Siemens 3RT2326-2AB00 Contactor 4-Pole, AC-1, 40A, 24V AC Coil, Spring-Loaded (Size S0) Original Brand New

Overview

The Siemens 3RT2326-2AB00 is a high-performance 4-pole contactor from the SIRIUS 3RT2 series, specifically designed for switching non-inductive or weakly inductive loads (AC-1) up to 40 Amperes at 400V / 40 °C. This robust contactor features a 24V AC, 50 Hz coil, providing reliable control in various industrial applications. It comes equipped with 1 normally open (NO) and 1 normally closed (NC) integrated auxiliary contacts, offering enhanced control and feedback capabilities. The convenient spring-loaded terminals ensure fast, secure, and vibration-resistant wiring, making installation and maintenance highly efficient. Its compact Size S0 design makes it suitable for space-conscious control panels.

Benefit

• Reliable Performance: Built to IEC standards, ensuring consistent and safe operation in demanding industrial environments.
• Efficient Wiring: Spring-loaded terminals provide quick, tool-free, and secure connections, reducing installation time and potential wiring errors.
• Versatile Application: Ideal for a wide range of AC-1 applications, including switching heating elements, lighting systems, and power distribution in non-motorized loads.
• Integrated Auxiliary Contacts: The built-in 1 NO + 1 NC contacts offer immediate feedback and control options without needing additional modules.
• Space-Saving Design: The compact Size S0 allows for efficient panel layout, particularly where space is at a premium.
• Enhanced Safety: Designed with provisions for short-circuit, overload, and overvoltage protection, contributing to a safer electrical system.
• Long Service Life: Siemens’ renowned quality and robust construction ensure durability and minimal maintenance.

Function

The Siemens 3RT2326-2AB00 contactor primarily functions as an electrical switch, enabling the remote control and disconnection of circuits. Its key functions include:

• Load Switching: Efficiently opens and closes circuits for non-inductive or weakly inductive loads (AC-1).
• Remote Control: Allows for the control of connected equipment from a distance, enhancing operational flexibility and safety.
• Circuit Isolation: Provides a means to safely disconnect loads or power generation plants from the grid for maintenance or emergency purposes.
• Signaling and Interlocking: The integrated auxiliary contacts provide status feedback (NO) and facilitate interlocking with other control components (NC), crucial for automation and safety circuits.

Overview of Protection and Connection

Protection of Device Connections: All connections, including main, auxiliary, and control supply voltage connections, require appropriate protection against overload and short circuits.

• Short-circuit and overload protection of main connections: Refer to the technical product data sheet for free-standing contactors. For device combinations (contactor with overload relay or circuit breaker), consult the Digital Configuration Manual for load feeders or the Configuration Manual for load feeders.
• Short-circuit and overload protection of auxiliary connections: Information available in the technical product data sheet.
• Short-circuit and overload protection of control supply voltage or supply voltage connections: Adherence to relevant standards for control panel configuration is crucial. Consider power supplies with current-limiting functions and select suitable protection devices like miniature or circuit breakers, taking into account contactor load characteristics (inrush current, switch-on power, holding power).

Protection against overvoltage at the control supply voltage connection: 3RT23 contactors (without coil circuit) can be retrofitted with external surge suppressors (RC elements, varistors, diodes, or diode assemblies) to dampen opening surges in the coil. Note that damping increases break times and opening/closing delay times of contacts.

Connection Methods:

• Main circuit (3RT232 contactors): Spring-loaded terminals with convenient plug-in design for device connector.
• Auxiliary and control circuit: Screw terminals.

Contact Reliability of Auxiliary Contacts

The auxiliary contacts of 3RT contactors are designed for high contact reliability, particularly suitable for switching voltages $\le$ 110 V and currents $\le$ 100 mA. They are also effective in solid-state circuits with currents $\ge$ 1 mA at voltages of 17 V and higher.

Motor Protection

While the 3RT2326-2AB00 is an AC-1 contactor, it can be combined with Siemens 3RU2 thermal overload relays or 3RB3 electronic overload relays for comprehensive motor protection if used in applications involving motor-driven loads (AC-3), although special 3RT23 versions are available for dedicated AC-3 applications.

Operating Mechanism Type

This contactor features a conventional AC operating mechanism, controlled via the A1-A2 control supply voltage connection within specified operating ranges.

Replaceability

The solenoid coil of the 3RT2326-2AB00 is replaceable, extending the lifespan and maintainability of the unit.

Auxiliary Contact Configuration

The 3RT2326-2AB00 basic unit includes two integrated auxiliary contacts (1 NO + 1 NC). All basic units can be further expanded with additional auxiliary switches, provided the permissible configuration is observed. For detailed information, refer to “Auxiliary switches, instantaneous → Overview” in the product documentation.

Accessories and Spare Parts

A wide range of accessories and spare parts are available for SIRIUS 3RT2 contactors and SIRIUS 3RH2 contactor relays, ensuring long-term operational support. Please refer to the relevant accessory and spare part overviews for detailed ordering information.

Application

The Siemens 3RT2326-2AB00 contactor is ideally suited for the following applications:

• Four-pole switching of weak or non-inductive loads (AC-1) in various industrial and commercial settings.
• Disconnecting loads or power generation plants from the electrical grid.
• Use in transfer switching applications.

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