The Siemens 3RT2018-1BB41 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, making it suitable for standard medium-duty motor switching applications with reliable DC control operation.
According to Siemens official catalog data, the 3RT2018-1BB41 includes 3 NO main contacts, 1 NO auxiliary contact, and screw terminals, ensuring safe and stable integration 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 real ON/OFF status of the contactor for safer operation and diagnostics.
With screw terminals, the device ensures vibration-resistant wiring and long-term reliability in industrial environments.
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3RT2 |
| Model Number | 3RT2018-1BB41 |
| 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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