Siemens SIRIUS 3RT2325-1BB40 Contactor 4-Pole, AC-1, 35A, 24V DC, S0 Size Original Brand New

Overview

The Siemens SIRIUS 3RT2325-1BB40 is a high-performance 4-pole contactor designed for switching non-inductive or weakly inductive loads (AC-1 applications). With a robust current rating of 35A at 400V/40°C and a 24V DC operating mechanism, this S0 size contactor is ideal for various industrial applications, including disconnecting loads, power generation plant switching, and transfer switching. It comes equipped with convenient screw terminals and integrated 1 NO + 1 NC auxiliary contacts, ensuring reliable operation and flexible integration into your control systems. Built to rigorous IEC standards, the 3RT2325-1BB40 offers excellent contact reliability and a wide range of protection features.

Key Benefit

• Reliable AC-1 Switching: Specifically designed for switching non-inductive or weakly inductive loads, ensuring efficient and safe operation.
• High Current Capacity: Rated for 35A at 400V/40°C, suitable for demanding applications.
• Versatile DC Control: Features a 24V DC operating mechanism for flexible integration into various control circuits.
• Integrated Auxiliary Contacts: Comes with 1 normally open (NO) and 1 normally closed (NC) auxiliary contact, simplifying wiring and expanding control possibilities.
• Robust Screw Terminals: Provides secure and straightforward wiring connections for main and auxiliary circuits.
• Compact S0 Size: Space-saving design for efficient panel layout.
• Enhanced Protection: Designed with provisions for short-circuit, overload, and overvoltage protection for increased system safety and longevity.
• High Contact Reliability: Auxiliary contacts are optimized for switching low voltages (≤ 110V) and currents (≤ 100mA), ideal for solid-state circuits.
• Standards Compliant: Adheres to IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1 standards, guaranteeing quality and safety.
• Damping Options: Can be retrofitted with surge suppressors (RC elements, varistors, diodes) for coil damping, protecting your control system from opening surges.
• Expandable: Compatible with additional auxiliary switches for increased functionality.

Function

• Four-Pole Switching: Capable of switching four separate poles, making it suitable for multi-phase applications or controlling multiple circuits simultaneously.
• Load Disconnection: Effectively disconnects loads from the grid.
• Power Generation Plant Disconnection: Facilitates safe isolation of power generation units.
• Transfer Switching: Enables seamless transfer between different power sources or loads.
• Control Circuit Integration: Auxiliary contacts allow for interlocking, signaling, and control functions within automated systems.

Standards

The Siemens 3RT2325-1BB40 contactor complies with the following international standards:

• IEC 60947-1: Low-voltage switchgear and controlgear – General rules
• IEC 60947-4-1: Low-voltage switchgear and controlgear – Contactors and motor-starters – Electromechanical contactors and motor-starters
• IEC 60947-5-1: Low-voltage switchgear and controlgear – Control circuit devices and switching elements – Electromechanical control circuit devices

Protection of Connections

• Main Connections: Requires suitable protection against overload and short circuits. Refer to the technical product data sheet for free-standing contactor protection, and the Digital/Configuration Manuals for load feeder combinations (contactor with overload relay or circuit breaker).
• Auxiliary Connections: Short-circuit and overload protection information available in the technical product data sheet.
• Control Supply Voltage Connections: Protection selection should consider relevant standards for control panels, cable dimensioning, load characteristics (inrush current, switch-on/holding power), and additional switching elements in the circuit. Power supplies with current-limiting functions and suitable miniature/circuit breakers are recommended.
• Overvoltage Protection (Control Supply): 3RT23 contactors can be retrofitted with RC elements, varistors, diodes, or diode assemblies (ordered separately) for damping opening surges in the coil.

Connection Methods

• Main Circuit: Screw terminals.
• Auxiliary and Control Circuit: Screw terminals.

Electromagnetic Compatibility (EMC)

The contactor fulfills the requirements for environment category A. When used with frequency converters, specific configuration notes in the Equipment Manual must be observed.

Motor Protection

For overload protection, the Siemens 3RT2325-1BB40 contactor can be directly combined with SIRIUS 3RU2 thermal overload relays or SIRIUS 3RB3 electronic overload relays.

Operating Mechanism Types

The 3RT2325-1BB40 features a conventional 24 V DC operating mechanism.

Maintenance and Accessories

• Solenoid Coil Replacement: The solenoid coil of the 3RT2325-1BB40 can be replaced.
• Auxiliary Contacts: The basic unit includes two integrated auxiliary contacts (1 NO + 1 NC) and can be expanded with additional auxiliary switches.
• Accessories & Spare Parts: A wide range of accessories and spare parts are available for SIRIUS 3RT2 contactors and 3RH2 contactor relays. Refer to the product documentation for details.

Application

The Siemens 3RT2325-1BB40 contactor is ideally suited for:

• Four-pole switching of weak or non-inductive loads (AC-1).
• Disconnecting electrical loads from the main power grid.
• Isolating power generation plants from the grid.
• Implementing transfer switching solutions in power distribution systems.

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