Siemens SIRIUS 3RT2327-1AC20 Contactor, 4-Pole AC-1, 50A, 24V AC Coil, S0 Size, Screw Terminal Original Brand New

Overview

The Siemens SIRIUS 3RT2327-1AC20 contactor is part of the renowned SIRIUS modular system, offering exceptional reliability and versatility for various industrial applications. Designed for AC-1 duty, it excels in switching resistive loads, disconnecting loads, and managing power generation plants. Its compact Size S0 design, combined with integrated auxiliary contacts and flexible screw terminals, makes it a preferred choice for control panels and electrical systems.

Benefit

• Reliable Performance: Engineered to Siemens’ high standards for long-term operational stability and safety in demanding environments.
• Versatile Application: Perfectly suited for 4-pole switching of resistive loads, grid disconnection, and transfer switching applications.
• Space-Saving Design: Compact Size S0 allows for efficient use of panel space.
• Easy Integration: Screw terminals ensure straightforward and secure wiring.
• Enhanced Control: Integrated 1 NO + 1 NC auxiliary contacts provide essential feedback and control options.
• Globally Recognized Standards: Adherence to IEC standards ensures compatibility and safety.

Function

• Load Switching (AC-1): Efficiently switches weak or non-inductive loads, making it ideal for heating elements, lighting systems, and similar resistive applications.
• Power Disconnection: Capable of safely disconnecting loads or power generation plants from the electrical grid.
• Transfer Switching: Can be utilized in transfer switch applications for managing power sources.
• Auxiliary Control: The integrated auxiliary contacts enable signaling the contactor’s status or controlling other components within the circuit.

Technical Details and Protection:

• Protection of Device Connections: All connections (main, auxiliary, control supply) require appropriate short-circuit, overload, and overvoltage protection. Refer to the technical product data sheet and configuration manuals for detailed guidance.
• Main Circuit Protection: For free-standing contactors, consult the technical product data sheet. For combinations with overload relays or circuit breakers, refer to the Digital and Standard Configuration Manuals for load feeders.
• Auxiliary Circuit Protection: Specific protection details for auxiliary contacts are available in the technical product data sheet.
• Control Supply Voltage Protection: Consider relevant standards for control panel configuration, cable dimensioning, and the selection of suitable power supplies with current-limiting functions. Inrush current peaks and holding power characteristics must be factored in when selecting protection devices.
• Overvoltage Protection (Coil): 3RT23 contactors without pre-installed coil damping can be retrofitted with external surge suppressors (RC elements, varistors, diodes) which are ordered separately as accessories.
  • Note: Damping increases contactor break times, NO contact opening delays, and NC contact closing delays. Refer to the Equipment Manual for detailed influence on time response.

Connection Methods:

• Main Circuit (3RT232): Features reliable screw terminals for secure main circuit connections.
• Auxiliary and Control Circuit: Utilizes screw terminals for straightforward and robust wiring of auxiliary and control circuits.

Electromagnetic Compatibility (EMC):

• The 3RT2327-1AC20 fulfills the requirements for environment category A, ensuring reliable operation in industrial settings.
• Note: When used with frequency converters, observe specific configuration guidelines outlined in the Equipment Manual.

Contact Reliability of Auxiliary Contacts:

• For switching low voltages ($\le 110\text{ V}$) and currents ($\le 100\text{ mA}$), the auxiliary contacts of SIRIUS 3RT contactors offer high contact reliability.
• They are particularly suitable for solid-state circuits with currents $\ge 1\text{ mA}$ at voltages of $17\text{ V}$ and higher.

Motor Protection Compatibility:

• For overload protection of motor-driven loads switched by 3RT23 contactors, compatible Siemens 3RU2 thermal overload relays or 3RB3 electronic overload relays can be directly mounted.

Operating Mechanism:

• This 3RT23 contactor features a conventional AC operating mechanism (24 V AC, 50/60 Hz). Control is via connections A1-A2.

Maintenance and Expandability:

• Solenoid Coil Replacement: The solenoid coil of the 3RT2327-1AC20 contactor is replaceable, facilitating easier maintenance and extending product lifespan.
• Auxiliary Contact Expansion: The basic unit comes with two integrated auxiliary contacts (1 NO + 1 NC). Additional auxiliary switches can be mounted to expand control possibilities, adhering to permissible configurations. Refer to “Auxiliary switches, instantaneous → Overview” for detailed fitting information.

Accessories and Spare Parts:

A wide range of accessories and spare parts are available for SIRIUS 3RT2 contactors, including surge suppressors and additional auxiliary switches, ensuring long-term operational flexibility. For specific ordering data, refer to the Siemens SIRIUS 3RT2 accessories catalog.

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