The Siemens 3RT2023-1BB40 is a SIRIUS 3RT2 series S0 frame 3-pole power contactor designed for switching 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, safety interlocking circuits, and MCC panels.
This model belongs to the S0 size range, which is commonly used for medium-duty motor applications and provides reliable switching performance with higher durability compared to S00 frame contactors.
According to Siemens official 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 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 essential for PLC safety logic and interlocking, ensuring the controller can confirm the real switching state of the contactor rather than relying only on the command signal.
With screw terminals, installation remains secure, vibration-resistant, and suitable for long-term industrial use in electrical panels.
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3RT2 |
| Model Number | 3RT2023-1BB40 |
| Product Type | Power Contactor |
| Contactor Configuration | 3 Pole |
| Rated Current (AC-3) | 9 A |
| Motor Rating | 4 kW @ 400 V AC |
| Coil Type | 24 V DC |
| Auxiliary Contact | 1 NO + 1 NC (variant dependent) |
| Contact Feedback | Mirror Contact Elements |
| Terminal Type | Screw Terminals |
| Frame Size | S0 |
| Application | Motor Control & Power Switching |
| Brand | Siemens |
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