Siemens 3RT2346-1AL20 Power Contactor, AC-1, 140A, 4-Pole, 230V AC Coil, S3 Size, Screw Terminal Original Brand New

Siemens 3RT2346-1AL20 SIRIUS Power Contactor | AC-1, 140A, 4-Pole, 230V AC

The Siemens 3RT2346-1AL20 is a high-performance SIRIUS power contactor designed for reliable switching of non-inductive or weakly inductive loads (AC-1) up to 140 Amperes. Part of the robust SIRIUS 3RT2 series, this 4-pole contactor is engineered for demanding industrial control applications, offering exceptional durability and performance. With a 230V AC (50/60 Hz) operating mechanism and convenient screw terminals, it provides a dependable solution for various power switching requirements.

Overview

The Siemens 3RT2346-1AL20 is a Size S3 AC-1 contactor, meticulously designed to meet stringent international standards like IEC 60947. It comes equipped with 1 normally open (NO) and 1 normally closed (NC) integrated auxiliary contacts, providing essential feedback and control options. Its robust construction and versatile features make it an ideal component for a wide range of industrial power distribution and control systems.

Key Features & Benefit

• High Current Capacity: Rated for 140A (at 400V / 40 °C) for AC-1 applications, ensuring efficient handling of significant non-inductive loads.
• 4-Pole Design: Provides comprehensive switching capabilities for multi-phase or complex load circuits.
• Versatile Coil Voltage: Operates with a standard 230V AC (50/60 Hz) control supply, simplifying integration into existing electrical systems.
• Integrated Auxiliary Contacts: Features 1 NO + 1 NC auxiliary contacts for seamless interlocking, signaling, and control circuit integration.
• Robust Screw Terminals: Ensures secure and reliable electrical connections for main and auxiliary circuits.
• Compact Size S3: Optimized dimensions for efficient use of space within control cabinets.
• High Reliability: Manufactured to Siemens’ exacting quality standards, guaranteeing long-term operational stability and safety.
• Modular Expandability: Supports the addition of further auxiliary switches and accessories (sold separately) for enhanced functionality.
• Standards Compliance: Adheres to critical international standards including IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1, ensuring global compatibility and safety.

Function

• Four-Pole Switching: Designed specifically for switching weak or non-inductive loads (AC-1), making it suitable for heating, lighting, and general power distribution.
• Load Disconnection: Effectively disconnects loads or power generation plants from the electrical grid.
• Transfer Switching: Can be utilized in transfer switching applications for power source management.
• Control Circuit Integration: Auxiliary contacts enable interlocking, status indication, and integration into complex control logic.
• Protection Integration: Easily combinable with Siemens 3RU2 thermal overload relays or 3RB3 electronic overload relays for comprehensive motor and circuit protection (when used in relevant applications, e.g., in conjunction with AC-3 versions).

Standards & Protection:

The Siemens 3RT2346-1AL20 contactor complies with:

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

Protection Recommendations:

• Main Connections: Requires suitable short-circuit and overload protection. Refer to the technical product data sheet and digital/configuration manuals for load feeders for specific recommendations, especially when combined with overload relays or circuit breakers.
• Auxiliary Connections: Short-circuit and overload protection is crucial. Consult the technical product data sheet for detailed guidance.
• Control Supply Voltage: Protection should consider relevant standards for control panel configuration, cable dimensioning, and load characteristics (inrush/holding currents). Current-limiting power supplies or miniature/circuit breakers are recommended.
• Overvoltage Protection: The 3RT23 contactors (without pre-fitted coil circuits) can be retrofitted with RC elements, varistors, diodes, or diode assemblies (ordered separately) to suppress opening surges in the coil. Note that damping increases break and delay times.

Connection Methods:

• Main Circuit (3RT234 Contactor): Screw terminals with box terminal. Direct connection to the connecting bar is possible with cable lugs when the box terminal is removed.
• Auxiliary and Control Circuit: Screw terminals for secure and straightforward wiring.

Electromagnetic Compatibility (EMC):

The contactors meet the requirements for environment category A. For applications involving frequency converters, specific configuration notes in the Equipment Manual must be observed.

Contact Reliability of Auxiliary Contacts:

Designed for high contact reliability, especially when switching low voltages (≤ 110 V) and currents (≤ 100 mA). Ideal for solid-state circuits with currents ≥ 1 mA at voltages of 17 V and higher.

Motor Protection:

For overload protection in motor applications (though this specific model is AC-1, suitable for non-inductive loads), 3RU2 thermal overload relays or 3RB3 electronic overload relays can be mounted onto 3RT23 contactors (compatible versions of 3RT23 for AC-3 switching are available separately).

Operating Mechanism:

This 3RT23 contactor features a conventional AC operating mechanism, controlled via the A1-A2 control supply voltage connection with varying operating ranges.

Maintenance & Expandability:

• Solenoid Coil Replacement: Possible for this model.
• Auxiliary Contact Expansion: The basic unit includes two integrated auxiliary contacts (1 NO + 1 NC). Additional auxiliary switches can be mounted to expand functionality, adhering to permissible configurations. Refer to the accessories section for compatible auxiliary switches.

Accessories & Spare Parts:

A wide range of accessories and spare parts are available to enhance functionality and ensure long-term operation. These include:

• Surge suppressors (RC elements, varistors, diodes)
• Additional auxiliary switches
• Bus connectors
• And more.

For a complete list of compatible accessories and spare parts, please refer to the “Accessories and spare parts for SIRIUS 3RT2 contactors” documentation or contact Turll support.

Application

The Siemens 3RT2346-1AL20 contactor is ideally suited for:

• Switching resistive loads in industrial heating systems.
• Controlling lighting circuits in commercial and industrial buildings.
• Power distribution in non-motorized applications.
• Disconnecting power sources in renewable energy systems.
• General purpose AC-1 switching where reliable, high-current switching of non-inductive loads is required.

For more of our high-quality industrial automation products, please visit Turll.