The Siemens 3RT2024-2DB40 is a SIRIUS power contactor in the Size S0 frame, built for switching motor and resistive loads in industrial control panels. It mounts on 35 mm DIN rail per DIN EN 60715 — screw or snap-on — and accepts solid or stranded conductors from 1 to 10 mm² at the spring-type terminals. The 24 VDC coil pulls in at 0.8 × rated voltage (19.2 V) and holds across the full operating range of -25 to +60 °C, with storage tolerance from -55 to +80 °C. DC switching capability is specified per voltage: 6 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 contact ratings for DC loads, not the AC motor ratings. Mechanical life is rated at 10 million operations typical; electrical switching frequency maxes out at 1 000 cycles per hour for AC-1, AC-2, AC-3, and AC-3e duty, dropping to 300 cycles per hour for AC-4. The contactor carries one normally-open and one normally-closed auxiliary contact (18 … 8 configuration on the main contacts).
Mounting and Clearances
The 45 mm wide, 102 mm tall, 107 mm deep envelope fits standard Size S0 panel cutouts. Required clearances: 10 mm upward, 10 mm forward, 10 mm downward, and 6 mm at the sides. The mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward or backward, which helps when routing cables in tight enclosures.