Siemens 3RT2628-1NB35 SIRIUS Capacitor Contactor, 33kVAr (400V), 3-Pole, S0 Size Original Brand New

Overview

The Siemens 3RT2628-1NB35 is a high-performance SIRIUS capacitor contactor, meticulously engineered for switching capacitive loads up to 33 kVAr at 400 V. As part of the SIRIUS 3RT26 series, this device is a specialized version of the standard 3RT2 contactors, specifically designed for AC-6b applications. It features leading auxiliary contacts that activate precharging resistors, effectively limiting the peak charging current of capacitive loads.

This crucial function minimizes negative impacts on your power supply network, ensuring stable and reliable operation. With its integrated varistor for surge suppression, 1 NO + 2 NC auxiliary contacts, and a robust screw terminal design, the 3RT2628-1NB35 is an ideal choice for reactive current compensation systems and switching converters.

Key Features & Benefits

• Optimized for Capacitive Loads: Specifically designed for AC-6b switching of capacitive loads up to 33 kVAr (at 400 V), making it perfect for power factor correction and reactive power compensation.
• Minimizes Network Impact: The built-in precharging resistors, activated by leading auxiliary contacts, effectively limit inrush currents. This reduces stress on the power supply, improves system stability, and prolongs the lifespan of connected equipment.
• Integrated Overvoltage Protection: Features an integrated varistor that provides surge suppression for the coil circuit, enhancing the contactor’s durability and protecting it from damaging voltage spikes.
• Versatile Control: The contactor is controlled by a wide-range 21-28 V AC/DC coil, offering flexibility in control circuit design.
• Reliable Auxiliary Contacts: Includes 1 NO (Normally Open) and 2 NC (Normally Closed) auxiliary contacts, allowing for seamless integration into control and monitoring circuits.
• Robust & Secure Connections: Equipped with screw terminals for strong, reliable, and easy-to-wire connections.
• Compact Design: With a size of S0, this contactor offers a space-saving solution for modern control panels.
• High Standards Compliance: Conforms to a wide range of international standards, including IEC 60947-1, IEC 60947-4-1, IEC 60831-1, and more, guaranteeing safety and quality.

Functions

The Siemens 3RT2628-1NB35 is a core component for reactive current compensation systems. Its primary function is to safely and efficiently switch capacitors on and off the power grid. The leading auxiliary contacts close momentarily before the main contacts, engaging precharging resistors that limit the high inrush currents typical of capacitor switching. This process prevents voltage dips, reduces harmonic distortion, and minimizes contact erosion. The integrated varistor further protects the coil from damaging overvoltages, ensuring long-term operational integrity.

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