Siemens 3RT2628-1AL25 SIRIUS 3RT26 Capacitor Contactor, 33kVAr (400V), 230V AC Coil, S0 Size, Screw Terminal Original Brand New

Overview

The Siemens 3RT2628-1AL25 is a high-performance capacitor contactor from the SIRIUS 3RT26 series, specifically engineered for switching capacitive loads in reactive power compensation systems. This specialized contactor is designed to handle AC-6b applications up to 33 kVAr at 400 V, making it an ideal component for improving power quality and efficiency in industrial and commercial settings. Its key feature is the integration of leading auxiliary contacts with precharging resistors. These resistors engage just before the main contacts, effectively limiting the inrush current that is characteristic of switching capacitive loads.

This crucial function minimizes stress on the power supply network and extends the lifespan of the connected equipment. The 3RT2628-1AL25 features a 3-pole configuration, a 230 V AC control voltage, and a robust S0 size with convenient screw terminals for secure wiring. It also includes 1 NO (Normally Open) and 2 NC (Normally Closed) auxiliary contacts, providing flexibility for control and signaling circuits.

Key Features and Benefits

• Optimized for Capacitive Loads (AC-6b): Specifically designed to switch capacitors up to 33 kVAr (at 400 V), preventing high inrush currents that can damage equipment and destabilize the power grid.
• Integrated Precharging Resistors: Leading auxiliary contacts with built-in resistors limit the peak charging current, ensuring smooth and reliable switching operations.
• Enhanced Network Stability: By minimizing inrush currents, the contactor reduces voltage fluctuations and harmonics, contributing to a more stable and efficient power supply network.
• Robust and Reliable Design: Part of the trusted Siemens SIRIUS 3RT26 series, known for its high quality, durability, and long service life.
• Versatile Auxiliary Contacts: Comes equipped with 1 NO and 2 NC auxiliary contacts, offering flexible options for interlocking, signaling, and control applications.
• Simple and Secure Installation: Features easy-to-use screw terminals for a strong and reliable electrical connection.
• Compact S0 Size: Its space-saving design allows for efficient use of panel space.
• Conformance to International Standards: Meets a wide range of international standards including IEC 60947-1, IEC 60947-4-1, IEC 60947-5-1, IEC 60831-1, and IEC 61921, ensuring safety and compatibility.

Functionality

The 3RT2628-1AL25 capacitor contactor operates by first engaging its leading auxiliary contacts, which connect precharging resistors to the circuit. This initial connection allows the capacitor to begin charging at a reduced rate, effectively damping the inrush current. Moments later, the main contacts close, bypassing the resistors and providing the full current path. When the coil is de-energized, the main contacts open, followed by the auxiliary contacts, safely disconnecting the capacitor. This controlled switching sequence makes it ideal for switching both choked and unchoked capacitors in reactive current compensation systems and for various converter applications.

Protection and Accessories

• Short-Circuit and Overload Protection: The device must be protected against short circuits and overloads using appropriate external measures, such as fuses or circuit breakers. Refer to the technical product data sheet for specific recommendations.
• Overvoltage Protection: Overvoltage suppressors (RC elements, varistors, etc.) are available as separate accessories and can be retrofitted to the coil circuit to dampen switching surges.
• Auxiliary Switches: The basic unit has free auxiliary contacts (1 NO + 2 NC). Additional lateral auxiliary switches can be mounted to expand control possibilities.

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