Siemens SIRIUS 3RT2325-2AC20 Contactor 4-Pole, AC-1, 35A, 24V AC, Spring-Loaded Terminal Original Brand New

Overview

The Siemens SIRIUS 3RT2325-2AC20 is a robust and reliable 4-pole power contactor designed for switching weak or non-inductive loads (AC-1 applications). Part of the renowned SIRIUS 3RT23 series, this contactor offers exceptional performance and versatility in industrial control and power distribution systems. With a rated current of 35 A at 400 V and a 24 V AC control voltage, it is an ideal solution for applications requiring dependable switching of resistive loads, heating elements, or general lighting. The innovative spring-loaded terminal technology ensures fast, secure, and vibration-resistant wiring, making installation and maintenance highly efficient.

Benefit

• Optimized for AC-1 Applications: Specifically engineered for switching weak or non-inductive loads, ensuring efficient and reliable operation in resistive circuits.
• Reliable Performance: Built to Siemens’ high-quality standards, guaranteeing long-term stability and operational safety in demanding industrial environments.
• Space-Saving Design: Compact S0 size allows for efficient panel layout and minimizes required installation space.
• Fast & Secure Wiring: Spring-loaded terminals offer quick, tool-free wiring, reducing installation time and ensuring robust connections that resist vibration.
• Integrated Auxiliary Contacts: Includes 1 NO (Normally Open) and 1 NC (Normally Closed) auxiliary contacts for flexible control and signaling functionalities.
• Enhanced Safety: Designed with comprehensive protection considerations for main, auxiliary, and control supply connections against short-circuit, overload, and overvoltage.
• Broad Compatibility: Conforms to international standards (IEC 60947 series) ensuring global applicability and seamless integration into existing systems.

Function & Features

The Siemens 3RT2325-2AC20 contactor offers a range of features designed for optimal performance and ease of use:

• 4-Pole Switching: Capable of simultaneously switching four independent circuits, suitable for three-phase systems with a neutral or other multi-pole applications.
• AC-1 Rating: Specifically designed for switching non-inductive or slightly inductive loads, such as resistance furnaces, heating, and lighting.
• High Current Capacity: Rated for 35 A at 400 V / 40 °C, providing ample capacity for various load types.
• 24 V AC Coil: Operates with a standard 24 V AC (50/60 Hz) control voltage, compatible with common industrial control systems.
• Spring-Loaded Terminals: State-of-the-art connection technology for quick, reliable, and maintenance-free wiring of main and auxiliary circuits.
• Integrated Auxiliary Contacts (1 NO + 1 NC): Provides immediate feedback on contactor status and allows for interlocking or signaling within control circuits.
• Robust Construction: Manufactured to industrial standards for durability and resistance to harsh operating conditions.
• Standard Compliance: Adheres to IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1 (for auxiliary switches), ensuring international recognition and safety.

Protection & Safety

The Siemens 3RT2325-2AC20 contactor incorporates design principles for comprehensive protection:

• Short-Circuit and Overload Protection:
  • Main Connections: Requires suitable external measures (e.g., fuses or circuit breakers) as detailed in the technical product data sheet for free-standing contactors or in the Digital/Configuration Manuals for load feeder combinations (contactor with overload relay or circuit breaker).
  • Auxiliary Connections: Information on protection is available in the technical product data sheet.
  • Control Supply Voltage: Protection considering relevant standards for control panel configuration, cable dimensioning, and suitable power supply selection (e.g., with current-limiting function).
• Overvoltage Protection: 3RT23 contactors can be retrofitted with external surge suppressors (RC elements, varistors, diodes) for damping opening surges in the coil, protecting sensitive control components. Note that damping may increase break and delay times.

Connection Methods

• Main Circuit: Features convenient spring-loaded terminals for 3RT232 contactors, offering quick and secure connections.
• Auxiliary and Control Circuit: Utilizes screw terminals for reliable connections.

Electromagnetic Compatibility (EMC)

The contactors meet the requirements for environment category A, ensuring reliable operation in industrial environments. Specific configuration notes are provided in the Equipment Manual for use with frequency converters.

Contact Reliability of Auxiliary Contacts

For switching low voltages (≤ 110 V) and currents (≤ 100 mA), the integrated auxiliary contacts of 3RT23 contactors ensure a high level of contact reliability. They are particularly suitable for solid-state circuits with currents ≥ 1 mA at voltages of 17 V and higher.

Motor Protection

While the 3RT2325-2AC20 is an AC-1 contactor, for applications requiring motor protection (AC-3), it can be combined with Siemens 3RU2 thermal overload relays or 3RB3 electronic overload relays for comprehensive motor feeder solutions.

Operating Mechanism

This contactor utilizes a conventional AC operating mechanism, controlled via the A1-A2 control supply voltage connection with specified operating ranges (refer to the technical product data sheet for details). The solenoid coil is replaceable, extending the lifespan of the unit.

Expansion Possibilities & Accessories

The 3RT2325-2AC20 comes with two integrated auxiliary contacts (1 NO + 1 NC). The basic unit can be further expanded with additional auxiliary switches, adhering to permissible configurations. For a complete range of compatible accessories and spare parts, refer to the “Accessories and spare parts for SIRIUS 3RT2 contactors and SIRIUS 3RH2 contactor relays” documentation.

Application

The Siemens SIRIUS 3RT23 contactors, including the 3RT2325-2AC20, are ideally suited for:

• Four-pole switching of weak or non-inductive loads (AC-1): Perfect for applications like electric heating, lighting circuits, and resistive loads.
• Disconnecting loads or power generation plants from the grid: Providing a reliable means of isolation.
• Transfer switching: Facilitating the switching between different power sources or loads.

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