The Siemens SIRIUS 3RT2025-1BP40 is a power contactor in the S0 frame size, designed for switching motor loads in industrial control panels. It carries a 230 V AC coil and uses screw-type terminals for main and auxiliary wiring. The contactor mounts on 35 mm DIN rail per DIN EN 60715, with screw and snap-on fastening, and can be rotated ±180° on a vertical surface or tilted ±22.5° forward/backward.
Sizing and fit for the panel
At 45 mm wide, 85 mm tall, and 107 mm deep, the S0 frame fits standard 45 mm DIN-rail pitch. Clearance requirements: 10 mm above and below, 10 mm forward, 6 mm to the side. Wire capacity accepts solid or stranded conductors from 1 to 10 mm² on the main contacts, and two conductors per clamp on auxiliary circuits (0.5–1.5 mm² or 0.75–2.5 mm²).
Switching performance and coil data
The coil pulls in at 80 % of rated voltage and drops out at 110 % of rated voltage. Arcing time is 10 ms at DC. Maximum switching frequency is 1 000 operations per hour for AC-1, AC-2, AC-3, and AC-3e duty; drops to 300 operations per hour for AC-4. Mechanical life is typical 10 million operations.