Siemens 3RT2645-1AF03 Capacitor Contactor, AC-6b 75 kVAr, 400V, 3-Pole, 110V AC Coil, Screw Terminal, S3 Size Original Brand New

Overview

The Siemens 3RT2645-1AF03 is a specialized 3-pole capacitor contactor designed for switching capacitive loads in applications such as reactive power compensation systems. It is part of the SIRIUS 3RT26 series, engineered to handle the specific challenges of switching capacitors, minimizing stress on the power network.

This model is rated for an AC-6b load of 75 kVAr at 400V and features a 110V AC, 50 Hz control coil. Its robust design includes leading auxiliary contacts that engage precharging resistors to limit inrush current, ensuring reliable and efficient operation.

Key Features & Benefits

• Optimized for Capacitive Loads: The 3RT2645-1AF03 is specifically designed for AC-6b duty, making it the ideal choice for switching capacitors in power factor correction systems.
• Inrush Current Limitation: Integrated precharging resistors, activated by leading auxiliary contacts, effectively limit the high peak charging current, protecting the contactor and extending the lifespan of the entire system.
• High Performance: Rated for up to 75 kVAr at 400V, this contactor offers robust performance for medium-to-large scale reactive power compensation.
• Reliable Control: The 110V AC control coil (50 Hz) provides a standard and reliable means of operation.
• Standardized Auxiliary Contacts: The built-in 1 NO + 1 NC auxiliary contacts offer flexibility for status indication and control circuit integration.
• Secure Connections: Screw terminals provide a simple and secure method for wiring the main and auxiliary circuits.
• Compact Design (Size S3): Despite its high rating, the S3 size ensures a relatively compact footprint for efficient panel design.
• Safety and Standards: The product complies with major international standards including IEC 60947-1, IEC 60947-4-1, IEC 60831-1, and others, ensuring safety and quality.

Protection & Safety 

Proper protection is essential for the reliable operation of the 3RT2645-1AF03.

• Short-Circuit and Overload Protection: All connections (main, auxiliary, and control supply) must be protected by suitable measures. For main connections, the technical product data sheet provides guidance. For combinations like contactor-circuit breaker setups, refer to the Digital and Standard Configuration Manuals for load feeders.
• Overvoltage Protection: The control coil can be protected against opening surges by retrofitting surge suppressors (RC elements, varistors, etc.), which are available as separate accessories. This helps prevent damage and ensures reliable operation of the control circuit.
• Standard Compliance: The contactor meets a comprehensive set of IEC standards, confirming its design for safe and reliable operation in industrial environments.

Auxiliary Contact Configuration

The 3RT2645-1AF03, as a 3RT264 model, has integrated auxiliary contacts for the precharging resistors. It also comes standard with a 2-pole lateral auxiliary switch mounted on the left side, which contains the 1 NO + 1 NC free auxiliary contacts mentioned in the product specifications. This configuration provides a ready-to-use solution for integration into control circuits. The device can also be expanded with additional lateral auxiliary switches if required, adhering to the permissible configuration limits.

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