Siemens SIRIUS 3RT2344-1NP30 Contactor 4-Pole, AC-1 110A, 175-280V AC/DC, Varistor, S3 Original Brand New

Overview

The Siemens SIRIUS 3RT2344-1NP30 is a high-performance 4-pole contactor from the renowned SIRIUS family, specifically designed for switching non-inductive or weakly inductive loads (AC-1) up to 110 Amperes at 400 V and 40 °C. This versatile contactor features a wide-range solid-state operating mechanism, allowing for flexible control with a supply voltage of 175-280 V AC/DC (50/60 Hz). For enhanced reliability and protection, it comes with an integrated varistor for surge suppression in the coil circuit.

Equipped with 1 normally open (NO) and 1 normally closed (NC) auxiliary contacts and secure screw terminals, the 3RT2344-1NP30 is an ideal solution for applications requiring reliable load disconnection, transfer switching, or control in industrial environments. Its robust S3 size ensures durability and compatibility within various control panel setups.

Benefit

• Versatile AC/DC Control: Wide-range solid-state operating mechanism (175-280 V AC/DC) provides flexibility and reduces inventory complexity.
• Enhanced Coil Protection: Integrated varistor effectively dampens opening surges in the coil, increasing contactor lifespan and system reliability.
• High Current Capacity: Rated for 110 A AC-1 at 400 V / 40 °C, suitable for demanding non-inductive load applications.
• Integrated Auxiliary Contacts: Includes 1 NO + 1 NC auxiliary contacts for seamless integration into control circuits and signaling.
• Robust & Reliable Connections: Secure screw terminals for both main and auxiliary circuits ensure dependable electrical connections.
• Space-Saving Design: Compact Size S3 form factor optimizes panel space.
• Compliance with Standards: Designed and manufactured to meet international standards such as IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1, ensuring safety and performance.
• Expandable Functionality: Supports additional auxiliary switches and integration with Siemens 3RU2 thermal or 3RB3 electronic overload relays for comprehensive motor protection.

Function

The Siemens 3RT2344-1NP30 Contactor performs the following key functions:

• Four-Pole Switching of AC-1 Loads: Efficiently switches four circuits of non-inductive or weakly inductive loads, such as resistance furnaces, heaters, or distribution circuits.
• Load Disconnection: Provides a reliable means to disconnect electrical loads or power generation plants from the grid.
• Transfer Switching: Can be utilized in transfer switching applications for power sources.
• Control Circuit Integration: Auxiliary contacts (1 NO + 1 NC) allow for direct integration into control circuits for status indication or interlocking.
• Overvoltage Protection (Integrated Varistor): The built-in varistor protects the operating mechanism coil from damaging voltage spikes and surges, ensuring long-term operational stability.

Standards & Protection

• Compliance: Meets stringent international standards including IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1 (for auxiliary switches), ensuring high quality and reliability.
• Short-Circuit and Overload Protection of Main Connections: Requires external protection measures. 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.
• Short-Circuit and Overload Protection of Auxiliary Connections: Refer to the technical product data sheet for specific information.
• Short-Circuit and Overload Protection of Control Supply Voltage: Proper cable dimensioning and suitable power supply with current-limiting functions are recommended, considering the contactor’s load characteristics (inrush and holding power).
• Overvoltage Protection at Control Supply Voltage Connection: Integrated varistor provides effective damping of opening surges. For 3RT23 contactors without integrated damping, external surge suppressors (RC elements, varistors, diodes) can be retrofitted.

Connection Methods

• Main Circuit: Screw terminals with box terminals. Direct connection with cable lugs is possible by removing the box terminal.
• Auxiliary and Control Circuit: Screw terminals provide reliable and secure connections.

Electromagnetic Compatibility (EMC)

• The contactors fulfill the requirements for environment category A.
• Note: When used with frequency converters, specific configuration notes in the Equipment Manual must be observed for optimal performance and EMC compliance.

Contact Reliability of Auxiliary Contacts

• Siemens 3RT23 contactor auxiliary contacts are engineered for high contact reliability, especially for switching low voltages (≤ 110 V) and currents (≤ 100 mA).
• They are particularly well-suited for solid-state circuits with currents ≥ 1 mA at voltages of 17 V and higher.

Motor Protection

• For comprehensive overload protection, the Siemens 3RT2344-1NP30 contactor can be directly combined with Siemens 3RU2 thermal overload relays or 3RB3 electronic overload relays.

Operating Mechanism Types

• Features a wide-range solid-state operating mechanism that supports both AC and DC control (175-280 V AC/DC).
• Control is via the A1-A2 control supply voltage connection.

Maintenance & Expansion

• Solenoid Coil Replacement: The solenoid coil of the 3RT2344-1NP30 can be replaced, extending the contactor’s service life.
• Auxiliary Contact Expansion: 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 → Overview” for permissible configurations.

Accessories and Spare Parts

A wide range of accessories and spare parts are available to enhance functionality and simplify maintenance for SIRIUS 3RT2 contactors and 3RH2 contactor relays. Please refer to the dedicated accessory and spare part listings for compatible options.

Application

The Siemens SIRIUS 3RT2344-1NP30 contactor is ideal for a variety of industrial applications, including:

• Four-pole switching of weak or non-inductive loads (AC-1): Perfect for resistive heating elements, lighting circuits, and power distribution systems.
• Disconnecting loads or power generation plants from the grid: Ensures safe isolation for maintenance or emergency situations.
• Transfer switching: Facilitates switching between different power sources.

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