Siemens 3RT2646-1AB03 Capacitor Contactor, 100 kVAr, 400V, 3-Pole, 24V AC, Size S3 Original Brand New

Overview

The Siemens 3RT2646-1AB03 is a specialized capacitor contactor from the SIRIUS 3RT2 series, engineered for the precise and reliable switching of capacitive loads. This robust 3-pole contactor is designed to handle AC-6b applications up to 100 kVAr at 400V. It features a 24V AC, 50 Hz control voltage and comes with integrated auxiliary contacts (1 NO + 1 NC) and screw terminals for secure wiring. The contactor’s Size S3 classification signifies its compact yet powerful design, making it suitable for a wide range of industrial applications, particularly in reactive current compensation systems.

Key Features & Benefit

• Optimized for Capacitive Loads: The 3RT2646-1AB03 is specifically designed for AC-6b applications, using precharging resistors and leading auxiliary contacts to limit peak charging currents. This minimizes network disturbances and extends the life of both the contactor and the connected capacitors.
• High Performance: Capable of handling loads up to 100 kVAr at 400V, this contactor provides reliable performance for reactive power compensation systems and converter switching.
• Integrated Auxiliary Contacts: Equipped with 1 normally open (NO) and 1 normally closed (NC) auxiliary contacts, it allows for easy integration into control and signaling circuits.
• Robust & Secure Connections: The screw terminals ensure a strong, reliable electrical connection, suitable for demanding industrial environments.
• Compact Size S3: The contactor’s compact design (Size S3) allows for space-efficient installation within control panels and electrical cabinets.
• Versatile Control: The 24V AC, 50 Hz control voltage is a standard in many industrial settings, ensuring broad compatibility.
• Expandable Functionality: The contactor can be expanded with additional lateral auxiliary switches and surge suppressors (ordered separately) to meet specific application requirements.

Functionality

The core function of the 3RT2646-1AB03 is to switch capacitive loads with minimal stress on the electrical system. This is achieved through a unique design featuring precharging resistors. These resistors are engaged via leading auxiliary contacts just before the main contacts close. This critical sequence limits the high inrush currents that are characteristic of switching capacitors, thereby protecting the network from voltage sags and harmonics. The contactor is ideal for switching both choked and unchoked capacitors in reactive power compensation systems, a vital function for improving power factor and system efficiency. It is also suitable for switching converters in various industrial applications.

Protection & Safety

• Overload & Short-Circuit Protection: All connections—main, auxiliary, and control—require appropriate protection. Refer to the technical product data sheet for a free-standing contactor or the Digital/Configuration Manuals for device combinations with overload relays or circuit breakers.
• Overvoltage Protection: The contactor’s coil circuit can be retrofitted with optional surge suppressors (RC elements, varistors, diodes) to dampen opening surges, which must be ordered separately.

Expansion and Customization

The Siemens 3RT2646-1AB03 can be customized to meet specific control requirements. While the unit comes with integrated auxiliary contacts, it can be expanded with additional lateral auxiliary switches. Please refer to the documentation for the permissible configuration.

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