Siemens 3RT2337-1AN20 Contactor 4-Pole, AC-1, 110A, 220V AC, S2 Size Original Brand New

Siemens 3RT2337-1AN20 Contactor: Robust 4-Pole Switching for Industrial Application

Overview

The Siemens 3RT2337-1AN20 is a high-performance 4-pole AC-1 contactor designed for reliable switching of non-inductive or weakly inductive loads in industrial and commercial settings. Part of the SIRIUS 3RT2 series, this robust S2 size contactor features a rated operational current of 110 A at 400 V / 40 °C, a 220 V AC 50/60 Hz control supply voltage, and integrated 1 NO + 1 NC auxiliary contacts. Its reliable screw terminals ensure secure connections, making it an ideal choice for diverse applications such as disconnecting loads, managing power generation plants, and transfer switching. Built to IEC standards, the 3RT2337-1AN20 ensures safety and optimal performance.

Function

• Four-Pole Switching: Effectively switches and isolates four circuits simultaneously, ideal for multi-phase or complex load applications.
• AC-1 Operation: Specifically designed for switching resistive or slightly inductive loads, ensuring efficient and safe operation in non-motor applications.
• Load Disconnection: Provides a reliable means to disconnect electrical loads from the grid.
• Power Generation Integration: Suitable for use in power generation plants for control and isolation purposes.
• Transfer Switching: Facilitates the transfer of power between different sources.
• Auxiliary Contact Integration: The built-in 1 NO + 1 NC auxiliary contacts offer flexibility for interlocking, signaling, and control circuit integration.

Benefit

• Reliable Performance: Manufactured to stringent IEC standards (IEC 60947-1, IEC 60947-4-1, IEC 60947-5-1), guaranteeing consistent and safe operation.
• Enhanced Safety: Designed with comprehensive protection guidelines for main, auxiliary, and control circuits against short-circuit, overload, and overvoltage, ensuring robust system integrity.
• Versatile Application: Ideal for a wide range of industrial applications including heating systems, lighting circuits, distribution boards, and power supply systems.
• Easy Integration: Standardized S2 size and screw terminals allow for straightforward installation and compatibility with existing setups.
• Expandable Functionality: Supports the addition of auxiliary switches and other accessories for customized control solutions (see accessories section).
• High Contact Reliability: Auxiliary contacts are optimized for low voltages and currents (≤ 110V, ≤ 100mA), making them suitable for sensitive solid-state circuits.
• Durable Design: Built for longevity in demanding industrial environments.

Standards & Protection:

The Siemens 3RT2337-1AN20 conforms to international standards including IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1 (for auxiliary switches).

Protection of Device Connections:

• Main Connections: Requires suitable short-circuit and overload protection. Refer to the technical product data sheet and configuration manuals for detailed guidance on free-standing contactors and device combinations (contactor with overload relay or circuit breaker).
• Auxiliary Connections: Specific protection details for auxiliary contacts are available in the technical product data sheet.
• Control Supply Voltage Connections: Protection must align with relevant standards for control panel configuration, considering cable dimensioning and load characteristics (inrush current, switch-on/holding power). Options include current-limiting power supplies or miniature circuit breakers.

Overvoltage Protection: For enhanced protection against opening surges in the coil, 3RT23 contactors can be retrofitted with optional surge suppressors (RC elements, varistors, diodes, or diode assemblies). Note that damping may slightly increase break and delay times; refer to the Equipment Manual for details.

Connection Methods:

• Main Circuit: Features robust screw terminals with a box terminal design. Direct connection with cable lugs is possible when the box terminal is removed.
• Auxiliary and Control Circuit: Equipped with reliable screw terminals for secure connections.

Electromagnetic Compatibility (EMC): Fulfills requirements for environment category A. When used with frequency converters, observe configuration notes in the Equipment Manual.

Motor Protection: While primarily for AC-1 loads, the 3RT23 contactors can be combined with 3RU2 thermal overload relays or 3RB3 electronic overload relays for potential overload protection in related systems.

Operating Mechanism: This 3RT23 contactor features a conventional AC operating mechanism, controlled via terminals A1-A2.

Maintenance & Expandability: The solenoid coil on the 3RT2337-1AN20 is replaceable. The basic unit comes with one integrated auxiliary contact (1 NO + 1 NC) and can be further expanded with additional auxiliary switches as per permissible configurations. Refer to the “Auxiliary switches, instantaneous” overview for detailed information on fitting.

Application

The Siemens 3RT2337-1AN20 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
• Integration into control panels and automation systems

Call to Action: Explore the full range of Siemens industrial control products at Turll. For technical specifications, detailed data sheets, and configuration manuals, please visit our website or contact our sales team.

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