Siemens SIRIUS 3RT2326-1BB40-4AA0 Power Contactor, 32A, 15kW, 4-Pole, 24V DC, S0 Size Original Brand New

Overview

The Siemens SIRIUS 3RT2326-1BB40-4AA0 power contactor is a robust and versatile solution for switching weak or non-inductive loads (AC-1) and for motor-driven loads (AC-3) in demanding industrial environments. Part of the renowned SIRIUS 3RT2 series, this contactor is built to IEC 60947 standards, ensuring high performance and reliability. Its compact S0 size makes it suitable for integration into various control panels.

Key Features

• High Performance: Capable of handling 32 A (AC-3) and 15 kW at 400 V, ideal for a wide range of applications.
• DC Operation: Features a 24 V DC operating mechanism for precise and reliable control.
• Integrated Auxiliary Contacts: Comes with 1 NO + 1 NC auxiliary contacts, providing immediate feedback and control options.
• Secure Connections: Equipped with robust screw terminals for secure and straightforward wiring of main, auxiliary, and control circuits.
• Standards Compliance: Manufactured and tested according to IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1 (for auxiliary switches), ensuring global applicability and safety.

Standard

• IEC 60947‑1
• IEC 60947‑4‑1
• IEC 60947‑5‑1 (auxiliary switches)

Protection of Device Connection

All connections on the Siemens 3RT2326-1BB40-4AA0 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 as motor feeders, consult the Digital Configuration Manual for load feeders or the Configuration Manual for load feeders.
• Auxiliary Connections: Information on auxiliary contact protection is available in the technical product data sheet.
• Control Supply Voltage Connections: Protection must align with relevant standards for control panel configuration. Suitable power supplies with current-limiting functions are recommended, considering the contactor’s load characteristics (inrush current, switch-on power, holding power).

Protection Against Overvoltage

3RT23 contactors can be retrofitted with surge suppressors (RC elements, varistors, diodes, or diode assemblies) to dampen opening surges in the coil. These accessories must be ordered separately. Note that damping increases break times and delays of auxiliary contacts.

Connection Methods

• Main Circuit: Screw terminals, designed for secure and easy connection.
• Auxiliary and Control Circuit: Reliable screw terminals for all auxiliary and control connections.

Electromagnetic Compatibility

The 3RT2326-1BB40-4AA0 fulfills the requirements for environment category A. When used with frequency converters, specific configuration notes in the Equipment Manual must be observed.

Contact Reliability of Auxiliary Contact

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

Motor Protection

For overload protection, 3RU2 thermal overload relays or 3RB3 electronic overload relays can be directly mounted onto the 3RT23 contactor.

Operating Mechanism Type

This contactor features a 24 V DC operating mechanism, offering precise and reliable control via the A1 – A2 control supply voltage connection.

Replacing Solenoid Coil

Solenoid coil replacement is possible for the 3RT2326-1BB40-4AA0 model.

Fitting Auxiliary Contacts and Mounting Additional Auxiliary Switches

The basic unit includes two integrated auxiliary contacts (1 NO + 1 NC). The contactor can be expanded with additional auxiliary switches, subject to permissible configurations. For detailed information, refer to the Auxiliary switches, instantaneous → Overview.

Accessories and Spare Part

A wide range of accessories and spare parts are available for the SIRIUS 3RT2 contactors. Please refer to the “Accessories and spare parts for SIRIUS 3RT2 contactors” section for compatible component.

Application

The Siemens SIRIUS 3RT2326-1BB40-4AA0 is ideal for:

• Four-pole switching of weak or non-inductive loads (AC-1).
• Disconnecting loads or power generation plants from the grid.
• Transfer switching applications.
• Switching motor-driven loads (AC-3).

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