The Siemens 3RT2018-1BB428K 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 medium-duty motor switching applications with stable DC coil operation and PLC compatibility.
According to Siemens SIRIUS catalog data, the 3RT2018 series (S00 size) supports up to 16 A AC-3 and 7.5 kW at 400 V, with screw terminal construction ensuring secure wiring and long-term industrial reliability in 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 state of the contactor for safe operation and diagnostics.
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3RT2 |
| Model Number | 3RT2018-1BB428K |
| 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 |
| Contact Feedback | Mirror Contact Elements |
| Terminal Type | Screw Terminals |
| Frame Size | S00 |
| Application | Motor Control & Power Switching |
| Brand | Siemens |
No reviews yet.