Siemens 3RT2023-1KB40 Power Contactor, SIRIUS 3RT2, 9A, 4kW/400V, 24V DC, 1NO+1NC Auxiliary Original Brand New

Overview: Reliable Motor Switching for Industrial Control

The Siemens 3RT2023-1KB40 Power Contactor from the SIRIUS 3RT2 family is a high-performance, 3-pole device designed for switching three-phase motors up to 4 kW at 400 V (AC-3e/AC-3 utilization category).

Engineered for seamless integration into modern industrial control systems, this Size S0 contactor features a low-power 24 V DC control voltage, making it perfectly suitable for direct control by PLC (Programmable Logic Controller) outputs. It comes with a built-in plugged-in varistor for coil protection, ensuring reliable operation and longevity in complex automation environments.

With its compact design and robust screw terminals, the 3RT2023-1KB40 offers a reliable and efficient solution for motor control applications where a non-expandable, feature-rich base unit is required.

Benefit

• Optimized for PLC Integration: The 24V DC coil voltage and low switching power are ideal for direct wiring to PLC digital output cards, simplifying wiring and reducing interface components.
• High Reliability: Part of the globally proven Siemens SIRIUS 3RT2 family, known for its long mechanical and electrical service life (typically 10 million operating cycles).
• Space-Saving Design (Size S0): Compact footprint in the control cabinet allows for high-density panel design.
• Surge Protected: Integrated varistor provides coil suppression, protecting the contactor coil and prolonging the life of the controlling PLC output.
• Clear Status Indication: Built-in 1 NO + 1 NC auxiliary contacts offer immediate feedback on the contactor’s status for monitoring and safety interlocking circuits.
• Simple Wiring: Robust screw terminals ensure a secure and durable electrical connection.

Function

The Siemens 3RT2023-1KB40 functions as an electromechanical switch for controlling the flow of power to a connected load, typically a 3-phase motor. When the 24V DC control coil is energized (e.g., by a PLC output), the main contacts close, connecting the motor to the power supply. The integrated auxiliary contacts change state simultaneously to provide feedback or enable interlocking. The non-expandable design means this contactor is suited for simple, standard applications where no further accessories like additional auxiliary switch blocks are needed.