Siemens 3RT2645-1NP35 Capacitor Contactor, S3, 75 kVAr, 400V, 175-280V AC/DC, 2 NC Auxiliary Contact Original Brand New

Overview

The Siemens 3RT2645-1NP35 is a high-performance capacitor contactor specifically designed for switching capacitive loads (AC-6b) up to 75 kVAr at 400 V. As a specialized version of the 3RT2 series, this size S3 contactor features integrated precharging resistors that engage via leading auxiliary contacts. This innovative design limits the peak charging current, minimizing negative impacts on the power supply network. The 3RT2645-1NP35 is ideal for use in reactive current compensation systems, switching choked or unchoked capacitors, and is also suitable for switching converters. It comes with a robust screw terminal connection and an integrated varistor for surge suppression.

Key Benefit

• Optimized Performance: Limits peak charging currents of capacitive loads, protecting your electrical network from harmful transients.
• Enhanced Durability: The integrated varistor provides effective protection against overvoltage surges, extending the lifespan of the contactor and connected equipment.
• Versatile Application: Suitable for reactive power compensation systems, switching converters, and handling both choked and unchoked capacitors.
• Comprehensive Safety: Built to international standards (IEC 60947 series) ensuring reliable and safe operation.
• Easy Integration: The compact size S3 design and screw terminals facilitate straightforward installation and wiring.

Function

The 3RT2645-1NP35 functions by utilizing leading auxiliary contacts to engage precharging resistors before the main contacts close. This critical sequence limits the inrush current that occurs when switching a capacitive load, which can be significantly higher than the steady-state current. By controlling this current spike, the contactor reduces electrical stress on the system, prevents voltage sags, and improves the overall quality of the power supply. The integrated varistor absorbs and dissipates overvoltage spikes, protecting the control circuit.

Standards and Certification

This product complies with the following international standards, ensuring quality and reliability:

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

Installation and Protection

For optimal performance and safety, all connections must be protected against short circuits and overloads. The technical product data sheet provides detailed information on short-circuit and overload protection for main and auxiliary circuits. For guidance on device combinations, refer to the Siemens Digital Configuration Manual for load feeders.

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