Siemens SIRIUS 3RT2337-1AF00 Contactor 4-Pole AC-1, 110A, 110V AC Coil, S2 Size Original Brand New

Overview

The Siemens SIRIUS 3RT2337-1AF00 is a high-performance 4-pole contactor from the renowned 3RT23 series, engineered for demanding AC-1 applications. This contactor excels in switching weak or non-inductive loads, making it ideal for disconnecting loads, managing power generation plants, and transfer switching. Built to rigorous IEC standards, it ensures exceptional reliability and longevity in industrial environments. Its compact S2 size, coupled with user-friendly screw terminals, facilitates straightforward installation and integration into control panels.

Function

The Siemens 3RT2337-1AF00 contactor primarily functions as an electrically operated switch for power circuits. Its core applications include:

• Four-pole switching of weak or non-inductive loads (AC-1): Efficiently controls resistive loads, furnaces, heating elements, and other applications where the inrush current is not significantly higher than the operational current.
• Disconnecting loads or power generation plants from the grid: Provides a reliable means to isolate equipment or entire power systems for maintenance, safety, or operational adjustments.
• Transfer switching: Enables the seamless transition between different power sources or load configurations.
• Integration into control circuits: The integrated auxiliary contacts (1 NO + 1 NC) provide feedback to control systems or activate other components based on the contactor’s state.

Benefit

• Reliable Performance: Manufactured to strict IEC standards (IEC 60947-1, IEC 60947-4-1, IEC 60947-5-1), ensuring consistent and safe operation.
• Versatile Application: Ideal for a wide range of AC-1 applications in industrial automation, power distribution, and machinery control.
• Enhanced Safety: Designed with considerations for short-circuit, overload, and overvoltage protection for main, auxiliary, and control connections.
• Easy Integration: Standardized S2 size and screw terminals simplify mounting and wiring in control cabinets.
• Durable Construction: Siemens’ commitment to quality ensures a robust product built to withstand harsh industrial conditions.
• Flexible Protection Options: Compatible with 3RU2 thermal overload relays or 3RB3 electronic overload relays for comprehensive motor protection (though this contactor is primarily for non-motor loads, it can be part of a larger system).
• Auxiliary Contact Reliability: High contact reliability for switching low voltages and currents (≤ 110V, ≤ 100mA), suitable for solid-state circuits.
• Optional Surge Suppression: Can be retrofitted with surge suppressors (RC elements, varistors, diodes) to dampen opening surges in the coil, protecting sensitive control circuits.

Standard & Protection

The Siemens 3RT2337-1AF00 adheres to the following international standards, ensuring high quality and safety:

• IEC 60947-1: General rules for low-voltage switchgear and controlgear.
• 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 Connections: All connections must be protected against overload and short circuits. Specific considerations apply to different connection types:

• Main Connections: Refer to the technical product data sheet for free-standing contactor protection. For device combinations (contactor with overload relay or circuit breaker), consult the Digital Configuration Manual for load feeders.
• Auxiliary Connections: Protection information is available in the technical product data sheet.
• Control Supply Voltage Connections: Adhere to relevant standards for control panel configuration. Suitable power supplies with current-limiting functions and appropriate protection devices (e.g., miniature or circuit breakers) should be selected, considering the contactor’s load characteristics (inrush current, switch-on, holding power).

Overvoltage Protection (Control Supply Voltage): The 3RT2337-1AF00 can be retrofitted with external surge suppressors (RC elements, varistors, diodes, or diode assemblies) to dampen opening surges in the coil. These accessories must be ordered separately. Note that damping may increase contactor break times and auxiliary contact delay times.

Connection Methods

• Main Circuit: Features screw terminals with a box terminal for secure and reliable main circuit connections. Direct connection with cable lugs is possible when the box terminal is removed.
• Auxiliary and Control Circuit: Equipped with reliable screw terminals for easy wiring of auxiliary and control circuits.

Electromagnetic Compatibility (EMC)

This contactor fulfills the requirements for environment category A, indicating its suitability for industrial environments. When used with frequency converters, specific configuration notes in the Equipment Manual must be observed.

Motor Protection & Operating Mechanism

While primarily for AC-1 loads, the 3RT23 contactors can be complemented for motor protection with:

• 3RU2 thermal overload relays
• 3RB3 electronic overload relays

The 3RT2337-1AF00 features a conventional AC operating mechanism, controlled via the A1-A2 control supply voltage connection with varying operating ranges (see technical product data sheet for details). Solenoid coil replacement is possible for this model, and only the contacts for 3RT233 contactors can be replaced.

Auxiliary Contacts & Expansion

The basic unit of the 3RT2337-1AF00 includes two integrated auxiliary contacts (1 NO + 1 NC). The unit can be further expanded with additional auxiliary switches, provided the permissible configuration is observed. Detailed information on fitting auxiliary switches can be found in the “Auxiliary switches, instantaneous” overview.

Accessories and Spare Parts

A wide range of accessories and spare parts are available for the SIRIUS 3RT2 contactors, including surge suppressors, additional auxiliary switches, and overload relays. Please refer to the Siemens SIRIUS 3RT2 contactors and SIRIUS 3RH2 contactor relays accessories and spare parts documentation for compatible options.

Application

The Siemens 3RT2337-1AF00 contactor is ideally suited for:

• Switching non-inductive or weakly inductive loads (AC-1) in various industrial processes.
• Implementing load disconnection in manufacturing plants, commercial buildings, and infrastructure.
• Controlling power generation units, including those utilizing renewable energy sources.
• Enabling transfer switching applications for power redundancy and system flexibility.

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