Siemens 3RT2627-1NP35 Capacitor Contactor, AC-6b 25 kVAr, 400V, S0, 1 NO + 2 NC Aux Contact Original Brand New

Overview

The Siemens 3RT2627-1NP35 is a high-performance capacitor contactor from the SIRIUS family, specifically engineered for switching capacitive loads (AC-6b) in reactive power compensation systems. This specialized contactor is designed to handle up to 25 kVAr at 400 V, making it ideal for managing the switching of choked or unchoked capacitors. Its key feature is the integration of precharging resistors, which are engaged via leading auxiliary contacts before the main contacts close. This critical function effectively limits the peak charging current, protecting your power supply network from harmful transients and improving overall system reliability.

Key Features & Benefit

• Optimized for Capacitive Loads: Specifically designed for the AC-6b utilization category, ensuring safe and reliable switching of capacitors up to 25 kVAr.
• Minimizes Network Impact: The integrated precharging resistors significantly reduce inrush current, preventing voltage sags and minimizing stress on connected equipment and the power supply network.
• Wide Coil Voltage Range: The 200-280 V AC/DC control supply voltage offers flexibility and compatibility with a broad range of control systems.
• Integrated Surge Protection: An integrated varistor protects the coil from overvoltage surges, extending the contactor’s lifespan and enhancing operational stability.
• Versatile Auxiliary Contacts: The built-in 1 NO + 2 NC auxiliary contacts provide essential feedback and control options for your system.
• Reliable Connections: Robust screw terminals ensure a secure and durable electrical connection, simplifying installation and maintenance.
• Compact Size S0: The compact Size S0 design allows for efficient use of space within control cabinets.

Functions

The 3RT2627-1NP35 functions by first closing leading auxiliary contacts to engage precharging resistors. This allows a limited current to flow and pre-charge the capacitors. Once the capacitors are sufficiently charged, the main contacts close, bypassing the resistors and providing the full current path. This two-stage process is crucial for preventing the high inrush currents typically associated with switching capacitive loads.

Standards & Compliance

This Siemens contactor is manufactured in compliance with international standards, including:

• IEC 60947-1
• IEC 60947-4-1
• IEC 60947-5-1
• IEC 60831-1
• IEC 61921

Protection & Safety

It is essential to implement appropriate short-circuit and overload protection for all connections. For detailed information on protecting main, auxiliary, and control circuits, please refer to the technical product data sheet and relevant Siemens configuration manuals.

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