The Siemens 3RT2023-2KB40 is a SIRIUS Size S0 coupling contactor with a 24 VDC coil rated at 10 A. It uses spring-type terminals for the magnet coil and main contacts, accepting solid or stranded wire from 1 to 10 mm². Mounting is via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, with the mounting position allowing ±180° rotation and ±22.5° tilt on a vertical surface.
Key Ratings & Fit
The 24 VDC coil draws an initial inrush of 1.25 A and holds at 0.7 A. The main contacts switch up to 10 A at 24 V, with arcing time between 10 and 21 ms depending on DC conditions. Operating temperature range is -25 to +60 °C; storage range extends to -55 to +80 °C. The S0 frame size (102 mm high, 45 mm wide, 107 mm deep) fits standard panel layouts, with clearance requirements of 10 mm upward/downward/forward and 6 mm at the sides.
Integration Notes
Spring-cage terminals accept 1 to 10 mm² solid or stranded wire, or 2x 0.5 to 2.5 mm². The auxiliary switch is built in. Maximum switching frequency is 1,000 operations per hour for AC-1, AC-2, AC-3, and AC-3e duty, dropping to 300 per hour for AC-4. Mechanical life is typically 10 million cycles.