Siemens 3RT2628-1AF05 Capacitor Contactor, 33 kVAr, 400V, 110V AC, Size S0 Original Brand New

Siemens 3RT2628-1AF05 Capacitor Contactor: Reliable Power Factor Correction

The Siemens 3RT2628-1AF05 is a high-performance capacitor contactor from the trusted SIRIUS line, specifically engineered for switching capacitive loads (AC-6b) up to 33 kVAr at 400V. This contactor is a crucial component for reactive current compensation systems and power factor correction, where it ensures stable and efficient operation by limiting peak charging currents.

Overview

The 3RT2628-1AF05 is a 3-pole, size S0 contactor equipped with a 110V AC, 50 Hz control voltage and screw terminals for secure wiring. Its key feature is the integrated precharging resistors, which are engaged via leading auxiliary contacts. This design effectively dampens the high inrush currents typical of capacitor switching, protecting the power grid and extending the life of your equipment. It comes with a flexible auxiliary contact configuration of 1 Normally Open (NO) and 2 Normally Closed (NC) contacts, providing versatility for control and signaling applications.

Key Benefits & Features

• Optimized for Capacitive Loads (AC-6b): Designed with integrated precharging resistors to safely switch capacitors, limiting peak charging currents and minimizing stress on the electrical network.
• Enhanced Network Stability: By controlling inrush currents, the contactor helps prevent voltage sags, flickers, and other power quality issues associated with capacitor switching.
• Durable and Reliable: Built to IEC standards (IEC 60947, IEC 60831), ensuring a robust and long-lasting solution for industrial environments.
• Versatile Auxiliary Contacts: Features a 1 NO + 2 NC auxiliary contact configuration, offering ample options for interlocking, signaling, and control circuits.
• Easy Installation: Standardized size S0 with convenient screw terminals simplifies mounting and wiring into existing control panels.
• Comprehensive Protection: The device connections are designed to be easily protected against short circuits and overloads, providing a safer and more reliable system.

Function

The Siemens 3RT2628-1AF05 operates by first closing its leading auxiliary contacts to engage precharging resistors. This allows the capacitors to charge gradually, effectively limiting the inrush current. Following this, the main contacts close, bypassing the resistors and providing the full current path. This two-step process is crucial for minimizing the negative impact on the power supply network and protecting the capacitors and connected equipment.

Protection

• Short-Circuit and Overload Protection: All connections must be protected using appropriate measures. Refer to the technical product data sheet for detailed recommendations and to the Digital Configuration Manual for guidance on device combinations.
• Overvoltage Protection: For enhanced protection of the control circuit, optional surge suppressors (RC elements, varistors, etc.) can be retrofitted.

Configuration & Expansion

The basic unit includes the auxiliary contacts for the precharging resistors and two additional free auxiliary contacts (1 NO + 1 NC). The design allows for flexible expansion with additional lateral auxiliary switches, ensuring the contactor can be integrated into complex control schemes.

Shop our wide range of industrial automation products and find more from the SIRIUS line at Turll.