Siemens 3RT2628-1NF35 Capacitor Contactor, S0, 33 kVAr, 95-130 V AC/DC Original Brand New

Overview

The Siemens 3RT2628-1NF35 is a specialized capacitor contactor from the SIRIUS 3RT2 series, engineered for efficiently switching capacitive loads in applications such as reactive current compensation systems. Designed to meet the demands of AC-6b duty cycles, this size S0 contactor handles loads up to 33 kVAr at 400 V. A key feature is its integrated precharging resistors, which are engaged via leading auxiliary contacts. This innovative design limits the inrush current spikes associated with switching capacitive loads, thereby protecting the power supply network and extending the lifespan of connected equipment. The device includes an integrated varistor for surge suppression and offers flexible connectivity with screw terminals.

Key Features & Benefit

• Optimized for Capacitive Loads: Specifically designed for AC-6b applications, minimizing electrical stress and ensuring reliable operation for capacitor banks and converters.
• Integrated Precharging Resistors: Limits peak charging current, reducing voltage sags and harmonics on the power network. This proactive approach improves system stability and equipment longevity.
• Wide Control Voltage Range: The 95-130 V AC/DC operating range with 50/60 Hz frequency provides versatility and simplifies integration into various control schemes.
• Integrated Varistor: Protects the coil from overvoltage surges, enhancing the device’s durability and reliability.
• Flexible Auxiliary Contacts: Comes with a configuration of 1 NO + 2 NC free auxiliary contacts, allowing for seamless integration into control circuits and signaling.
• Compact Size S0 Design: Space-saving form factor for efficient panel layout and installation.
• Screw Terminals: Ensures a secure and reliable electrical connection.

Functionality

The 3RT2628-1NF35 capacitor contactor operates by first closing leading auxiliary contacts, which connect precharging resistors in series with the main circuit. This process effectively dampens the initial inrush current as the capacitors charge. After a fraction of a second, the main contacts close, bypassing the resistors and allowing the full current to flow. This two-step switching process minimizes transient overcurrents and overvoltages, protecting both the contactor and the connected system.

Standards

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

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

Technical Details

• Product Number: 3RT2628-1NF35
• Product Type: Capacitor Contactor
• AC-6b Rating: 33 kVAr @ 400 V
• Poles: 3-pole
• Control Supply Voltage: 95-130 V AC/DC, 50/60 Hz
• Surge Suppression: Integrated Varistor
• Auxiliary Contacts: 1 NO + 2 NC
• Terminals: Screw Terminals
• Size: S0

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