Siemens SIRIUS 3RT2346-1AF00 Contactor 4-Pole AC-1, 140A, 110V AC Coil, S3 Size Original Brand New

Overview

The Siemens SIRIUS 3RT2346-1AF00 is a high-performance 4-pole contactor specifically designed for switching non-inductive or weakly inductive loads (AC-1) up to 140 Amperes at 400V and 40°C. Part of the renowned SIRIUS family, this S3 size contactor offers exceptional reliability and durability for a wide range of industrial applications, including disconnecting loads, power generation plant integration, and transfer switching. Its 110V AC, 50 Hz coil and integrated 1 normally open (NO) and 1 normally closed (NC) auxiliary contacts provide flexible control options, while robust screw terminals ensure secure connections.

Benefit

• High Current Capacity: Rated for 140A (AC-1) at 400V, suitable for demanding non-inductive load applications.
• Reliable Performance: Built to stringent IEC standards (IEC 60947-1, IEC 60947-4-1, IEC 60947-5-1) ensuring consistent and safe operation.
• Versatile Control: Features a standard 110V AC, 50 Hz coil for common industrial control systems.
• Integrated Auxiliary Contacts: Includes 1 NO + 1 NC auxiliary contacts for seamless integration into control circuits, providing feedback or interlocking.
• Robust Connection: Secure screw terminals for reliable and durable wiring connections.
• Enhanced Safety: Designed with comprehensive guidelines for short-circuit, overload, and overvoltage protection for both main and auxiliary circuits.
• Expandable: Compatible with additional auxiliary switches and surge suppressors for increased functionality and protection (sold separately).
• Long-Term Durability: Constructed with high-quality materials for extended operational life in industrial environments.

Function

• Four-pole Switching (AC-1): Efficiently switches four independent poles for weak or non-inductive loads.
• Load Disconnection: Provides a reliable means to disconnect electrical loads or power generation plants from the grid.
• Transfer Switching: Facilitates the safe and effective transfer between different power sources or circuits.
• Control Integration: Auxiliary contacts enable signaling and interlocking functions within control systems.
• Coil Damping (Optional): Can be retrofitted with surge suppressors (RC elements, varistors, diodes) to dampen opening surges in the coil, protecting sensitive control components.

Standards & Protection

The Siemens 3RT2346-1AF00 contactor adheres to leading international standards for industrial control gear, ensuring its quality and safety:

• IEC 60947-1: General rules for low-voltage switchgear and control gear.
• IEC 60947-4-1: Contactors and motor-starters – Electromechanical contactors and motor-starters.
• IEC 60947-5-1: Control circuit devices and switching elements – Electromechanical control circuit devices.

Protection of Device Connections:

• Short-circuit and Overload Protection of Main Connections: Requires suitable external protection. Refer to the technical product data sheet and configuration manuals for detailed guidance on free-standing contactors or device combinations with overload relays/circuit breakers.
• Short-circuit and Overload Protection of Auxiliary Connections: Consult the technical product data sheet for specific information on auxiliary contact protection.
• Short-circuit and Overload Protection of Control Supply Voltage: Requires consideration of relevant standards for control panel configuration, cable dimensioning, and selection of suitable power supplies (e.g., current-limiting functions). Protection devices should account for contactor load characteristics (inrush current, switch-on power, holding power).
• Protection against Overvoltage at Control Supply Voltage Connection: The 3RT2346-1AF00 can be retrofitted with optional surge suppressors (RC elements, varistors, diodes) for damping opening surges in the coil, ordered separately. Note that damping may slightly increase break and delay times.

Connection Methods

• Main Circuit: Features robust screw terminals with a box terminal for secure cable connections. Direct connection using cable lugs is also possible by removing the box terminal.
• Auxiliary and Control Circuit: Utilizes reliable screw terminals for easy and secure wiring.

Electromagnetic Compatibility

The 3RT2346-1AF00 contactor meets the requirements for environment category A, ensuring its performance in typical industrial electromagnetic environments. When used with frequency converters, specific configuration notes from the Equipment Manual should be observed.

Contact Reliability of Auxiliary Contacts

For switching voltages $\le 110$ V and currents $\le 100$ mA, the integrated auxiliary contacts provide a high level of contact reliability. They are particularly suitable for solid-state circuits with currents $\ge 1$ mA at voltages of 17 V and higher.

Motor Protection

While the 3RT2346-1AF00 is primarily for AC-1 (non-inductive) loads, for comprehensive motor protection against overload, compatible 3RU2 thermal overload relays or 3RB3 electronic overload relays can be directly mounted onto the contactor (sold separately).

Operating Mechanism

This 3RT23 series contactor is equipped with a conventional AC operating mechanism, controlled via the A1-A2 control supply voltage connection.

Accessories & Spare Parts

Expand the functionality and maintain your Siemens 3RT2346-1AF00 contactor with a range of available accessories and spare parts, including:

• Surge Suppressors: RC elements, varistors, diodes for coil damping.
• Additional Auxiliary Switches: For expanding control circuit capabilities.
• Bus Connectors: For broadening connection options (refer to accessories data).

For a complete list of accessories and spare parts compatible with SIRIUS 3RT2 contactors, please visit the accessories section on our website.

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