Siemens SIRIUS 3RT2325-2BB40 Contactor 35A, 4-Pole, 24V DC, Spring-Loaded Terminal (Size S0) Original Brand New

Siemens SIRIUS 3RT2325-2BB40 Contactor – Reliable 4-Pole Switching for Industrial Applications

Overview: The Siemens SIRIUS 3RT2325-2BB40 is a high-performance 4-pole contactor, meticulously engineered for demanding industrial control applications, particularly for switching AC-1 loads. This robust Size S0 contactor is rated for 35 A at 400 V / 40 °C and features a 24 V DC coil for efficient operation. With integrated 1 NO + 1 NC auxiliary contacts and user-friendly spring-loaded terminals, it offers reliable performance and simplified wiring. Adhering to stringent international standards like IEC 60947, the 3RT2325-2BB40 ensures safety, reliability, and compatibility within diverse electrical systems.

Key Features & Benefit

• High Current Rating: Handles AC-1 loads up to 35 Amperes, suitable for resistive or slightly inductive applications.
• 4-Pole Configuration: Provides versatile switching capabilities for multi-phase systems or independent load control.
• Efficient DC Operation: Equipped with a 24 V DC operating mechanism, ideal for control circuits requiring DC power.
• Integrated Auxiliary Contacts: Comes with 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contacts for feedback, interlocking, and control circuit integration.
• Spring-Loaded Terminals: Offers quick, secure, and vibration-resistant wiring connections, reducing installation time and maintenance.
• Compact Size S0 Design: Optimizes panel space without compromising performance.
• Standards Compliant: Manufactured according to IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1, ensuring global compatibility and safety.
• Enhanced Reliability: Designed for high contact reliability, especially for low voltage and current switching in solid-state circuits ($\le 110V,\le 100mA$).

Function

• Four-Pole Switching (AC-1): Designed specifically for the switching of weak or non-inductive loads, such as heating elements, lighting, or resistive loads, in a 4-pole configuration.
• Load Disconnection: Effectively disconnects loads or power generation plants from the electrical grid.
• Transfer Switching: Facilitates seamless transfer between different power sources or loads.
• Control Circuit Integration: Auxiliary contacts enable complex control logic, interlocking, and status indication within automation systems.
• Motor Protection Integration: Can be combined with Siemens 3RU2 thermal overload relays or 3RB3 electronic overload relays for comprehensive motor protection (for AC-3 applications with special versions).

Protection & Safety:

The Siemens 3RT2325-2BB40 emphasizes protection for all connections:

• Main Connections: Requires suitable short-circuit and overload protection. Refer to the technical product data sheet or Digital/Configuration Manual for load feeders for detailed guidance, especially when combined with overload relays or circuit breakers.
• Auxiliary Connections: Protection information for auxiliary contacts is available in the technical product data sheet.
• Control Supply Voltage: Requires consideration of relevant standards for control panel configuration, cable dimensioning, and suitable power supply selection (e.g., with current-limiting function). Recommendations for miniature or circuit breakers in control circuits are provided in Siemens’ “Control panel tip.”
• Overvoltage Protection: Can be retrofitted with surge suppressors (RC elements, varistors, diodes) for damping opening surges in the coil (accessories ordered separately). Note that damping may slightly increase break and delay times.
• Electromagnetic Compatibility (EMC): Fulfills requirements for environment category A. Specific configuration notes in the Equipment Manual should be observed when used with frequency converters.

Connection Methods:

• Main Circuit (3RT231 and 3RT232 contactors): Screw or spring-loaded terminals, with convenient plug-in design for device connector available for spring-loaded terminals.
• Auxiliary and Control Circuit: Utilizes reliable screw terminals for secure connections.

Operating Mechanism:

• 3RT23 Contactors: Available with conventional AC or DC operating mechanisms, or wide-range solid-state operating mechanisms for universal AC/DC actuation. Control is via A1-A2 connections with varying operating ranges (see technical product data sheet).

Maintenance & Expansion:

• Solenoid Coil Replacement: Solenoid coils can be replaced on 3RT23 contactors.
• Auxiliary Contact Expansion: The basic unit (1 NO + 1 NC integrated) can be further expanded with additional auxiliary switches, adhering to permissible configurations. Refer to the “Auxiliary switches, instantaneous” overview for detailed information.

Accessories & Spare Parts: A wide range of accessories and spare parts are available for SIRIUS 3RT2 contactors and 3RH2 contactor relays to enhance functionality and ensure long-term operation. Please refer to the specific accessory ordering data or overviews for compatible components.

Application

The Siemens 3RT2325-2BB40 contactor is an ideal solution for:

• Switching non-inductive or weakly inductive loads (AC-1)
• Disconnecting power generation plants or other electrical loads from the grid
• Implementing reliable transfer switching operations
• Integration into industrial control panels, automation systems, and machinery where robust 4-pole switching is required.

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