Siemens SIRIUS 3RT2344-1AV00 Contactor 4-Pole, AC-1, 110A, 400V AC, S3 Size Original Brand New

Overview

The Siemens SIRIUS 3RT2344-1AV00 is a high-performance 4-pole power contactor engineered for reliable switching of AC-1 (non-inductive or weakly inductive) loads up to 110A at 400V / 40 °C. Part of the renowned SIRIUS family, this robust Size S3 contactor is designed for demanding industrial applications. It features a 400V AC, 50 Hz operating mechanism and comes equipped with convenient screw terminals, along with a built-in 1 normally open (NO) and 1 normally closed (NC) auxiliary contact for enhanced control and signaling. The 3RT2344-1AV00 is ideal for disconnecting loads, managing power generation plants, and transfer switching applications.

Key Benefits:

• Reliable AC-1 Switching: Specifically designed for switching non-inductive or weakly inductive loads, ensuring stable and efficient operation.
• High Current Capacity: Handles up to 110A at 400V / 40 °C, suitable for a wide range of power applications.
• Integrated Auxiliary Contacts: Includes 1 NO + 1 NC auxiliary contacts for versatile control circuit integration and status feedback.
• Robust & Durable: Built to Siemens’ high quality standards, ensuring long-term reliability and performance in industrial environments.
• Easy Installation: Features straightforward screw terminals for secure and efficient wiring.
• Compact Size S3: Optimized dimensions for efficient use of space within control panels.
• Enhanced Safety: Complies with international standards IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1, providing peace of mind regarding safety and performance.

Functions

The Siemens 3RT2344-1AV00 contactor primarily functions as an electrically operated switch for power circuits. Its key functions include:

• Switching AC-1 Loads: Efficiently opens and closes circuits for resistive or non-inductive loads.
• Load Disconnection: Provides a reliable means to disconnect electrical loads or power generation plants from the grid.
• Transfer Switching: Can be utilized in applications requiring the transfer of power between different sources.
• Control Circuit Integration: The integrated auxiliary contacts allow for interlocking, signaling, and control of other devices within an automation system.

Compliance & Protection:

The 3RT2344-1AV00 adheres to rigorous international standards, ensuring safe and reliable operation. Proper protection measures for device connections are crucial:

• Short-Circuit and Overload Protection of Main Connections: Refer to the technical product data sheet for specific guidance on free-standing contactor protection. For device combinations (contactor with overload relay or circuit breaker), consult the Digital Configuration Manual or Configuration Manual for load feeders.
• Short-Circuit and Overload Protection of Auxiliary Connections: Detailed information can be found in the technical product data sheet for auxiliary contact protection.
• Short-Circuit and Overload Protection of Control Supply Voltage: Adherence to relevant standards and regulations for control panel configuration is essential. Consider power supplies with current-limiting functions and select appropriate protection devices based on contactor load characteristics (inrush current, switch-on power, holding power).
• Overvoltage Protection at Control Supply Voltage: For 3RT23 contactors supplied without a coil circuit, surge suppressors (RC elements, varistors, diodes, or diode assemblies) can be retrofitted. Note that damping may increase break and delay times.

Connection Methods:

• Main Circuit (3RT2344): Screw terminals with box terminal. Direct connection to the connecting bar is possible with cable lugs when the box terminal is removed.
• Auxiliary and Control Circuit: Screw terminals.

Electromagnetic Compatibility (EMC):

The contactors fulfill the requirements for environment category A. When used with frequency converters, specific configuration notes in the Equipment Manual must be observed.

Contact Reliability of Auxiliary Contacts:

For switching voltages $\le$ 110 V and currents $\le$ 100 mA, the auxiliary contacts of 3RT contactors (like the 3RT2344-1AV00) are highly reliable, particularly suitable for solid-state circuits with currents $\ge$ 1 mA at voltages of 17 V and higher.

Motor Protection:

While the 3RT2344-1AV00 is an AC-1 contactor, for overload protection in motor applications (if used in a motor feeder combination), 3RU2 thermal overload relays or 3RB3 electronic overload relays can be mounted onto 3RT23 contactors.

Operating Mechanism:

This 3RT23 contactor features a conventional AC operating mechanism. Control is via the A1-A2 control supply voltage connection with varying operating ranges (see technical product data sheet for details).

Maintenance & Expansion:

• Solenoid Coil Replacement: The solenoid coil of the 3RT2344-1AV00 can be replaced.
• Auxiliary Contact Replacement: Only the contacts for 3RT233 contactors can be replaced (this applies to the series, not specifically to the 3RT2344-1AV00’s integrated contacts).
• Auxiliary Contact Expansion: The basic unit of the 3RT2344-1AV00 includes two integrated auxiliary contacts (1 NO + 1 NC). Additional auxiliary switches can be mounted to expand capabilities, adhering to permissible configurations. Refer to “Auxiliary switches, instantaneous” for detailed information.

Accessories and Spare Parts:

A wide range of accessories and spare parts are available for SIRIUS 3RT2 contactors, including surge suppressors, auxiliary switches, and more. For specific ordering data, refer to the “Accessories and spare parts for SIRIUS 3RT2 contactors and SIRIUS 3RH2 contactor relays” section in the Siemens catalog or on Turll.

Application

The Siemens 3RT2344-1AV00 contactor is ideally suited for:

• Four-pole switching of weak or non-inductive loads (AC-1).
• Disconnecting loads or power generation plants from the electrical grid.
• Transfer switching applications.

For motor-driven loads (AC-3), Siemens offers special versions of the 3RT23 contactors.

For more Siemens industrial automation products and solutions, visit Turll.