Siemens SIRIUS 3RT2023-1FB40 Power Contactor, 3-Pole, 9A, 4kW, 24V DC Coil, Size S0 Original Brand New

Overview

The Siemens SIRIUS 3RT2023-1FB40 is a high-performance, 3-pole power contactor designed for switching motors up to 4 kW at 400 V (AC-3/AC-3e). Part of the trusted SIRIUS 3RT20 modular system, this robust contactor ensures reliable operation and a high degree of contact stability. It features a low-consumption 24 V DC control voltage with a plugged-in diode combination for coil protection, making it ideal for integration into modern control systems, including PLC outputs. Its compact Size S0 footprint saves space in the control cabinet.

Key Technical Specifications

• Product Type: Power Contactor (Motor Contactor)
• Manufacturer: Siemens
• Series: SIRIUS 3RT20
• Product Number: 3RT2023-1FB40
• IEC Utilization Category: AC-3e / AC-3
• Operational Current (Ie) at 400V (AC-3/AC-3e): 9 A
• Operational Power (Pe) at 400V: 4 kW
• Number of Poles: 3-pole
• Control Supply Voltage (Us): 24 V DC
• Surge Suppressor: Integrated plugged-in diode combination
• Auxiliary Contacts: 1 Normally Open (NO) + 1 Normally Closed (NC)
• Terminal Type: Screw Terminal
• Contactor Size: S0

Benefits & Features

• Reliable Performance: High mechanical and electrical service life typical of the SIRIUS family.
• Space-Saving Design: Compact Size S0 allows for efficient use of panel space.
• PLC Compatible: The 24 V DC coil with integrated diode protection is specifically suited for interfacing with sensitive PLC (Programmable Logic Controller) outputs, minimizing back EMF.
• Versatile Application: Suitable for switching 3-phase AC motors and resistive loads (AC-1/AC-3/AC-3e).
• Quick Installation: Features user-friendly screw terminals for secure wiring.
• Safety Integration: Built-in auxiliary contacts (1 NO + 1 NC) provide feedback and interlocking capability for comprehensive control schemes.
• Standardized Accessories: Compatible with the extensive SIRIUS modular accessories (e.g., overload relays, auxiliary switches) for flexible system configurations.

Function

The Siemens 3RT2023-1FB40 contactor functions as an electrically controlled switch used to turn a power circuit on and off. Upon receiving a 24 V DC control signal at its coil terminals, the main contacts close, connecting the three-phase power to the load (e.g., an industrial motor). The plugged-in diode suppresses voltage spikes (back EMF) generated when the DC coil is de-energized, protecting the control circuit components (like transistors or relays). The integrated 1 NO + 1 NC auxiliary contacts provide status signaling to the control system or are used for self-holding circuits.

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