Siemens 3RT2646-1AV03 SIRIUS Capacitor Contactor 100 kVAr, 400V, Size S3 Original Brand New

Overview

The Siemens 3RT2646-1AV03 is a high-performance SIRIUS capacitor contactor specifically engineered for switching capacitive loads in reactive current compensation systems. Designed to handle up to 100 kVAr at 400 V (AC-6b), this 3-pole contactor minimizes the negative impacts of high inrush currents on power networks. Its unique design features leading auxiliary contacts that engage precharging resistors, effectively limiting peak charging currents.

This ensures reliable and efficient operation while protecting both the contactor and the electrical network. With a 400 V AC, 50 Hz control voltage, screw terminals, and a compact Size S3 frame, the 3RT2646-1AV03 is a robust and essential component for power factor correction and converter applications.

Key Features & Benefits

• Optimized for Capacitive Loads: Specifically designed for AC-6b switching of capacitor banks, preventing damage from high inrush currents.
• Integrated Precharging Resistors: Leading auxiliary contacts switch in resistors to limit peak charging current, ensuring smooth operation and network stability.
• High Performance: Handles a rated power of 100 kVAr at 400 V, making it suitable for demanding applications.
• Versatile Auxiliary Contacts: Includes 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contacts for flexible integration into control circuits.
• Robust Construction: Built to the highest standards (IEC 60947 series, IEC 60831-1) for long-lasting reliability and safety.
• Easy Installation: Features screw terminals for secure and straightforward wiring.
• Compact Design (Size S3): Saves valuable panel space while providing powerful functionality.
• Expandable Functionality: Can be retrofitted with surge suppressors and additional auxiliary switches for enhanced control and protection.

Function

The Siemens 3RT2646-1AV03 capacitor contactor operates by first closing its leading auxiliary contacts to connect precharging resistors in series with the capacitor bank. This action effectively dampens the high inrush current. A few milliseconds later, the main contacts close, bypassing the resistors and providing the full power supply to the capacitors. This sequential switching process is crucial for minimizing electrical stress on the system and extending the lifespan of both the contactor and the capacitors. The integrated auxiliary contacts (1 NO + 1 NC) provide feedback to the control system, allowing for status monitoring and interlocking functions.

Standards

The Siemens 3RT2646-1AV03 is certified to meet the following international standards, ensuring quality, safety, and compatibility:

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

Protection and Safety

• Short-Circuit and Overload Protection: All connections must be protected using appropriate measures. Refer to the technical product data sheet for specific recommendations on protecting main, auxiliary, and control supply connections.
• Overvoltage Protection: The contactor can be retrofitted with optional surge suppressors (RC elements, varistors, diodes) to protect the coil circuit from opening surges.

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