Siemens 3RT2636-1AB05 Capacitor Contactor 50 kVAr, 400V, 24V AC, 2 NC Aux Contacts, S2 Original Brand New

Overview

The Siemens 3RT2636-1AB05 is a high-performance capacitor contactor specifically engineered for switching capacitive loads in power factor correction systems. Part of the SIRIUS 3RT2 series, this robust size S2 contactor is designed to handle AC-6b loads up to 50 kVAr at 400 V, making it an ideal choice for reactive current compensation applications. A key feature of the 3RT2636-1AB05 is its integrated precharging resistors, which are engaged via leading auxiliary contacts.

This innovative design limits the inrush current spikes that are characteristic of switching capacitive loads, thereby protecting the power supply network and extending the lifespan of both the contactor and the capacitors. The unit is equipped with a 24 V AC, 50 Hz coil and features 2 normally closed (NC) auxiliary contacts, along with a secure screw terminal connection for reliable wiring.

Features and Functions

• Capacitive Load Switching (AC-6b): Specifically designed to manage the high inrush currents associated with capacitive loads up to 50 kVAr at 400 V.
• Integrated Precharging Resistors: Leading auxiliary contacts bring precharging resistors into the circuit before the main contacts close, effectively limiting peak charging currents.
• Minimizes Network Impact: By controlling inrush currents, the contactor reduces voltage sags and harmonics, improving overall power quality.
• Robust Construction: The size S2 frame and screw terminals ensure a strong, reliable connection and mechanical stability in demanding industrial environments.
• Auxiliary Contacts: Includes 2 normally closed (NC) auxiliary contacts for feedback and control circuit integration.
• Standards Compliant: Adheres to critical international standards including IEC 60947-1, IEC 60947-4-1, and IEC 60831-1, ensuring safety and performance.

Benefits

• Enhanced System Longevity: Protects capacitors and other sensitive equipment from damaging inrush currents.
• Improved Power Quality: Reduces electrical disturbances, leading to more stable and efficient operation of connected systems.
• Simplified Installation: Screw terminals offer a familiar and secure connection method.
• Versatile Application: Suitable for use in both choked and unchoked reactive current compensation systems and for switching converters.
• Reliable Performance: Siemens’ SIRIUS line is renowned for its durability and consistent performance in industrial settings.

Protection and Accessories

The 3RT2636-1AB05 requires suitable protection against short-circuit and overload in both its main and auxiliary circuits. Overvoltage protection for the control supply voltage can be added with optional surge suppressors (RC elements, varistors, or diodes), which must be ordered separately. This contactor can be further expanded with lateral auxiliary switches to meet specific control requirements. For detailed protection and configuration guidelines, refer to the provided technical documentation.

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