Siemens 3RT2346-1NB30 Contactor 4-Pole AC-1, 140A, 20-33V AC/DC, Integrated Varistor Original Brand New

Overview

The Siemens 3RT2346-1NB30 is a high-performance 4-pole contactor designed for reliable switching of non-inductive or weakly inductive loads (AC-1) up to 140 A at 400 V and 40 °C. Part of the SIRIUS 3RT2 series, this robust size S3 contactor features a versatile 20-33 V AC/DC control supply voltage with 50/60 Hz compatibility and an integrated varistor for enhanced surge protection. Equipped with one normally open (NO) and one normally closed (NC) auxiliary contact, and secure screw terminals for main and auxiliary circuits, the 3RT2346-1NB30 ensures efficient and safe operation in diverse industrial applications. It adheres to stringent international standards including IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1.

Key Features & Function

• 4-Pole AC-1 Switching: Specifically designed for switching of non-inductive or weakly inductive loads, making it ideal for heating, lighting, or resistive load applications.
• High Current Rating: Handles up to 140 Amperes (AC-1) at 400 V and 40 °C, ensuring robust performance for demanding loads.
• Wide Control Voltage Range: Operates reliably with a flexible 20-33 V AC/DC control supply voltage (50/60 Hz), offering broad compatibility for control systems.
• Integrated Varistor: Provides built-in surge suppression for the coil, enhancing the lifespan of the contactor and protecting sensitive control circuitry from voltage spikes.
• Auxiliary Contacts (1 NO + 1 NC): Includes one normally open and one normally closed auxiliary contact for signaling, interlocking, and complex control circuit integration.
• Screw Terminals: Ensures secure and reliable electrical connections for both main and auxiliary circuits, facilitating easy installation and maintenance.
• Compact Size S3: Optimized for space-saving installation within control panels while maintaining high current capacity.
• Standards Compliance: Meets global safety and performance standards (IEC 60947-1, IEC 60947-4-1, IEC 60947-5-1), guaranteeing reliability and compliance for international projects.
• Electromagnetic Compatibility (EMC): Fulfills requirements for environment category A, ensuring minimal electromagnetic interference.
• High Contact Reliability: Auxiliary contacts are suitable for low voltages (≤ 110 V) and currents (≤ 100 mA), and especially effective for solid-state circuits (≥ 1 mA at 17 V and higher).

Benefit

• Enhanced System Protection: Integrated varistor and robust design protect the contactor and connected equipment from overvoltage and short circuits.
• Versatile Application: Ideal for disconnecting loads or power generation plants from the grid, transfer switching, and general 4-pole AC-1 switching applications.
• Reliable Performance: Built to Siemens’ high-quality standards, ensuring long-term operational stability and reduced downtime.
• Flexible Integration: Wide control voltage range and auxiliary contacts allow for seamless integration into various control systems.
• Easy Installation: Screw terminals simplify wiring and provide a secure connection, reducing installation time.
• Cost-Effective: Durable design and integrated protection reduce the need for external components, offering a cost-efficient solution over its lifecycle.
• Global Acceptance: Compliance with international standards makes it suitable for use in diverse markets and applications worldwide.

Protection of Connections:

• Main Connections: Requires suitable short-circuit and overload protection. Refer to the technical product data sheet for free-standing contactors or the Digital/Configuration Manual for load feeders with overload relays or circuit breakers.
• Auxiliary Connections: Refer to the technical product data sheet for specific protection guidelines.
• Control Supply Voltage: Protection should consider relevant standards for control panel configuration, load characteristics (inrush, switch-on, holding power), and potential current-limiting power supplies or miniature/circuit breakers.

Connection Methods:

• Main Circuit: Screw terminals with box terminal. Direct connection with cable lugs is possible after removing the box terminal.
• Auxiliary and Control Circuit: Secure screw terminals.

Motor Protection: For overload protection, this 3RT23 contactor is compatible with 3RU2 thermal overload relays or 3RB3 electronic overload relays, which can be directly mounted.

Operating Mechanism: Features a wide-range solid-state operating mechanism compatible with both AC and DC control (20-33 V AC/DC).

Maintenance & Expansion: The solenoid coil can be replaced. The basic unit comes with two integrated auxiliary contacts (1 NO + 1 NC) and can be further expanded with additional auxiliary switches (refer to “Auxiliary switches, instantaneous” for details).

Accessories & Spare Parts: A wide range of accessories and spare parts are available for SIRIUS 3RT2 contactors, including surge suppressors (RC elements, varistors, diodes) for enhanced coil damping if needed.

Application

The Siemens 3RT2346-1NB30 contactor is ideal for:

• Four-pole switching of weak or non-inductive loads (AC-1)
• Disconnecting loads or power generation plants from the grid
• Transfer switching
• Industrial control systems
• Building automation
• Heating, ventilation, and air conditioning (HVAC) systems
• Lighting control

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