The Siemens 3RT2028-1AG208KA0 is a SIRIUS 3RT2 3-pole power contactor designed for reliable switching of three-phase motors and industrial loads. Rated at 38A (AC-3e/AC-3) and suitable for motors up to 18.5kW at 400V AC, it is an ideal solution for motor control centers, industrial automation, HVAC systems, conveyors, pumps, compressors, and machine-building applications. It features a 110V AC, 50/60Hz operating coil and 1 Normally Open (1NO) + 1 Normally Closed (1NC) auxiliary contacts, enabling efficient control, monitoring, and interlocking functions.
Designed in a compact S0 frame size, the contactor is equipped with screw terminal connections for secure wiring, easy installation, and simplified maintenance. Built to Siemens' SIRIUS quality standards, it delivers high electrical endurance, excellent switching performance, and a long mechanical service life, making it suitable for demanding industrial environments.
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Part Number | 3RT2028-1AG208KA0 |
| Product Series | SIRIUS 3RT2 |
| Product Type | Power Contactor |
| Rated Operational Current (AC-3e/AC-3) | 38 A |
| Motor Rating | 18.5 kW at 400 V AC |
| Main Contacts | 3-Pole |
| Auxiliary Contacts | 1NO + 1NC |
| Coil Voltage | 110 V AC, 50/60 Hz |
| Connection Type | Screw Terminals |
| Frame Size | S0 |
| Rated Insulation Voltage | 690 V |
| Rated Impulse Withstand Voltage | 6 kV |
| Degree of Protection | IP20 (Front) |
| Mounting | DIN Rail or Panel Mount |
| Operating Temperature | -25°C to +60°C |
| Mechanical Service Life | High Mechanical Endurance |
| Standard | IEC 60947-4-1 |
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