The Siemens 3RT2028-1AG208KA0 is a heavy-duty SIRIUS 3RT2 3-pole power contactor engineered for reliable switching of 3-phase motors and demanding electrical loads. Built for high operational endurance, this Size S0 contactor operates on a 110V AC control coil (50/60Hz) and delivers high performance in motor control centers, industrial automation, and machinery applications.
38A Current Rating (AC-3 / AC-3e): Optimized for direct-on-line switching and efficient control of 3-phase motors rated up to 18.5 kW at 400V AC.
1NO + 1NC Auxiliary Contacts: Features integrated 1 Normally Open and 1 Normally Closed auxiliary contacts for flexible interlocking, status signaling, and control logic.
110V AC Control Coil (50/60Hz): Standard industrial control voltage for seamless integration with PLCs, control transformers, and safety circuits.
Compact Size S0 Frame: High power density in a space-saving design, allowing easy mounting inside control panels and Motor Control Centers (MCC).
Screw Terminal Connections: Provides secure, vibration-proof electrical wiring for safety and hassle-free maintenance.
Siemens SIRIUS Standards: Ensures maximum electrical and mechanical service life, high switching frequency, and reliable protection in rugged environments.
Motor Control Centers (MCC) & Automation Control Panels
Industrial Pumps, Compressors, Blowers, and Fans
Conveyor Systems & Material Handling Equipment
Industrial HVAC & Refrigeration Units
OEM Machine Building and Power Distribution Panels
Q1: What is the coil voltage for the Siemens 3RT2028-1AG208KA0 contactor?
A: This model operates on a 110V AC coil voltage at 50/60Hz, making it ideal for standard industrial control circuits.
Q2: What is the maximum motor rating supported by this contactor?
A: It is rated for 38A (AC-3/AC-3e) and can switch 3-phase motors up to 18.5 kW at 400V AC.
Q3: Does this contactor include auxiliary contacts?
A: Yes, it features integrated 1NO (Normally Open) + 1NC (Normally Closed) auxiliary contacts for signaling and interlocking functions.
Q4: Can auxiliary contact blocks or surge suppressors be added to this model?
A: Yes, being part of the modular Siemens SIRIUS 3RT2 system, you can easily attach snap-on auxiliary blocks, surge suppressors, and function modules to the S0 frame.
| 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 |
No reviews yet.