🔹 Siemens SIRIUS 3RT2 Power Contactor – 3RT2028-1BB408K (AC-3 Duty, 3-Pole, 24V DC Coil, S0 Size, 38A Class, 1NO+1NC Auxiliary)
The Siemens 3RT2028-1BB408K is a high-performance 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 higher current handling capacity 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 wiring connections and long-term operational stability in demanding electrical environments.
It is equipped with a 24V DC coil variant (BB408K), making it suitable for PLC-based control circuits and modern industrial automation systems where DC control voltage is preferred.
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: 3RT2028-1BB408K
• 3-Pole heavy-duty switching design
• AC-3 duty optimized for motor control applications
• 24V DC coil (BB408K 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 | 3RT2028-1BB408K |
| 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 (BB408K) |
| Auxiliary Contacts | 1NO + 1NC |
| Terminal Type | Screw Terminals |
| Mounting Type | Panel / DIN Rail (via accessories) |
| Brand | Siemens |
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