Siemens 3RT2626-1NF35 Capacitor Contactor AC-6b, 20kVAr, 400V, S0 Size Original Brand New

Overview

The Siemens 3RT2626-1NF35 is a high-performance capacitor contactor specifically engineered for switching capacitive loads in reactive current compensation systems. As part of the SIRIUS 3RT2 series, this special version is designed to handle AC-6b switching duty cycles up to 100 kVAR at 400 V, making it an ideal choice for both choked and unchoked capacitors.

This S0 size contactor features a 3-pole configuration and is equipped with a wide-range control supply voltage of 95-130 V AC/DC, 50/60 Hz. A key characteristic is the inclusion of integrated precharging resistors, which are engaged by leading auxiliary contacts. This innovative design effectively limits the peak charging current of capacitive loads, minimizing negative impacts on the power supply network and extending the lifespan of your equipment.

Key Benefit

• Optimized for Capacitive Loads: Specifically designed for AC-6b switching, ensuring reliable and efficient operation in reactive current compensation systems.
• Reduced Network Impact: Integrated precharging resistors limit inrush current, preventing voltage dips and disturbances on the power supply network.
• Enhanced Durability: Minimizes stress on capacitors and contactor contacts, leading to a longer service life for both components.
• Versatile Control: The wide-range control supply voltage (95-130 V AC/DC) provides flexibility for various control circuit designs.
• Integrated Protection: Comes with an integrated varistor for surge suppression, protecting the coil from overvoltage.
• Easy Integration: Features a screw terminal for secure and straightforward wiring.
• Comprehensive Auxiliary Contacts: Equipped with 1 Normally Open (NO) and 2 Normally Closed (NC) auxiliary contacts, providing ample signaling and control options.

Function and Technical Details

The Siemens 3RT2626-1NF35 operates by utilizing a precharging circuit. When the contactor is energized, leading auxiliary contacts close first, bringing precharging resistors into the circuit. This action limits the initial inrush current as the capacitors charge. Subsequently, the main contacts close, bypassing the resistors and allowing the full current to flow. This sequential process ensures a smooth and controlled connection of the capacitive load.

The device is compliant with 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 quality and safety.

The 3RT2626-1NF35 is part of the 3RT262 series, which features integrated auxiliary contacts for the precharging resistors and two additional free auxiliary contacts (1 NO + 1 NC) as standard. The device size is S0.

Protection and Safety

• Short-Circuit and Overload Protection: All connections (main, auxiliary, and control supply) must be protected with suitable measures. Refer to the technical product data sheet and configuration manuals for detailed recommendations on selecting fuses, circuit breakers, and overload relays.
• Overvoltage Protection: The integrated varistor provides protection against overvoltage spikes on the coil circuit. For contactors supplied without this feature, optional surge suppressors (RC elements, varistors, etc.) can be retrofitted.

Application

• Reactive power compensation systems
• Switching of choked and unchoked capacitors
• Switching converters

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