Siemens 3RT2326-1AC20 Contactor 40A, 4-Pole AC-1, 24V AC Coil, S0 Size Original Brand New

Siemens 3RT2326-1AC20 Contactor: Reliable 4-Pole Switching for AC-1 Loads

The Siemens 3RT2326-1AC20 is a high-performance 4-pole contactor designed for efficient switching of AC-1 (resistive or slightly inductive) loads up to 40 Amperes at 400V (at 40 °C). Featuring a 24V AC 50/60 Hz coil, integrated 1 normally open (NO) and 1 normally closed (NC) auxiliary contacts, and robust screw terminals, this Size S0 contactor is an essential component for various industrial automation and power control applications.

Overview

The Siemens SIRIUS 3RT23 contactor series is renowned for its compact design, high reliability, and versatility. The 3RT2326-1AC20 is specifically engineered to meet the demands of applications requiring four-pole switching of non-inductive or weakly inductive loads, such as heating elements, lighting systems, or isolation from the grid. Its adherence to international standards like IEC 60947 ensures dependable performance and seamless integration into existing control systems.

Key Benefit

• Optimized for AC-1 Loads: Perfectly suited for switching resistive loads, ensuring long service life and stable operation.
• Reliable Performance: Built to Siemens’ exacting quality standards, guaranteeing consistent and durable operation in demanding industrial environments.
• Integrated Auxiliary Contacts: The built-in 1 NO + 1 NC auxiliary contacts provide immediate feedback and control capabilities, simplifying wiring and reducing the need for external components.
• Flexible Connectivity: Screw terminals offer secure and straightforward wiring for both main and auxiliary circuits.
• Compact Design (Size S0): Saves valuable panel space, allowing for more efficient cabinet layouts.
• Easy Maintenance: Replaceable solenoid coils for 3RT233 contactors (check specific model compatibility for 3RT2326-1AC20) and a wide range of accessories for enhanced functionality and protection.
• Standards Compliant: Meets critical international standards including IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1, ensuring safety and compatibility.

Function

• Four-Pole Switching: Capable of switching four separate circuits or phases simultaneously, ideal for multi-phase resistive loads or for isolating equipment from the main grid.
• Load Disconnection: Effectively disconnects loads or power generation plants from the electrical grid.
• Transfer Switching: Can be utilized in basic transfer switching applications.
• Control Circuit Integration: Auxiliary contacts provide signals for control circuits, enabling interlocking, status indication, and more complex automation logic.
• Overload Protection (with Accessories): Designed to integrate seamlessly with Siemens 3RU2 thermal overload relays or 3RB3 electronic overload relays for comprehensive motor and load protection.
• Surge Suppression (with Accessories): Can be retrofitted with RC elements, varistors, or diode assemblies to damp opening surges in the coil, protecting sensitive control components.

Protection and Connectivity:

• Short-Circuit and Overload Protection: Main and auxiliary connections require suitable protection. Refer to the technical product data sheet for specific information on free-standing contactor protection, and to Siemens configuration manuals for device combinations (contactor with overload relay or circuit breaker).
• Control Supply Voltage Protection: Consider relevant standards for control panel configuration, suitable power supply selection with current-limiting functions, and appropriate protection devices like miniature or circuit breakers.
• Overvoltage Protection: 3RT23 contactors can be retrofitted with surge suppressors (RC elements, varistors, diodes) for coil damping (ordered separately).
• Connection Methods:
  • Main Circuit: Screw terminals (box terminal on 3RT233/3RT234 for direct connection with cable lugs).
  • Auxiliary and Control Circuit: Screw terminals.

Contact Reliability:

• For switching low voltages (≤ 110 V) and currents (≤ 100 mA), the auxiliary contacts of 3RT contactors are designed for high contact reliability, especially suitable for solid-state circuits with currents ≥ 1 mA at 17 V and higher.

Operating Mechanism:

• Features a conventional AC operating mechanism.

Expandability and Accessories:

• Auxiliary Switches: The basic unit of 3RT232 contactors includes two integrated auxiliary contacts (1 NO + 1 NC). All basic units can be expanded with additional auxiliary switches, adhering to permissible configurations.
• Accessories: A wide range of accessories and spare parts are available for SIRIUS 3RT2 contactors, including surge suppressors, overload relays, and additional auxiliary switches, allowing for customized solutions and extended functionality.

For more information on device combinations, detailed protection guidelines, and accessory options, please refer to the Siemens Digital Configuration Manual for load feeders and the Equipment Manuals.

Application

The Siemens 3RT2326-1AC20 contactor is ideal for a broad range of applications, including:

• Industrial Heating Systems: Switching resistive heaters.
• Lighting Control: Managing high-power lighting circuits.
• Capacitor Switching: For power factor correction (ensure proper sizing for inrush currents).
• Isolation Applications: Disconnecting equipment or power sources from the grid.
• General Purpose AC-1 Switching: Any application involving non-inductive or slightly inductive loads.

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