Siemens 3RT2344-1AC20 Contactor 4-Pole AC-1, 110A, 24V AC Control, S3 Size with 1NO+1NC Aux Contact Original Brand New

Overview

The Siemens 3RT2344-1AC20 is a powerful and reliable 4-pole contactor from the SIRIUS 3RT2 series, specifically engineered for AC-1 applications. This robust device is perfectly suited for switching non-inductive or weakly inductive loads, disconnecting power generation plants from the grid, and facilitating transfer switching in various industrial and commercial settings. Built to exacting international standards like IEC 60947, it ensures safe and efficient operation. Its compact Size S3 design, combined with a high current rating of 110 A at 400 V (40 °C), makes it a versatile component for demanding electrical control systems.

Key Benefit

• Optimized for AC-1 Applications: Specifically designed for switching non-inductive loads, ensuring efficient and reliable operation in resistive heating, lighting, and distribution circuits.
• High Current Capacity: Handles up to 110 A at 400 V (40 °C), making it suitable for substantial power switching requirements.
• Versatile Control Voltage: Features a 24 V AC (50/60 Hz) coil, offering flexibility in control circuit design.
• Integrated Auxiliary Contacts: Comes standard with 1 NO (Normally Open) + 1 NC (Normally Closed) auxiliary contacts, simplifying circuit design for interlocking, signaling, and control functions.
• Robust Screw Terminals: Provides secure and straightforward wiring connections for both main and auxiliary circuits.
• Compact Size S3 Design: Offers a high power-to-size ratio, optimizing space within control panels.
• Adherence to Global Standards: Manufactured in compliance with IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1 (for auxiliary switches), ensuring international compatibility and safety.
• Expandable Functionality: Supports the addition of further auxiliary switches for enhanced control possibilities.
• Long-Term Reliability: Part of the trusted Siemens SIRIUS range, known for its durability and performance in demanding industrial environments.

Function & Features:

• Four-Pole Switching: Enables simultaneous control of four independent circuits, ideal for three-phase systems with neutral or multiple single-phase circuits.
• AC-1 Duty Rating: Specifically rated for non-inductive or weakly inductive loads, ensuring optimal performance and lifespan in these applications.
• 24V AC Coil: Electromagnetic operating mechanism provides reliable switching action with a common industrial control voltage.
• Integrated 1NO + 1NC Auxiliary Contacts: These built-in contacts provide feedback and control signals, essential for automation and safety interlocks.
• Screw Terminal Connections: Provides robust and reliable electrical connections for easy installation and maintenance.
• Protection Features:
  • Short-circuit & Overload Protection: Main and auxiliary connections require external protection (e.g., miniature circuit breakers or fuses) as per technical data sheets and configuration manuals.
  • Overvoltage Protection: Can be retrofitted with surge suppressors (RC elements, varistors, diodes) for coil damping, protecting against opening surges.
• Electromagnetic Compatibility (EMC): Fulfills requirements for environment category A, ensuring reliable operation in industrial electromagnetic environments.
• Contact Reliability: Auxiliary contacts are designed for high contact reliability, even at low voltages (≤ 110 V) and currents (≤ 100 mA), making them suitable for solid-state circuits.
• Motor Protection Integration: Compatible with Siemens 3RU2 thermal overload relays or 3RB3 electronic overload relays for comprehensive motor protection when used in motor feeder applications.
• Replaceable Solenoid Coil: The solenoid coil can be replaced, extending the lifespan of the contactor.
• Flexible Mounting Options: Designed for straightforward installation within control panels.

Application

The Siemens 3RT2344-1AC20 contactor is an excellent choice for a wide range of industrial and commercial applications, including:

• Switching resistive loads (e.g., heating elements, lighting systems)
• Controlling non-inductive or weakly inductive loads in distribution boards
• Disconnecting power generation plants (e.g., solar inverters, small generators) from the grid
• Implementing transfer switching operations
• Integration into custom load feeders for various electrical systems

Standards & Protection:

This contactor adheres to rigorous international standards, including IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1 for auxiliary switches. For optimal safety and longevity, all connections must be protected against short circuits, overloads, and overvoltages using suitable measures as outlined in the technical product data sheet and relevant configuration manuals. Detailed guidance on the protection of main, auxiliary, and control supply voltage connections is available in the product documentation and Siemens’ Digital and Configuration Manuals for load feeders.

Connection Methods:

• Main Circuit: Features screw terminals with a box terminal. Direct connection to the connecting bar is possible with cable lugs when the box terminal is removed.
• Auxiliary & Control Circuit: Utilizes reliable screw terminals for secure wiring.

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