Siemens 3RT2326-1BG40 Contactor 4-Pole AC-1, 40A, 125V DC Coil, S0 Size Original Brand New

Overview

The Siemens 3RT2326-1BG40 is a robust and versatile 4-pole contactor from the SIRIUS 3RT2 series, specifically designed for switching non-inductive or weakly inductive loads (AC-1 applications). Rated for 40 Amperes at 400V / 40 °C, this compact S0 size contactor features a 125V DC control supply voltage. It comes equipped with 1 normally open (NO) and 1 normally closed (NC) integrated auxiliary contacts, providing essential feedback and control capabilities. With convenient screw terminals for all connections, the 3RT2326-1BG40 is a reliable choice for diverse industrial control panel applications, including disconnecting loads, power generation plant integration, and transfer switching.

Key Features & Benefit

• High Performance AC-1 Switching: Ideal for resistive loads, heating elements, and general power distribution applications up to 40A.
• 4-Pole Configuration: Offers versatile switching options for multi-phase or multiple circuit control.
• 125V DC Coil: Suitable for DC control systems, providing stable and reliable operation.
• Integrated Auxiliary Contacts (1 NO + 1 NC): Enhances control functionality and allows for easy integration into interlocking and signaling circuits.
• Screw Terminals: Ensures secure and straightforward wiring, facilitating quick installation and maintenance.
• Compact S0 Size: Space-saving design for efficient panel layout.
• Robust & Reliable: Manufactured by Siemens, a global leader in industrial automation, ensuring high quality and long operational life.
• Standards Compliance: Adheres to essential international standards including IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1, guaranteeing safety and performance.

Function

• Switching Non-Inductive/Weakly Inductive Loads (AC-1): Efficiently makes and breaks circuits for applications such as resistive heaters, lighting, and general power distribution.
• Load Disconnection: Provides a reliable means to disconnect loads or power generation plants from the grid.
• Transfer Switching: Can be utilized in transfer switch applications for power source management.
• Control and Signaling: The integrated auxiliary contacts enable feedback to control systems and activate signaling devices.

Standards & Protection

• Standards: IEC 60947-1, IEC 60947-4-1, IEC 60947-5-1 (auxiliary switches)
• Protection of Device Connections:
  • Main Connections: Requires suitable short-circuit and overload protection. Refer to the technical product data sheet and configuration manuals for detailed guidance on device combinations (e.g., with overload relays or circuit breakers).
  • Auxiliary Connections: Short-circuit and overload protection information available in the technical product data sheet.
  • Control Supply Voltage Connections: Protection measures should adhere to relevant standards for control panels. Consideration of power supply characteristics (current-limiting, inrush current, holding power) and suitable protection devices (e.g., miniature circuit breakers) is crucial.
• Overvoltage Protection (Control Supply Voltage): 3RT23 contactors can be retrofitted with external surge suppressors (RC elements, varistors, diodes) for damping opening surges in the coil. Note that damping increases break and delay times.
• Electromagnetic Compatibility (EMC): Fulfills requirements for environment category A. Observe configuration notes when used with frequency converters.

Connection Methods:

• Main Circuit: Screw terminals (with box terminal or direct connection with cable lugs for 3RT233/3RT234).
• Auxiliary and Control Circuit: Screw terminals.

Contact Reliability of Auxiliary Contacts:

• Designed for high contact reliability, especially suitable for switching low voltages (≤ 110 V) and currents (≤ 100 mA), including solid-state circuits (≥ 1 mA at ≥ 17 V).

Motor Protection (if applicable for future expansions/combinations):

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

Operating Mechanism Types:

• This version features a DC operating mechanism. Other 3RT23 contactors are available with AC or wide-range solid-state operating mechanisms.

Serviceability:

• Solenoid Coil Replacement: Possible for this model.
• Auxiliary Contacts: The basic unit contains two integrated auxiliary contacts (1 NO + 1 NC). Additional auxiliary switches can be fitted for expansion (adhere to permissible configurations).

Accessories & Spare Parts:

• A range of accessories and spare parts are available for SIRIUS 3RT2 contactors to enhance functionality and extend operational life. Please refer to the SIRIUS 3RT2 accessories catalog for details.

Application

The Siemens 3RT2326-1BG40 contactor is ideally suited for applications requiring reliable and robust switching of non-inductive loads, including:

• Heating and lighting circuits
• Resistive loads in industrial processes
• General power distribution panels
• Disconnecting sections of electrical networks
• Transfer switching in power management systems

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