The Siemens 3RT2018-1BB418K is a SIRIUS 3RT2 series 3-pole power contactor designed for reliable switching of three-phase motors up to 7.5 kW at 400 V AC. It features mirror contact elements, screw terminal connections, and a 24 V DC control coil, making it suitable for motor control centers (MCCs), automation systems, HVAC applications, and industrial power distribution systems.
This model belongs to the compact S00 frame size and is rated for AC-3 / AC-3e duty up to 16 A, which makes it suitable for medium-duty motor switching applications with stable DC coil operation and reliable PLC integration.
According to Siemens technical listings, the 3RT2018-1BB418K includes 3 NO main contacts, 1 NO auxiliary contact, and screw terminals, ensuring secure wiring and consistent performance in industrial control panels.
The mirror contact elements provide mechanically linked feedback of the main contacts, which is essential for PLC interlocking, safety circuits, and machine monitoring systems, allowing the controller to verify the actual ON/OFF state of the contactor for safe operation and diagnostics.
With screw terminals, installation remains vibration-resistant, secure, and suitable for long-term industrial use.
• Siemens SIRIUS 3RT2 series power contactor
• Model: 3RT2018-1BB418K
• 3-pole motor switching contactor
• Rated AC-3 current: 16 A
• Motor rating: 7.5 kW @ 400 V AC
• Control coil: 24 V DC
• Mirror contact elements for safety feedback
• Screw terminal connection system
• Compact S00 frame size
• 3 NO main contacts + 1 NO auxiliary contact (variant dependent)
• High electrical endurance and reliable switching
• Suitable for industrial automation and MCC panels
• Compatible with Siemens SIRIUS modular accessories
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3RT2 |
| Model Number | 3RT2018-1BB418K |
| Product Type | Power Contactor |
| Contactor Configuration | 3 Pole |
| Rated Current (AC-3) | 16 A |
| Motor Rating | 7.5 kW @ 400 V AC |
| Coil Type | 24 V DC |
| Auxiliary Contact | 1 NO |
| Main Contacts | 3 NO |
| Contact Feedback | Mirror Contact Elements |
| Terminal Type | Screw Terminals |
| Frame Size | S00 |
| Application | Motor Control & Power Switching |
| Brand | Siemens |
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