Power Contactors, AC-3 18A, 7.5kW/400V, 24V DC Coil, 3-Pole, Screw Terminals, S0 Size - 3RT2023-1BB408K

🔹 Power Contactor with Mirror Contact Elements, Screw Terminals, AC/DC Coil – 3RT2023-1BB408K

The Siemens 3RT2023-1BB408K is a SIRIUS 3RT2 series S0 frame 3-pole power contactor designed for reliable switching of three-phase motors up to 4 kW at 400 V AC. It features mirror contact elements, screw terminals, and a 24 V DC control coil, making it suitable for industrial motor control, PLC automation systems, safety interlocking, and MCC panels.

This model belongs to the S0 size range, commonly used for medium-duty motor applications where higher durability and thermal stability are required compared to S00 contactors.

According to Siemens SIRIUS technical datasheets, the 3RT2023 series is rated at 9 A AC-3, supporting motor loads up to 4 kW at 400 V AC, with standard 3 NO main contacts and auxiliary contacts (typically 1 NO + 1 NC depending on configuration).

The mirror contact elements provide mechanically linked feedback of the main contacts, which is critical for PLC interlocking and safety circuits, ensuring the controller can verify the actual switching state of the contactor rather than only the command signal.

With screw terminals, wiring is secure and vibration-resistant, making it suitable for long-term installation in industrial control cabinets.

🔹 Key Features

• Siemens SIRIUS 3RT2 series power contactor
• Model: 3RT2023-1BB408K
• 3-pole motor switching contactor
• Rated AC-3 current: 9 A
• Motor rating: 4 kW @ 400 V AC
• Control coil: 24 V DC (with suppression/diode module variant family)
• Mirror contact elements for safety feedback
• Screw terminal connection system
• Compact S0 frame size
• Auxiliary contacts: typically 1 NO + 1 NC
• High electrical endurance and reliable switching
• Suitable for industrial automation, MCC panels, HVAC, and safety circuits
• Compatible with Siemens SIRIUS modular accessories