Siemens SIRIUS 3RT2326-1AB00 Contactor 40A, 4-Pole, AC-1, 24V AC Coil, Screw Terminal, Size S0 Original Brand New

Siemens SIRIUS 3RT2326-1AB00 Contactor: Reliable 4-Pole Switching for AC-1 Applications

The Siemens SIRIUS 3RT2326-1AB00 is a high-performance 4-pole contactor designed for efficient switching of non-inductive or weakly inductive loads in AC-1 applications. With a rated current of 40 A at 400 V / 40 °C, this robust contactor is a critical component for various industrial and power generation setups. Its 24 V AC, 50 Hz coil ensures reliable operation, while the integrated 1 normally open (NO) and 1 normally closed (NC) auxiliary contacts provide versatile control options. Featuring convenient screw terminals and a compact S0 size, the 3RT2326-1AB00 offers straightforward integration into control panels and systems.

Product Overview

The Siemens 3RT2326-1AB00 is part of the renowned SIRIUS 3RT23 series, known for its reliability, durability, and adherence to international standards. This specific model excels in applications requiring the switching of resistive loads, heating circuits, or non-motor loads. Its robust design ensures long-term performance in demanding industrial environments.

Benefit

• Reliable Switching: Engineered for dependable performance in switching non-inductive and weakly inductive loads, ensuring stable operation of connected equipment.
• Enhanced Control: Integrated 1 NO + 1 NC auxiliary contacts offer immediate feedback and enable flexible control circuit designs.
• Robust Construction: Built to withstand demanding industrial conditions, ensuring a long operational life and minimizing downtime.
• Easy Installation: Screw terminals provide a secure and straightforward connection, simplifying wiring and reducing installation time.
• Compact Design: The S0 size optimizes space utilization within control cabinets, allowing for more efficient panel layouts.
• Safety & Compliance: Adherence to IEC standards guarantees a high level of safety and compatibility with global industrial regulations.

Function

The Siemens 3RT2326-1AB00 Contactor primarily functions as a remotely operated switch for electrical circuits, specifically for AC-1 rated loads.

• Four-Pole Switching: Capable of making and breaking four independent electrical connections simultaneously, ideal for three-phase circuits with a neutral or for specific two-phase applications.
• Load Disconnection: Effectively disconnects weak or non-inductive loads, or power generation plants from the grid, contributing to safe maintenance and operational flexibility.
• Transfer Switching: Can be utilized in transfer switching applications, enabling the seamless transition between different power sources or loads.
• Control Circuit Integration: The auxiliary contacts provide crucial feedback to control systems, indicating the contactor’s status (open or closed), which is essential for interlocking, signaling, and automation sequences.

Technical Details & Protection Information

Protection of Device Connections: All connections, including main, auxiliary, and control supply voltage, must be adequately protected against overload and short circuits.

• Main Connections: Refer to the technical product data sheet for specific protection guidelines for a free-standing contactor. For combinations with overload relays or circuit breakers (motor feeders), consult the Digital Configuration Manual for load feeders or the Configuration Manual for load feeders.
• Auxiliary Connections: Detailed protection information for auxiliary contacts is available in the technical product data sheet.
• Control Supply Voltage: Protection for control circuits should align with relevant standards for control panel configuration, considering cable dimensioning and load characteristics (inrush current, switch-on/holding power). Suitable power supplies with current-limiting functions and appropriate protection devices (e.g., miniature or circuit breakers) are recommended. Refer to the “Control panel tip – Selecting and dimensioning suitable power supplies quickly and reliably” for further recommendations.

Overvoltage Protection (Control Supply Voltage): The 3RT23 contactors (like the 3RT2326-1AB00) can be retrofitted with external surge suppressors (RC elements, varistors, diodes, or diode assemblies) to dampen opening surges in the coil. These accessories must be ordered separately. Note that damping increases the break times of the contactor and the delay times of auxiliary contacts.

Connection Methods:

• Main Circuit: For 3RT231 and 3RT232 contactors, screw or spring-loaded terminals are available. This 3RT2326-1AB00 features screw terminals.
• Auxiliary and Control Circuit: Both auxiliary and control circuits utilize convenient screw terminals for secure connections.

Electromagnetic Compatibility (EMC): The 3RT2326-1AB00 fulfills the requirements for environment category A, ensuring reliable operation in industrial electromagnetic environments. When used with frequency converters, specific configuration notes in the Equipment Manual must be observed.

Contact Reliability of Auxiliary Contacts: The auxiliary contacts of 3RT contactors, including this model, guarantee high contact reliability, especially suitable for switching low voltages ($\le$ 110 V) and low currents ($\le$ 100 mA), and for solid-state circuits with currents $\ge$ 1 mA at voltages of 17 V and higher.

Motor Protection: While the 3RT2326-1AB00 is an AC-1 contactor, for applications requiring motor overload protection, Siemens 3RU2 thermal overload relays or 3RB3 electronic overload relays can be directly mounted onto 3RT23 contactors.

Operating Mechanism: This contactor features a conventional AC operating mechanism, controlled via the A1-A2 control supply voltage connections. Refer to the technical product data sheet for specific operating ranges.

Maintenance and Expandability:

• Solenoid Coil Replacement: The solenoid coil of the 3RT2326-1AB00 can be replaced, extending the lifespan of the contactor.
• Auxiliary Contact Configuration: The 3RT2326-1AB00 (a 3RT232 model) comes with two integrated auxiliary contacts (1 NO + 1 NC). The basic unit can be further expanded using additional auxiliary switches, provided the permissible configuration is observed. Refer to “Auxiliary switches, instantaneous → Overview” for detailed information.

Accessories and Spare Parts: A wide range of accessories and spare parts are available for SIRIUS 3RT2 contactors and 3RH2 contactor relays. For specific ordering data, consult the “Accessories and spare parts for SIRIUS 3RT2 contactors and SIRIUS 3RH2 contactor relays” section.

Application

The Siemens SIRIUS 3RT2326-1AB00 Contactor is ideal for:

• Four-pole switching of weak or non-inductive loads (AC-1): Perfect for resistive loads, heating elements, lighting circuits, and other applications where the load current is primarily resistive.
• Disconnecting loads or power generation plants from the grid: Essential for safety and maintenance procedures in various electrical installations.
• Transfer switching: Facilitates the transition between different power sources or loads in automated systems.

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