Siemens 3RT2626-1AL25 Capacitor Contactor 20 kVAr, 230V AC, 3-Pole, Size S0 Original Brand New

Overview

The Siemens 3RT2626-1AL25 is a high-performance capacitor contactor from the SIRIUS line, specifically engineered for switching capacitive loads in reactive power compensation systems. Designed to meet the stringent demands of the IEC 60947 standard, this 3-pole contactor effectively handles AC-6b applications up to 20 kVAr at 400 V. Its robust design incorporates leading auxiliary contacts and precharging resistors, which work together to limit peak charging currents and protect the power supply network. This makes the 3RT2626-1AL25 an ideal solution for reliable and efficient operation of choked or unchoked capacitors and converters.

Key Features & Benefit

• Optimized for Capacitive Loads (AC-6b): Built with precharging resistors and leading auxiliary contacts, this contactor minimizes inrush currents, extending the life of your capacitors and the contactor itself.
• High Performance: Capable of switching up to 20 kVAr at 400 V, making it suitable for a wide range of power factor correction applications.
• Robust and Reliable: Adheres to international standards including IEC 60947, IEC 60831, and IEC 61921, ensuring dependable performance and safety.
• Integrated Auxiliary Contacts: Features a configuration of 1 NO + 2 NC free auxiliary contacts, providing flexibility for control and monitoring circuits.
• Convenient Screw Terminals: The secure screw terminal connections ensure easy and reliable wiring.
• Compact Size S0: Its small footprint allows for efficient use of space within control panels.
• Easy to Integrate: Part of the modular SIRIUS family, making it simple to combine with other Siemens components.

Technical Specification

• Product Number: 3RT2626-1AL25
• Product Type: Capacitor Contactor
• Rated Power (AC-6b): 20 kVAr at 400 V
• Number of Poles: 3
• Control Supply Voltage: 230 V AC, 50/60 Hz
• Auxiliary Contacts: 1 NO + 2 NC
• Terminal Type: Screw Terminal
• Size: S0
• Standards: IEC 60947, IEC 60831, IEC 61921

Function

The Siemens 3RT2626-1AL25 capacitor contactor is engineered to mitigate the challenges associated with switching capacitive loads. The core of its functionality lies in its leading auxiliary contacts and integrated precharging resistors. When the contactor is energized, the auxiliary contacts close slightly before the main contacts. This action engages the precharging resistors, which limit the initial inrush current as the capacitors charge. Once the charging is complete, the main contacts close, bypassing the resistors for steady-state operation. This process effectively minimizes electrical stress on both the capacitor and the power grid, leading to enhanced system stability and longevity.

Protection and Installation

Proper protection of the Siemens 3RT2626-1AL25 is crucial for safe and long-term operation. All connections—main, auxiliary, and control—must be protected against short circuits and overloads using suitable measures such as fuses or circuit breakers. The device is designed to be easily integrated into a larger control panel. For detailed configuration and protection recommendations, refer to the Digital and Configuration Manuals for Siemens load feeders. For further protection against overvoltage on the control side, optional surge suppressors (RC elements, varistors, etc.) are available as separate accessories.

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