Siemens 3RT2646-1NB35 SIRIUS Capacitor Contactor AC-6b, 100 kVAr, 400V, 3-Pole, 20-33V AC/DC, Size S3 Original Brand New

Overview

The Siemens 3RT2646-1NB35 is a high-performance SIRIUS 3RT26 capacitor contactor specifically engineered for switching capacitive loads in reactive current compensation systems. This specialized contactor is designed to handle demanding applications with its robust construction and advanced features. The 3RT2646-1NB35 model is a 3-pole contactor rated for AC-6b applications up to 100 kVAr at 400 V.

Its intelligent design incorporates leading auxiliary contacts that switch on precharging resistors, effectively limiting peak charging currents and minimizing disturbances to the power supply network. This model features a 20-33 V AC/DC control supply voltage, an integrated varistor for surge suppression, and 2 NC auxiliary contacts. The S3 size contactor is equipped with reliable screw terminals for secure and easy wiring.

Key Features & Benefits

• Optimized for Capacitive Loads (AC-6b): The 3RT2646-1NB35 is purpose-built to switch capacitors, making it ideal for reactive power compensation systems.
• Current Limiting Technology: Precharging resistors, activated by leading auxiliary contacts, dramatically reduce inrush currents, protecting the power grid and extending the life of connected components.
• Integrated Varistor: An integrated varistor provides superior overvoltage protection for the control coil, enhancing the device’s reliability and durability.
• Versatile Control Voltage: The wide 20-33 V AC/DC control voltage range allows for flexible integration into various control circuits.
• Standardized Compliance: Adheres to key international standards including IEC 60947-1, IEC 60947-4-1, IEC 60947-5-1, IEC 60831-1, and IEC 61921, ensuring safety and quality.
• Reliable Auxiliary Contacts: Equipped with two normally closed (2 NC) auxiliary contacts for feedback and control circuit integration.
• Durable Design (Size S3): Built to withstand rigorous industrial environments with a compact and robust S3 frame size.
• Easy Installation: Features screw terminals for straightforward and secure wiring.

Functionality

The Siemens 3RT2646-1NB35 capacitor contactor operates by first closing leading auxiliary contacts, which introduce precharging resistors into the circuit. This initial step limits the high inrush current typically associated with switching capacitive loads. After a short delay, the main contacts close, bypassing the resistors and allowing full current flow to the capacitor. This two-stage switching process effectively mitigates electrical stress and power quality issues. The integrated varistor protects the control circuit from transient overvoltages. This contactor is suitable for switching both choked and unchoked capacitors in reactive current compensation systems and can also be used for switching converters.

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