a horizontal mounting surface — standard panel integration for this class. The coil is 24 VDC, and the main contact termination uses spring-type terminals. The auxiliary switch is integrated. Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C. The contactor is rated for up to 1,000 switching cycles per hour under AC-1, AC-2, AC-3, and AC-3e duty, and 300 cycles per hour under AC-4 duty — the AC-4 figure governs frequent plugging or inching applications.
Wire capacity and terminal details
Main contact terminals accept solid or stranded wire from 1 to 10 mm². For auxiliary contacts, the terminal accepts 2x (0.5 to 2.5 mm²) solid or stranded. The spring-type terminals on the magnet coil require no re-torquing during routine maintenance.
Auxiliary contact ratings
The integrated auxiliary switch is rated for 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, 3 A at 400 V, and 0.6 A at 440 V. At 480 V it carries 14 A. The motor horsepower rating at 230 V is 3 hp.
Dimensions and clearances
The contactor measures 45 mm wide, 102 mm high, and 97 mm deep. Required clearances around the device: 10 mm upwards, 10 mm downwards, 10 mm forwards, and 6 mm at the side.