🔹 Siemens SIRIUS 3RT2 Power Contactor – 3RT2028-1BM408K (AC-3 Duty, 3-Pole, 24V DC Coil, S0 Size, 38A Class, 1NO+1NC Auxiliary)
The Siemens 3RT2028-1BM408K is a high-capacity SIRIUS 3RT2 series power contactor designed for reliable switching of motors and industrial loads under AC-3 duty applications. It belongs to the S0 frame size category, offering enhanced current handling capability with a compact and modular design suitable for industrial control panels and power distribution systems.
This model features a 3-pole configuration with durable screw-type terminals, ensuring secure and vibration-resistant wiring connections for long-term operational stability.
It is equipped with a 24V DC coil variant (BM408K), making it suitable for PLC-based control systems and modern industrial automation applications where DC control voltage is required.
A key feature of this variant is its integrated auxiliary contact configuration (1NO + 1NC), providing reliable feedback and control signal integration in switching and interlocking operations.
Built on the Siemens SIRIUS modular platform, it supports seamless integration with overload relays and accessory modules, enabling flexible and scalable panel design for modern industrial requirements.
With high electrical endurance, strong switching capability, and stable performance under frequent operations, this contactor ensures dependable operation in industrial environments.
• Genuine Siemens SIRIUS 3RT2 Series Contactor
• Model: 3RT2028-1BM408K
• 3-Pole heavy-duty switching design
• AC-3 duty optimized for motor control applications
• 24V DC coil (BM408K variant)
• S0 frame size (38A class)
• Screw terminal connection for secure wiring
• Integrated auxiliary contacts (1NO + 1NC)
• Compact modular design for panel integration
• High electrical and mechanical endurance
• Compatible with Siemens overload relays & accessories
• Suitable for industrial automation systems
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3RT2 |
| Model Number | 3RT2028-1BM408K |
| Product Type | Power Contactor |
| Frame Size | S0 |
| Poles | 3 Pole |
| Utilization Category | AC-3 / AC-3e |
| Rated Current | ~38 A |
| Power Rating | ~18.5 kW @ 400V |
| Coil Voltage | 24V DC (BM408K) |
| Auxiliary Contacts | 1NO + 1NC |
| Terminal Type | Screw Terminals |
| Mounting Type | Panel / DIN Rail (via accessories) |
| Brand | Siemens |
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