Siemens 3RT2645-1NF35 Capacitor Contactor, S3, 75 kVAr, 400V, 83-155V AC/DC, 2 NC Aux Contacts Original Brand New

Overview

The Siemens 3RT2645-1NF35 is a high-performance capacitor contactor from the SIRIUS line, specifically engineered for switching capacitive loads in reactive current compensation systems. This specialized S3-sized contactor is designed for AC-6b applications, capable of handling loads up to 75 kVAr at 400V. Its core function is to mitigate the negative impacts of switching capacitive loads, such as high inrush currents, on the power supply network.

This is achieved through an innovative design featuring integrated precharging resistors. These resistors are switched on via leading auxiliary contacts, which close moments before the main contacts. This action effectively limits the peak charging current, ensuring smooth and reliable operation while protecting both the contactor and the electrical system.

The 3RT2645-1NF35 comes equipped with a versatile 83-155V AC/DC control supply voltage and includes an integrated varistor for overvoltage protection. It features two normally closed (2 NC) auxiliary contacts and utilizes robust screw terminals for secure and easy wiring. This contactor is suitable for switching choked or unchoked capacitors in power factor correction systems and is also used in converter applications.

Key Benefit

• Optimized for Capacitive Loads: Specifically designed for AC-6b applications, the 3RT2645-1NF35 minimizes peak inrush currents, enhancing system stability and component lifespan.
• Integrated Precharging Resistors: The innovative precharging circuit limits charging current peaks, protecting the power supply network and the capacitors.
• Wide Voltage Range: The 83-155V AC/DC control voltage makes it highly flexible for various control circuit designs.
• Built-in Protection: An integrated varistor provides superior overvoltage protection for the coil, extending the device’s operational life.
• Reliable Connectivity: Screw terminals ensure a secure and durable electrical connection.
• Compliance with Global Standards: Adheres to leading international standards including IEC 60947, IEC 60831, and IEC 61921, ensuring quality and safety.

Function

• Capacitor Switching (AC-6b): Switches capacitive loads in reactive current compensation systems, preventing voltage sags and harmonics.
• Inrush Current Limitation: Utilizes precharging resistors to absorb and limit high inrush currents during switching.
• Overvoltage Protection: The integrated varistor protects the coil from harmful voltage surges.
• Auxiliary Contact Operation: The two normally closed (2 NC) auxiliary contacts can be used for signaling, interlocking, or control functions within a larger system.
• Compatibility: Suitable for switching both choked and unchoked capacitors as well as for converter applications.

Technical Specification

• Product Type: Capacitor Contactor
• Product Number: 3RT2645-1NF35
• Size: S3
• Application: AC-6b
• Capacitance: 75 kVAr at 400 V
• Poles: 3-pole
• Control Supply Voltage: 83-155 V AC/DC, 50/60 Hz
• Auxiliary Contacts: 2 NC (normally closed)
• Terminal Type: Screw terminal
• Integrated Features: Varistor, Precharging Resistors
• Standards: IEC 60947-1, IEC 60947-4-1, IEC 60947-5-1, IEC 60831-1, IEC 61921

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