Siemens 3RT2326-1BM40 SIRIUS Contactor AC-1, 40A, 4-Pole, 220V DC, S0 Size Original Brand New

Overview

The Siemens 3RT2326-1BM40 is a high-performance SIRIUS contactor designed for robust industrial applications, primarily for switching of non-inductive or weakly inductive loads (AC-1 category). This 4-pole contactor boasts a 40 A rating at 400 V and 40 °C, ensuring reliable operation in demanding environments. Featuring a 220 V DC control supply voltage, it offers versatile integration into various control systems. The integrated 1 NO + 1 NC auxiliary contacts provide essential feedback and control capabilities, while its secure screw terminals and compact S0 size make installation straightforward. Built to IEC standards, the 3RT2326-1BM40 exemplifies Siemens’ commitment to quality, safety, and efficiency in industrial automation.

Key Function

• Four-pole Switching: Designed for switching four separate circuits simultaneously, making it ideal for multi-phase systems or complex load configurations.
• AC-1 Load Control: Specifically optimized for switching non-inductive or weakly inductive loads, such as resistance furnaces, heaters, or distribution circuits.
• Grid Disconnection: Capable of safely disconnecting loads or power generation plants from the electrical grid.
• Transfer Switching: Suitable for applications requiring the transfer between different power sources or loads.
• Auxiliary Contact Integration: The built-in 1 normally open (NO) and 1 normally closed (NC) auxiliary contacts provide critical signaling for control circuits, enabling interlocking, status indication, and advanced automation.

Benefit

• Reliable Performance: Rated for 40 A (AC-1) at 400 V / 40 °C, ensuring stable and consistent operation in industrial settings.
• Enhanced Safety: Complies with international standards like IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1, guaranteeing a high level of operational safety.
• Versatile Control: The 220 V DC coil offers flexibility for integration into various DC control systems.
• Easy Installation: Features secure screw terminals for main and auxiliary circuits, along with a compact S0 size, simplifying mounting and wiring.
• Durability and Longevity: Built with high-quality materials and robust design, contributing to a longer service life and reduced maintenance.
• Expandability: Can be expanded with additional auxiliary switches, allowing for customization and adaptation to evolving application needs.
• Comprehensive Protection Guidelines: Detailed information on short-circuit, overload, and overvoltage protection ensures proper system design and enhanced equipment safety.
• High Contact Reliability: Auxiliary contacts are designed for reliable switching even at low voltages and currents, making them suitable for sensitive solid-state circuits.

Standards & Protection:

The Siemens 3RT2326-1BM40 adheres to stringent international standards, including IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1 (for auxiliary switches), ensuring global applicability and safety. Proper protection of all connections is paramount. The product’s comprehensive documentation provides guidelines for:

• Short-circuit and Overload Protection: Detailed information for free-standing contactors, contactor-overload relay combinations, and motor feeders (via Digital/Configuration Manuals). Auxiliary and control circuit protection guidelines are also provided.
• Overvoltage Protection: The 3RT23 series can be retrofitted with surge suppressors (RC elements, varistors, diodes) to dampen opening surges in the coil, protecting sensitive control components. (Note: Damping may influence break and delay times.)

Connection Methods:

• Main Circuit: Utilizes reliable screw terminals for secure cable connections.
• Auxiliary and Control Circuit: Equipped with standard screw terminals for straightforward wiring.

Electromagnetic Compatibility (EMC):

This contactor meets the requirements for environment category A, ensuring reliable operation in industrial environments with potentially higher electromagnetic interference. For applications involving frequency converters, specific configuration notes in the Equipment Manual must be observed.

Contact Reliability of Auxiliary Contacts:

The auxiliary contacts of the 3RT23 contactors offer high contact reliability, particularly suitable for switching low voltages (≤ 110 V) and currents (≤ 100 mA). They are also ideal for solid-state circuits with currents ≥ 1 mA at voltages of 17 V and higher.

Motor Protection Compatibility:

For comprehensive motor protection, the 3RT23 contactors are compatible with Siemens 3RU2 thermal overload relays or 3RB3 electronic overload relays, which can be directly mounted for integrated protection against overload.

Operating Mechanism & Coil Replacement:

The 3RT2326-1BM40 features a conventional DC operating mechanism. The solenoid coil can be replaced if needed, enhancing serviceability.

Auxiliary Contact Configuration & Expansion:

The 3RT2326-1BM40 (being a 3RT232 series) comes with two integrated auxiliary contacts (1 NO + 1 NC). All basic units can be expanded with additional auxiliary switches, offering flexibility for complex control requirements.

Accessories & Spare Parts:

A wide range of accessories and spare parts are available for the SIRIUS 3RT2 contactors, including surge suppressors, auxiliary switches, and various connection components, ensuring long-term operational support and system adaptability.

Application

The Siemens 3RT2326-1BM40 contactor is an excellent choice for:

• Four-pole switching of weak or non-inductive loads (AC-1)
• Disconnecting loads or power generation plants from the grid
• Transfer switching applications
• General industrial control circuits and automation systems.

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