Siemens 3TB4311-0XB0 Contactor 22A, 11kW, 24V AC Coil, 1NC Auxiliary, Size 1 Original Brand New

Siemens 3TB4311-0XB0 Contactor – High-Performance Motor Control Solution

Overview

The Siemens 3TB4311-0XB0 is a robust and reliable AC contactor designed for a wide range of industrial applications, particularly for controlling electric motors. Part of the trusted Siemens product family, this device is engineered to provide safe and efficient power switching. With its compact Size 1 frame, it’s an excellent choice for installations where space is a consideration. This contactor is built to handle an AC-3 rating of 22A at 400V, making it suitable for motors up to 11 kW.

Key Features & Benefit

• Robust Performance: Rated for an AC-3 current of 22A at 400V, it is capable of controlling motors up to 11 kW (at 50 Hz), ensuring reliable performance under load.
• Energy-Efficient Coil: The 24V AC 50 Hz coil provides reliable switching while being compatible with common low-voltage control circuits.
• Built-in Auxiliary Contact: Includes a pre-installed normally closed (NC) auxiliary contact (1NC), which is crucial for interlock circuits, signaling, and control logic.
• Secure Screw Connections: Features durable screw terminals for a secure and long-lasting electrical connection, making installation straightforward and reliable.
• Compact & Space-Saving: The Size 1 frame is designed to fit into panels and enclosures without taking up excessive space, ideal for modern control systems.
• German Engineering & Quality: Manufactured by Siemens, a global leader in industrial automation, ensuring high quality, durability, and a long service life.

Functionality

The Siemens 3TB4311-0XB0 functions as an electromagnetically operated switch. When the 24V AC control voltage is applied to the coil, it creates a magnetic field that closes the main power contacts. This allows current to flow to the connected load, such as an electric motor. When the control voltage is removed, the magnetic field collapses, and a spring forces the contacts open, interrupting the power flow. The integrated 1NC auxiliary contact operates in reverse; it is open when the main contacts are closed and closes when the main contacts are open, providing a signal for control systems.

Technical Specification

• Product Type: Contactor
• Product Number: 3TB4311-0XB0
• Frame Size: Size 1
• Rated Operational Current (Ie): 22 A (at AC-3, 400V)
• Rated Power (P): 11 kW (at AC-3, 400V, 50 Hz)
• Number of Poles: 3-pole
• Auxiliary Contacts: 1 NC (Normally Closed)
• Coil Voltage: 24 V AC, 50 Hz
• Connection Type: Screw terminals
• Mounting: Standard DIN rail or screw mounting

Application

The 3TB4311-0XB0 is a versatile component suitable for various industrial and commercial applications, including:

• Controlling AC motors in machinery, pumps, fans, and conveyor systems.
• Switching resistive loads (e.g., heating elements).
• Use in control panels, motor starters, and automation systems.
• General power switching applications.

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