Siemens 3RT2626-1BB45 SIRIUS Capacitor Contactor 20 kVAr AC-6b, 3-Pole, 24V DC Coil Original Brand New

Overview

The Siemens 3RT2626-1BB45 is a high-performance SIRIUS capacitor contactor, meticulously engineered for switching capacitive loads up to 20 kVAr at 400 V. As part of the 3RT2 series, this specialized 3-pole contactor is designed for demanding applications like reactive current compensation systems and switching converters. Its core innovation lies in the use of leading auxiliary contacts with precharging resistors.

These resistors are engaged before the main contacts close, effectively limiting the peak charging current. This crucial feature minimizes stress on the power supply network and enhances the longevity of both the contactor and the connected capacitors. With a robust design, a 24 V DC coil, and a size S0 frame, this contactor provides reliable and efficient operation.

Key Features & Benefits

• Optimized for Capacitive Loads (AC-6b): Specifically designed to handle the high inrush currents associated with switching capacitors, ensuring reliable and safe operation.
• Integrated Precharging Resistors: Leading auxiliary contacts with precharging resistors limit the peak charging current, protecting the power supply network from negative impacts.
• High Performance: Rated for up to 20 kVAr at 400 V, making it suitable for a wide range of reactive power compensation applications.
• Robust Construction: The 3-pole design and S0 size frame provide a compact yet durable solution for industrial environments.
• Versatile Auxiliary Contacts: Features 1 Normally Open (NO) and 2 Normally Closed (NC) auxiliary contacts, offering flexible control and feedback options.
• Secure Screw Terminals: Ensures a reliable and durable electrical connection.
• 24 V DC Coil: A common and reliable control voltage for industrial automation systems.
• Compliance with International Standards: Adheres to critical standards including IEC 60947-1, IEC 60947-4-1, and IEC 60831-1, guaranteeing quality and safety.

Functions

The 3RT2626-1BB45 contactor’s primary function is to safely and efficiently switch capacitive loads in reactive current compensation systems and converter applications. The integrated precharging resistors play a vital role by:

• Limiting Inrush Current: The resistors are activated just before the main contacts close, absorbing the initial high current spike from the capacitors.
• Minimizing Network Disturbance: By reducing the peak charging current, the contactor prevents voltage sags and harmonic distortion on the power supply network.
• Protecting Equipment: The controlled switching process extends the lifespan of both the contactor and the capacitors.

Standards

• IEC 60947-1
• IEC 60947-4-1
• IEC 60947-5-1
• IEC 60831-1
• IEC 61921

Protection Information

The 3RT2626-1BB45 requires appropriate short-circuit and overload protection for all connections (main, auxiliary, and control). Detailed information on selecting protection devices can be found in the technical product data sheet and Siemens configuration manuals. Overvoltage protection for the control coil can be retrofitted using separate accessories like RC elements or varistors.

Auxiliary Contact Configuration 

The 3RT2626-1BB45 (size S0) comes standard with two freely usable auxiliary contacts (1 NO + 1 NC), in addition to the four contacts assigned to the precharging resistors. This allows for seamless integration into existing control circuits.