The Siemens 3RT2038-1AG20 is a SIRIUS power contactor in size S2, designed for motor switching in control panels. It carries a mechanical life of 10 million operations and supports up to 700 switching cycles per hour under AC-1 duty, 500 per hour under AC-3. Rated for operation from -25 to +60 °C and storage from -55 to +80 °C, it fits a 114 x 55 x 130 mm envelope and mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715.
Mounting and fit
Clearance requirements: 10 mm upward, 10 mm downward, 10 mm forward, 10 mm rearward, and 6 mm to the side. Mounting position permits +/-180° rotation on a vertical surface and +/-22.5° tilt forward/backward. The magnet coil connection uses screw-type terminals, and the main contacts accept dual conductors from 0.5 to 2.5 mm² solid or stranded.
For high-cycle applications, note the maximum operating frequency: AC-1 resistive loads 700 cycles/h, AC-2 slip-ring motors 350/h, AC-3 squirrel-cage motors 500/h, AC-4 plugging/inching 150/h.