Siemens SIRIUS 3RT2326-2BB40 Contactor 40A AC-1, 4-Pole, 24V DC Coil, Spring-Loaded Terminals, S0 Size Original Brand New

Overview

The Siemens SIRIUS 3RT2326-2BB40 is a high-performance 4-pole contactor designed for reliable switching of weak or non-inductive loads (AC-1 applications). Engineered with precision and built to meet rigorous industrial standards, this contactor offers robust performance for a wide range of electrical control and automation tasks. Featuring a 24V DC coil for efficient operation, integrated 1 NO + 1 NC auxiliary contacts, and convenient spring-loaded terminals, the 3RT2326-2BB40 provides both versatility and ease of installation in space-saving Size S0.

Benefit

• Reliable Performance: Designed for consistent and safe switching of non-inductive loads, ensuring operational stability.
• Efficient DC Operation: The 24V DC coil offers efficient and precise control, suitable for various industrial control circuits.
• Space-Saving Design: Its compact S0 size allows for efficient panel layout and optimized use of space.
• Quick & Easy Wiring: Spring-loaded terminals facilitate fast, secure, and tool-free wiring, reducing installation time and potential errors.
• Integrated Auxiliary Contacts: The built-in 1 NO + 1 NC auxiliary contacts provide immediate feedback and control possibilities without the need for additional modules.
• High Contact Reliability: Especially suitable for low-voltage and low-current circuits (e.g., solid-state circuits), guaranteeing dependable switching.
• Standards Compliant: Meets international standards including IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1, ensuring safety and compatibility.
• Expandable: Can be expanded with additional auxiliary switches (sold separately) for increased control flexibility.

Function

The Siemens 3RT2326-2BB40 contactor serves critical functions in electrical systems:

• Four-Pole Switching: Efficiently switches four separate lines, making it ideal for multi-phase or complex load control.
• Load Disconnection: Used for disconnecting weak or non-inductive loads from the grid, ensuring safety during maintenance or in emergency situations.
• Power Generation Plant Isolation: Enables the isolation of power generation plants from the electrical grid.
• Transfer Switching: Facilitates the seamless transfer of power between different sources or loads.
• Control Circuit Integration: Its auxiliary contacts allow for integration into complex control and interlocking circuits.

Overview of Technical Details & Protection:

Standards: Complies with:

• IEC 60947-1
• IEC 60947-4-1
• IEC 60947-5-1 (for auxiliary switches)

Protection of Device Connections: All connections must be protected against overload and short circuits.

• Short-circuit and overload protection of main connections: Refer to the technical product data sheet for specific information on free-standing contactor protection. For device combinations (contactor with overload relay or circuit breaker), consult the Digital and Configuration Manuals for load feeders.
• Short-circuit and overload protection of auxiliary connections: Details can be found in the technical product data sheet.
• Short-circuit and overload protection of control supply voltage: Consider relevant standards for control panel configuration, suitable power supply selection (with current-limiting function), and load characteristics (inrush current, switch-on, holding power).

Protection against Overvoltage at Control Supply Voltage Connection:

• 3RT23 contactors can be retrofitted with surge suppressors (RC elements, varistors, diodes) to damp opening surges in the coil. These are ordered separately as accessories.
• Note: Damping increases break times, opening delay of NO contacts, and closing delay of NC contacts. Refer to the Equipment Manual for details on damping influence.

Connection Methods:

• Main Circuit (3RT2326-2BB40): Features convenient spring-loaded terminals, including a plug-in design for device connectors.
• Auxiliary and Control Circuit: Utilizes screw terminals for secure connections.

Electromagnetic Compatibility (EMC):

• Fulfills requirements for environment category A.
• Note: For use with frequency converters, observe configuration notes in the Equipment Manual.

Contact Reliability of Auxiliary Contacts:

• Auxiliary contacts of 3RT contactors (like the 3RT2326-2BB40) are designed for high contact reliability, especially when switching voltages $\le$ 110 V and currents $\le$ 100 mA.
• Suitable for solid-state circuits with currents $\ge$ 1 mA at voltages of 17 V and higher.

Motor Protection:

• For overload protection of 3RT23 contactors, 3RU2 thermal overload relays or 3RB3 electronic overload relays can be directly mounted.

Operating Mechanism Types:

• The 3RT2326-2BB40 features a conventional DC operating mechanism. Control is via the A1-A2 control supply voltage connection.

Replacing Components:

• Solenoid coil replacement is possible for the 3RT2326-2BB40.
• Only the contacts for 3RT233 contactors can be replaced (not applicable for 3RT2326-2BB40).

Fitting Auxiliary Contacts and Mounting Additional Auxiliary Switches:

• The 3RT2326-2BB40 (a 3RT232 contactor) includes two integrated auxiliary contacts (1 NO + 1 NC) in its basic unit.
• The basic unit can be expanded with additional auxiliary switches; permissible configurations must be observed. 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 and 3RH2 contactor relays. Please refer to the dedicated accessory catalogs for ordering information.

Application

The Siemens 3RT2326-2BB40 contactor is ideal for a variety of demanding applications, including:

• Switching of non-inductive or weakly inductive loads in industrial and commercial settings.
• Control of heating elements, lighting systems, and capacitor banks (AC-1 applications).
• Integration into control panels for automation and process control.
• Ensuring safe disconnection of electrical loads.
• Transfer switching in power distribution systems.

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