The Siemens 3RT2017-1BB428K is a SIRIUS 3RT2 series 3-pole power contactor designed for reliable switching of three-phase motors up to 5.5 kW at 400 V AC. It comes with 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 12 A, making it suitable for standard industrial motor switching applications. Based on Siemens SIRIUS 3RT2017 technical data, the series supports 12 A AC-3 rating with 5.5 kW motor switching at 400 V AC, ensuring stable performance in control panel environments.
The variant includes 2 NO + 2 NC auxiliary contacts, which provide flexible switching options for control logic, interlocking, signaling, and PLC feedback circuits. This makes it more versatile compared to basic auxiliary configurations.
The integrated mirror contact elements ensure mechanically linked feedback of the main contacts, which is essential for safety circuits and machine monitoring systems, allowing the controller to verify the real ON/OFF status of the contactor for safe operation.
With screw terminals, wiring remains secure, vibration-resistant, and suitable for long-term industrial use.
• Siemens SIRIUS 3RT2 series power contactor
• Model: 3RT2017-1BB428K
• 3-pole motor switching contactor
• Rated AC-3 current: 12 A
• Motor rating: 5.5 kW @ 400 V AC
• Control coil: 24 V DC
• Auxiliary contacts: 2 NO + 2 NC
• Mirror contact elements for safety feedback
• Screw terminal connection system
• Compact S00 frame size
• High electrical endurance and reliability
• Suitable for industrial automation and MCC panels
• Compatible with Siemens SIRIUS modular accessories
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3RT2 |
| Model Number | 3RT2017-1BB428K |
| Product Type | Power Contactor |
| Contactor Configuration | 3 Pole |
| Rated Current (AC-3) | 12 A |
| Motor Rating | 5.5 kW @ 400 V AC |
| Coil Type | 24 V DC |
| Auxiliary Contacts | 2 NO + 2 NC |
| Contact Feedback | Mirror Contact Elements |
| Terminal Type | Screw Terminals |
| Frame Size | S00 |
| Application | Motor Control & Power Switching |
| Brand | Siemens |
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