Siemens SIRIUS 3RT2017-1JB42 Power Contactor 12A, 5.5kW, 400V, 3-Pole, 24V DC Coil, S00, 1 NC, Screw Terminals Original Brand New

Overview: Siemens 3RT2017-1JB42 SIRIUS Power Contactor

The Siemens 3RT2017-1JB42 is a high-performance, compact 3-pole power contactor from the renowned SIRIUS 3RT2 series, designed for reliably switching motors and other resistive loads in industrial automation and control systems.

Rated for a nominal operational current of 12 A (AC-3e/AC-3) and a power output of 5.5 kW at $400\text{ V}$, this device is suitable for a wide range of standard industrial motor applications. It features a reliable 24 V DC control voltage coil with an integrated diode for surge suppression, making it directly suitable for coupling with PLC outputs. Its compact Size S00 footprint ensures minimal panel space utilization.

The contactor comes equipped with screw terminals for secure and robust wiring connections. It includes one integrated Normally Closed (1 NC) auxiliary contact.

Key Technical Specification

• Product: Power Contactor / Motor Contactor
• Article Number: 3RT2017-1JB42
• Series: Siemens SIRIUS 3RT2
• Poles: 3-pole
• Rated Operational Current (AC-3e/AC-3): 12 A (at $400\text{ V}$)
• Rated Operational Power (AC-3e/AC-3): 5.5 kW (at $400\text{ V}$)
• Control Voltage: 24 V DC
• Coil Operating Range: 0.7−1.25×Uc​
• Integrated Features: Diode for Coil Surge Suppression
• Auxiliary Contacts: 1 NC (Integrated)
• Terminal Type: Screw Terminal
• Frame Size: S00
• PLC Compatibility: Suitable for PLC outputs
• Expansion: Cannot be expanded with additional auxiliary switches.

Benefit

• PLC-Ready Control: The 24 V DC coil with integrated diode simplifies direct interfacing with modern PLC digital outputs, reducing external component requirements (like external surge suppressors) and wiring complexity.
• High Performance in a Compact Design: The Size S00 form factor provides $5.5\text{ kW}$ switching capability while saving valuable space in control cabinets.
• Secure Connections: Robust screw terminals ensure long-term, vibration-resistant electrical connections, minimizing maintenance needs.
• Integrated Reliability: The built-in 1 NC auxiliary contact provides instantaneous feedback or interlocking, essential for safety and control logic.

Function: Motor Switching and Load Control

The Siemens 3RT2017-1JB42 functions as an electromagnetically operated switch for high-current loads, primarily motors. When the $24\text{ V DC}$ control voltage is applied to the coil, the contactor draws in, closing the three main power contacts to supply the $5.5\text{ kW}$ load. The integrated auxiliary contact simultaneously changes state (the NC contact opens), providing a status signal to the control system (e.g., PLC). It is a core component for starting, stopping, and controlling the direction of three-phase electric motors.

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