Siemens SIRIUS 3RT2028-1CL24-3MA0 — Power Contactor, S0 Frame, 24 VDC Coil
The Siemens SIRIUS 3RT2028-1CL24-3MA0 is a power contactor in the S0 frame size, designed for motor switching and general load control in industrial panels. It uses a 24 VDC magnet coil with screw-type terminals and mounts on 35 mm DIN rail per DIN EN 60715, with screw and snap-on fastening. Rated for AC-1 (resistive) duty at up to 1,000 switching cycles per hour, AC-2 and AC-3 (motor starting) at 750 cycles/hour, and AC-4 (plugging/inching) at 250 cycles/hour. The main contacts accept solid or stranded conductors from 1 to 10 mm². Auxiliary contact ratings are specified per IEC: 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. The auxiliary switch is not included as standard — verify if your application requires an add-on block.
Mounting and Integration
The mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward. Clearance requirements: 10 mm upwards, 10 mm forwards, 10 mm downwards, 6 mm at the side. Dimensions: 85 mm height, 45 mm width, 141 mm depth. The depth is a key panel-fit dimension — verify against your enclosure depth before specifying.
Environmental and Lifecycle
Mechanical endurance is rated at 10,000,000 operating cycles typical. Arcing time is 10 ms at AC. Main contact gap is 16 to 8 mm.