Siemens 3RT2344-1NF30 SIRIUS Contactor S3, AC-1, 110A, 4-Pole, 83-155V AC/DC with Varistor Original Brand New

Overview

The Siemens SIRIUS 3RT2344-1NF30 is a robust and versatile 4-pole contactor designed for switching weak or non-inductive loads (AC-1) up to 110A at 400V (at 40°C). Part of the trusted SIRIUS 3RT2 series, this Size S3 contactor is engineered for reliability and efficiency in industrial applications. It features a wide-range solid-state operating mechanism accepting 83-155V AC/DC control voltage (50/60 Hz) and comes with an integrated varistor for surge suppression, protecting the coil and enhancing system longevity. The integrated 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contacts, along with secure screw terminals, provide flexible integration into control circuits.

Key Features & Function

• AC-1 Duty: Specifically designed for switching non-inductive or slightly inductive loads, such as resistance furnaces, heaters, or distribution circuits.
• High Current Rating: Handles up to 110 A at 400 V / 40 °C, suitable for demanding applications.
• 4-Pole Design: Enables multi-phase switching, ideal for disconnecting loads or power generation plants from the grid, and transfer switching applications.
• Wide-Range Control Voltage: Flexible operation with a control supply voltage of 83-155 V AC/DC (50/60 Hz), accommodating various power systems.
• Integrated Varistor: Provides essential surge suppression for the coil, protecting against voltage peaks and extending the contactor’s lifespan.
• Auxiliary Contacts: Equipped with 1 NO + 1 NC integrated auxiliary contacts, offering immediate feedback and control possibilities.
• Screw Terminals: Ensures secure and reliable electrical connections for main, auxiliary, and control circuits.
• Size S3: Compact and standardized size for easy integration into control panels and systems.
• Solid-State Operating Mechanism: Offers reliable and consistent performance, compatible with both AC and DC control signals.
• Standards Compliance: Manufactured and tested according to IEC 60947‑1, IEC 60947‑4‑1, and IEC 60947‑5‑1 (for auxiliary switches), ensuring high quality and safety.

Benefit

• Enhanced Reliability: Integrated varistor protects the coil from overvoltage, reducing downtime and maintenance.
• Versatile Application: Ideal for a wide range of AC-1 switching tasks, including resistive loads, distribution circuits, and power grid disconnection.
• Simplified Wiring: Screw terminals provide straightforward and secure connections.
• Flexible Control: Wide AC/DC control voltage range simplifies system design and integration.
• Space-Saving Design: Compact Size S3 form factor optimizes panel space.
• Globally Compliant: Adherence to international IEC standards ensures compatibility and safety in various industrial environments.
• Comprehensive Protection Options: Designed to integrate seamlessly with Siemens SIRIUS overload relays (3RU2 thermal or 3RB3 electronic) for complete motor protection when used in motor feeder applications.
• Durable Construction: Built for long-term performance in demanding industrial conditions, including electromagnetic compatibility in environment category A.

Technical Specification

• Product Type: Contactor, AC-1
• Manufacturer: Siemens
• Series: SIRIUS 3RT2
• Product Number: 3RT2344-1NF30
• Rated Operational Current (AC-1): 110 A (at 400 V / 40 °C)
• Number of Poles: 4
• Control Supply Voltage: 83-155 V AC/DC, 50/60 Hz
• Coil Damping: Integrated varistor
• Auxiliary Contacts (Integrated): 1 NO (Normally Open) + 1 NC (Normally Closed)
• Terminal Type: Screw Terminal
• Size: S3
• Standards: IEC 60947‑1, IEC 60947‑4‑1, IEC 60947‑5‑1 (auxiliary switches)
• Electromagnetic Compatibility: Environment category A
• Main Circuit Connection: Screw terminals with box terminal (direct connection with cable lugs possible when box terminal removed)
• Auxiliary/Control Circuit Connection: Screw terminals
• Contact Reliability (Auxiliary Contacts): High, suitable for solid-state circuits ($\ge$ 1 mA at $\ge$ 17 V)
• Operating Mechanism Type: Wide-range solid-state operating mechanism (AC or DC operation)
• Solenoid Coil Replacement: Possible
• Applicable Overload Relays: 3RU2 thermal overload relays, 3RB3 electronic overload relays
• Expandability: Expandable with additional auxiliary switches (permissible configuration must be observed)
• Accessories: Compatible with SIRIUS 3RT2 contactor accessories and spare parts (e.g., surge suppressors, auxiliary switches)

Application

The Siemens SIRIUS 3RT2344-1NF30 contactor is ideally suited for:

• Four-pole switching of weak or non-inductive loads (AC-1)
• Disconnecting loads or power generation plants from the grid
• Transfer switching applications
• Resistive heating applications
• Lighting control systems
• General power distribution circuits