Siemens 3RT2346-1AB00 SIRIUS Power Contactor 4-Pole, 140A (AC-1), 400V, 24V AC Coil, Screw Terminals, Size S3 Original Brand New

Overview

The Siemens 3RT2346-1AB00 is a high-performance SIRIUS power contactor, specifically designed for switching non-inductive or weakly inductive loads (AC-1 utilization category). Part of the renowned SIRIUS 3RT2 series, this robust 4-pole contactor handles current up to 140 A at 400 V (at 40 °C ambient temperature). It features a 24 V AC, 50 Hz control voltage and comes equipped with essential 1 NO (normally open) and 1 NC (normally closed) auxiliary contacts for versatile control circuit integration. Its compact Size S3 design and reliable screw terminals make it an ideal choice for a wide range of industrial power control applications.

Benefit

• Reliable Performance: Engineered to IEC 60947 standards, ensuring dependable operation for AC-1 loads.
• Versatile Application: Ideal for four-pole switching of resistive loads, power generation plants, and transfer switching.
• Enhanced Control: Integrated 1 NO + 1 NC auxiliary contacts offer flexibility for interlocking and signaling.
• Secure Connections: Robust screw terminals provide secure and stable wiring for both main and auxiliary circuits.
• Space-Saving Design: As part of the SIRIUS modular system, it contributes to fast, flexible, and space-efficient control cabinet construction.
• Easy Integration: Compatible with Siemens’ comprehensive range of SIRIUS accessories, including overload relays for complete motor protection.

Function

The Siemens 3RT2346-1AB00 contactor serves as an electromechanical switching device for the primary purpose of:

• Four-pole switching of weak or non-inductive loads (AC-1): This includes applications like heating, lighting, and capacitor banks.
• Disconnecting loads or power generation plants from the grid: Provides a safe and efficient means of isolation.
• Transfer switching: Facilitates the changeover between different power sources or loads.

Overview of Features

• Standards Compliance: Conforms to international standards for low-voltage switchgear and controlgear, ensuring safety and performance.
• Protection of Device Connections: Requires appropriate short-circuit, overload, and overvoltage protection for main, auxiliary, and control supply voltage connections. Refer to technical data sheets and configuration manuals for detailed guidance on protection measures, including the use of suitable power supplies with current-limiting functions and miniature or circuit breakers.
• Overvoltage Protection (Control Supply): 3RT23 contactors can be retrofitted with surge suppressors (RC elements, varistors, diodes, or diode assemblies) to dampen opening surges in the coil. Note that damping increases break and delay times.
• Connection Methods:
  • Main Circuit: Features screw terminals with box terminals. Direct connection to connecting bars with cable lugs is possible when the box terminal is removed.
  • Auxiliary and Control Circuit: Equipped with reliable screw terminals.
• Contact Reliability of Auxiliary Contacts: Designed for high contact reliability, especially suitable for switching low voltages (≤ 110 V) and currents (≤ 100 mA), making them ideal for solid-state circuits (≥ 1 mA at ≥ 17 V).
• Motor Protection Integration: Can be easily combined with SIRIUS 3RU2 thermal overload relays or 3RB3 electronic overload relays for comprehensive motor protection against overload and phase failure.
• Operating Mechanism: Utilizes a conventional AC operating mechanism, controlled via terminals A1-A2.
• Solenoid Coil Replacement: The solenoid coil can be replaced for ease of maintenance.
• Auxiliary Contact Expansion: Basic units can be expanded with additional auxiliary switches, adhering to permissible configurations. The 3RT2346-1AB00 (3RT234 contactor) comes with two integrated auxiliary contacts (1 NO + 1 NC).
• Accessories and Spare Parts: A wide range of accessories and spare parts are available for the SIRIUS 3RT2 contactors to enhance functionality and simplify maintenance.

Application

• Resistive heating systems
• Lighting circuits
• Capacitor switching
• Isolation of power generation units
• Automatic transfer switches (ATS) for power redundancy

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