Siemens 3RT2346-1AC20 Contactor 140A AC-1, 4-Pole, 24V AC, S3 Screw Terminal Original Brand New

Overview

The Siemens 3RT2346-1AC20 is a high-performance 4-pole power contactor, part of the SIRIUS 3RT2 series, designed for reliable switching of AC-1 (non-inductive or weakly inductive) loads up to 140 A at 400 V and 40 °C. Featuring a 24 V AC (50/60 Hz) coil, this Size S3 contactor comes equipped with 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contact, providing versatile control options. Its robust screw terminals ensure secure and straightforward wiring. Manufactured to stringent IEC standards, the 3RT2346-1AC20 is an ideal solution for disconnecting loads, power generation plants from the grid, and transfer switching in various industrial and commercial environments.

Key Features & Benefit

• High Current Capacity: Rated for 140 A (AC-1) at 400 V / 40 °C, making it suitable for demanding non-inductive load applications.
• 4-Pole Design: Enables multi-phase switching for enhanced control and isolation.
• Versatile Control: Operates with a standard 24 V AC (50/60 Hz) control supply voltage.
• Integrated Auxiliary Contacts: Includes 1 NO + 1 NC auxiliary contacts for seamless integration into control circuits and signaling.
• Robust Screw Terminals: Ensures reliable and easy electrical connections for both main and auxiliary circuits.
• Compact Size S3: Optimized dimensions for efficient panel space utilization.
• Compliance with Standards: Meets IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1 (auxiliary switches) for global applicability and safety.
• Enhanced Contact Reliability: Auxiliary contacts are designed for high reliability, even with low voltages ($\le$ 110 V) and currents ($\le$ 100 mA), making them suitable for solid-state circuits.
• Expandable Functionality: Can be expanded with additional auxiliary switches for increased control flexibility.
• Overvoltage Protection Ready: Can be retrofitted with surge suppressors (RC elements, varistors, diodes) to protect the coil against opening surges.

Function

• Four-pole switching of weak or non-inductive loads (AC-1): Ideal for resistive heaters, lighting, and distribution circuits.
• Disconnecting loads or power generation plants from the grid: Provides a safe and effective means of isolation.
• Transfer switching: Facilitates switching between different power sources or loads.
• Control and Signaling: Integrated auxiliary contacts allow for feedback and control in automated systems.

Protection & Safety:

• Short-circuit and overload protection of main connections: Refer to the technical product data sheet for free-standing contactors or digital configuration manuals for device combinations with overload relays or circuit breakers.
• Short-circuit and overload protection of auxiliary connections: Information available in the technical product data sheet.
• Short-circuit and overload protection of control supply voltage: Recommendations include using suitable power supplies with current-limiting functions and appropriate protection devices like miniature or circuit breakers.
• Overvoltage protection: Coil damping accessories (RC elements, varistors, diodes) can be ordered separately to suppress opening surges.

Connection Methods:

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

Motor Protection (Compatible Devices):

• For overload protection, compatible with Siemens 3RU2 thermal overload relays or 3RB3 electronic overload relays (sold separately).

Accessories & Spare Parts:

• Auxiliary Switches: The basic unit can be expanded with additional auxiliary switches (permissible configuration must be observed).
• Surge Suppressors: RC elements, varistors, diodes, or diode assemblies can be ordered separately for coil damping.
• Solenoid Coil Replacement: Available for maintenance.
• For a complete list of accessories and spare parts, refer to the “Accessories and spare parts for SIRIUS 3RT2 contactors and SIRIUS 3RH2 contactor relays” documentation.

Application

• Controlling resistive heating elements in industrial furnaces.
• Switching lighting circuits in large facilities.
• Isolation of power generators or solar inverters from the main grid.
• Changeover applications in power distribution panels.

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