Siemens 3RT2327-1BG40 Contactor 4-Pole AC-1, 50A, 125V DC Coil, S0 Size Original Brand New

Overview

The Siemens 3RT2327-1BG40 is a versatile 4-pole contactor from the SIRIUS 3RT23 series, specifically designed for switching non-inductive or weakly inductive loads (AC-1 applications). With a robust 50 A rating at 400 V / 40 °C and a 125 V DC operating mechanism, this S0 size contactor is an ideal choice for a wide range of industrial control and power distribution applications. Its integrated 1 normally open (NO) and 1 normally closed (NC) auxiliary contacts provide essential feedback and control capabilities, while the reliable screw terminals ensure secure and easy wiring.

Key Benefit

• Reliable Switching: Optimized for AC-1 applications, ensuring efficient and safe switching of resistive and non-inductive loads.
• Compact Design (Size S0): Saves valuable panel space, simplifying integration into existing or new control systems.
• Versatile Power Supply: Operates with a 125 V DC coil, suitable for various control voltage requirements.
• Integrated Auxiliary Contacts: Features 1 NO and 1 NC auxiliary contacts for enhanced control logic and signaling.
• Secure Connections: Screw terminals provide robust and reliable wiring connections.
• High Standards Compliance: Meets international standards including IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1, ensuring quality and safety.
• Expandable Functionality: Supports the addition of further auxiliary switches for increased control complexity.

Function

• Four-Pole Switching: Capable of switching four separate circuits simultaneously, making it suitable for multi-phase applications or isolating multiple lines.
• Load Disconnection: Effectively disconnects loads or power generation plants from the grid.
• Transfer Switching: Can be utilized in transfer switching applications for power source management.
• Control Circuit Integration: Auxiliary contacts facilitate integration into complex control circuits for interlocking, signaling, and feedback.
• Protection Compatibility: Designed for seamless integration with Siemens 3RU2 thermal overload relays or 3RB3 electronic overload relays for comprehensive motor protection (though this specific model is AC-1, it is part of a compatible system).

Overview of Protection and Connection

Protection of Device Connections: All connections of the Siemens 3RT2327-1BG40 contactor must be protected against overload and short circuits.

• Main Connections: Refer to the technical product data sheet for specific protection guidelines for a free-standing contactor. For combinations with overload relays or circuit breakers, consult the Digital Configuration Manual for load feeders.
• Auxiliary Connections: Information on protecting auxiliary contacts is available in the technical product data sheet.
• Control Supply Voltage: Protection should align with relevant standards for control panel configuration. Consider power supplies with current-limiting functions and suitable protection devices like miniature circuit breakers. Surge protection for the control supply voltage can be achieved by retrofitting the contactor with optional RC elements, varistors, or diodes (ordered separately).

Connection Methods:

• Main Circuit: This 3RT2327-1BG40 (3RT232 contactor) features reliable screw terminals for the main circuit connections.
• Auxiliary and Control Circuit: Utilizes screw terminals for easy and secure wiring of auxiliary and control circuits.

Electromagnetic Compatibility (EMC)

The Siemens 3RT2327-1BG40 contactor fulfills the requirements for environment category A, ensuring reliable performance in industrial settings. When used with frequency converters, specific configuration notes in the Equipment Manual must be observed.

Contact Reliability of Auxiliary Contacts

The integrated auxiliary contacts of the 3RT2327-1BG40 are designed for high contact reliability, particularly suitable for switching low voltages (≤ 110 V) and currents (≤ 100 mA). They are also ideal for solid-state circuits with currents ≥ 1 mA at voltages of 17 V and higher.

Operating Mechanism Type

This 3RT23 contactor version is equipped with a conventional DC operating mechanism, controlled via the A1 – A2 control supply voltage connection.

Maintenance and Expansion

• Solenoid Coil Replacement: The solenoid coil of the 3RT2327-1BG40 can be replaced, extending the lifespan of the unit.
• Auxiliary Contact Expansion: The basic unit can be easily expanded with additional auxiliary switches to meet evolving control requirements. This model includes two integrated auxiliary contacts (1 NO + 1 NC). For detailed information, refer to 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 more. For detailed ordering data, refer to the “Accessories and spare parts for SIRIUS 3RT2 contactors and SIRIUS 3RH2 contactor relays” documentation.

Application

The Siemens 3RT2327-1BG40 contactor is ideal for:

• Four-pole switching of weak or non-inductive loads (AC-1 category).
• Disconnecting various loads or power generation plants from the electrical grid.
• Implementing transfer switching solutions.

For applications requiring switching of motor-driven loads (AC-3), special versions of the 3RT23 contactors are available.

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