Siemens SIRIUS 3RT2337-1AC20 Contactor 110A, 4-Pole, 24V AC, S2 Size Original Brand New

Siemens SIRIUS 3RT2337-1AC20 Contactor – Robust & Reliable Power Switching for Non-Inductive Load

The Siemens 3RT2337-1AC20 is a high-performance 4-pole contactor from the renowned SIRIUS series, designed specifically for AC-1 applications. With a rated current of 110 A at 400 V and 40 °C, this S2 size contactor is an ideal solution for switching non-inductive or weakly inductive loads in industrial and commercial settings. Its reliable 24 V AC (50/60 Hz) operating mechanism and integrated 1 NO + 1 NC auxiliary contacts offer versatile control options, while robust screw terminals ensure secure and straightforward wiring.

Overview

The Siemens 3RT2337-1AC20 contactor is a crucial component for efficient and safe power distribution. Built to meet stringent international standards, it provides dependable performance for a wide range of switching tasks, including disconnecting loads, power generation plants from the grid, and transfer switching applications. This contactor is part of the SIRIUS modular system, allowing for seamless integration with other Siemens control gear.

Function

• Four-pole switching: Enables control of multi-phase circuits or multiple single-phase circuits simultaneously.
• Load Disconnection: Effectively disconnects weak or non-inductive loads, and power generation plants from the grid.
• Transfer Switching: Facilitates seamless switching between different power sources or loads.
• Auxiliary Contact Integration: Provides feedback and control signals with the included 1 NO + 1 NC contacts.

Benefit

• High Reliability: Engineered to IEC standards, ensuring consistent and safe operation in demanding environments.
• Versatile Application: Ideal for a wide range of AC-1 applications, offering flexibility in system design.
• Easy Installation: Screw terminals provide a familiar and secure connection method.
• Integrated Auxiliary Contacts: Simplifies wiring and offers immediate feedback for control circuits.
• Modular Design: Part of the SIRIUS family, allowing for easy expansion with accessories like surge suppressors, auxiliary switches, and motor protection relays (e.g., 3RU2 thermal or 3RB3 electronic overload relays).
• Robust Protection: Designed with considerations for short-circuit, overload, and overvoltage protection when integrated with appropriate external measures.

Protection & Safety:

The Siemens 3RT2337-1AC20 is designed with safety in mind. While the contactor itself is robust, proper system integration requires:

• Short-circuit and overload protection of main connections: Refer to the technical product data sheet for free-standing contactors or the Digital/Configuration Manual for load feeders with overload relays or circuit breakers.
• Short-circuit and overload protection of auxiliary and control supply voltage connections: Adhere to relevant standards for control panel configuration, considering load characteristics (inrush current, holding power) and selecting suitable power supplies and protection devices (e.g., miniature circuit breakers).
• Overvoltage protection at control supply: Can be retrofitted with optional RC elements, varistors, or diode assemblies (available separately as accessories) to damp opening surges in the coil.

Connection Methods:

• Main Circuit: Screw terminals with box terminal provide a secure connection. Direct connection with cable lugs is possible after removing the box terminal.
• Auxiliary and Control Circuit: Utilizes reliable screw terminals for easy wiring.

Contact Reliability:

The auxiliary contacts are engineered for high contact reliability, particularly suitable for switching voltages $\le 110V$ and currents $\le 100mA$, and are ideal for solid-state circuits with currents $\ge 1mA$ at $17V$ and higher.

Operating Mechanism:

This 3RT23 contactor features a conventional AC operating mechanism (24 V AC, 50/60 Hz). Replacement of the solenoid coil is possible, and for 3RT233 contactors, even the contacts can be replaced, ensuring longevity and ease of maintenance.

Expandability & Accessories:

The 3RT2337-1AC20 basic unit can be easily expanded with additional auxiliary switches to meet complex control requirements. A wide range of accessories and spare parts are available, including:

• Motor Protection: Compatible with 3RU2 thermal overload relays or 3RB3 electronic overload relays for comprehensive motor protection.
• Surge Suppressors: For damping opening surges in the coil, available as separate accessories.
• Additional Auxiliary Switches: For expanding control and signaling options.

Application

The Siemens 3RT2337-1AC20 is perfectly suited for applications requiring the switching of:

• Weak or non-inductive loads (AC-1)
• Disconnecting loads or power generation plants from the grid
• Transfer switching operations

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