The Siemens 3RT2018-1BF428K 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 AC/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, ensuring dependable performance in medium-duty motor switching applications with flexible AC/DC coil operation.
According to Siemens technical datasheets for the 3RT2018 S00 family, devices in this range are designed for 16 A AC-3 switching and 7.5 kW motor loads at 400 V AC, with robust screw terminal construction for secure and long-lasting wiring in industrial 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 state of the contactor and improve operational safety.
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3RT2 |
| Model Number | 3RT2018-1BF428K |
| 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 AC/DC |
| Auxiliary Contact | 1 NO |
| Contact Feedback | Mirror Contact Elements |
| Terminal Type | Screw Terminals |
| Frame Size | S00 |
| Application | Motor Control & Power Switching |
| Brand | Siemens |
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