Siemens SIRIUS 3RT2337-1AB00 Contactor 110A AC-1, 4-Pole, 24V AC, S2 Size Original Brand New

Siemens SIRIUS 3RT2337-1AB00 Contactor – High-Performance 4-Pole AC-1 Switching Solution

The Siemens 3RT2337-1AB00 is a high-performance 4-pole contactor from the SIRIUS 3RT23 series, engineered for reliable switching of AC-1 (non-inductive or weakly inductive) loads up to 110 A at 400 V / 40 °C. Featuring a 24 V AC, 50 Hz coil and integrated 1 NO + 1 NC auxiliary contacts, this robust S2 size contactor with convenient screw terminals is an essential component for diverse industrial applications, including load disconnection, power generation plant integration, and transfer switching.

Overview

The Siemens 3RT2337-1AB00 is part of the trusted SIRIUS modular system, offering exceptional flexibility and performance for a wide range of switching tasks. Designed to meet stringent international standards, including IEC 60947, this contactor provides reliable operation and simplified integration into your control panels and electrical systems. Its durable construction and comprehensive protection features ensure long-term stability and safety.

Key Features & Benefit

• Robust AC-1 Performance: Rated for 110 A (at 400 V / 40 °C), making it ideal for switching resistive loads, heating circuits, and other non-inductive applications.
• 4-Pole Configuration: Provides simultaneous switching of four independent circuits, offering versatile control options.
• Efficient 24 V AC Coil: Operates on a standard 24 V AC, 50 Hz control supply, compatible with common industrial control systems.
• Integrated Auxiliary Contacts (1 NO + 1 NC): Enhances functionality by providing immediate feedback on contactor status for interlocking, signaling, and control circuits. These contacts ensure high contact reliability, even at low voltages and currents.
• Convenient Screw Terminals: Facilitates secure and straightforward wiring, ensuring reliable connections in demanding environments.
• Compact S2 Size: Optimized for space-saving installation within control cabinets.
• Compliance with Global Standards: Adheres to IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1, guaranteeing international acceptance and safety.
• Enhanced Protection Features: Designed for integration with appropriate short-circuit, overload, and overvoltage protection measures, ensuring the longevity of the device and connected equipment.
• Flexible Application: Suitable for four-pole switching of weak or non-inductive loads, disconnecting loads or power generation plants from the grid, and transfer switching.
• Expandable Auxiliary Switches: Basic unit can be expanded with additional auxiliary switches for increased control and monitoring capabilities.
• Replaceable Solenoid Coil: Allows for easy maintenance and extends the lifespan of the contactor.

Function

The Siemens 3RT2337-1AB00 contactor serves as a critical switching device in electrical circuits. Its primary functions include:

• Switching Non-Inductive Loads: Efficiently connects and disconnects resistive loads, heating elements, and other AC-1 applications.
• Load Disconnection: Provides a reliable means to isolate electrical loads or entire power generation plants from the grid.
• Transfer Switching: Facilitates the controlled transfer of power between different sources or loads.
• Control Circuit Integration: The integrated auxiliary contacts allow for seamless integration into control circuits, enabling interlocking functions, status indication, and sequence control.

Protection and Connectivity:

The 3RT2337-1AB00 requires appropriate protection for its connections:

• Main Circuit Protection: Requires suitable short-circuit and overload protection. Refer to the technical product data sheet or configuration manuals for guidance on free-standing contactors or combinations with overload relays/circuit breakers.
• Auxiliary and Control Circuit Protection: Must be protected against short circuits and overloads. Consider current-limiting power supplies or miniature/circuit breakers as recommended by relevant standards and guidelines.
• Overvoltage Protection: The contactor can be retrofitted with surge suppressors (RC elements, varistors, diodes) for damping opening surges in the coil, protecting against overvoltage. (Note: Damping may slightly increase break and delay times.)
• Connection Methods: Main circuit connections are via robust screw terminals with a box terminal design. Auxiliary and control circuits also utilize screw terminals.

Motor Protection Compatibility:

While the 3RT2337-1AB00 is primarily an AC-1 contactor, it can be combined with Siemens 3RU2 thermal overload relays or 3RB3 electronic overload relays for comprehensive motor protection if used in motor-driven applications requiring AC-3 functionality.

Operating Mechanism:

This 3RT23 series contactor features a conventional AC operating mechanism, controlled via the A1-A2 control supply voltage connection, with defined operating ranges for reliable activation.

Maintenance and Expandability:

• The solenoid coil can be easily replaced, extending the operational life of the contactor.
• The basic unit is equipped with two integrated auxiliary contacts (1 NO + 1 NC) and can be further expanded with additional auxiliary switches to meet complex control requirements.

Application

The Siemens 3RT2337-1AB00 contactor is ideally suited for a wide array of industrial and commercial applications, including:

• Heating and lighting systems
• Resistive load switching
• Capacitor switching (AC-1)
• Transformer primary switching (AC-1)
• Control panel main disconnects
• Building automation systems
• Renewable energy applications (e.g., disconnecting solar inverters from the grid)

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