Siemens 3RT2636-1AK65 S2 Capacitor Contactor, 50 kVAr, 2 NC Aux, Screw Terminal Original Brand New

Overview

The Siemens 3RT2636-1AK65 is a high-performance S2 size capacitor contactor specifically engineered for switching capacitive loads up to 50 kVAr at 400 V. This 3-pole contactor is a specialized variant of the SIRIUS 3RT2 series, designed to mitigate the negative impacts of switching capacitors on the power supply network. It features a unique design with leading auxiliary contacts that engage precharging resistors before the main contacts close.

This critical function limits the high peak charging current, ensuring smooth and reliable operation in reactive current compensation systems and converter applications.

The contactor operates on a control supply voltage of 110 V AC at 50 Hz or 120 V AC at 60 Hz and is equipped with two normally closed (2 NC) auxiliary contacts for enhanced control and monitoring. The robust screw terminals provide a secure and reliable connection.

This device adheres to international standards including IEC 60947 series and IEC 60831-1, guaranteeing safety and quality.

Key Benefits

• Minimizes Network Impact: Precharging resistors limit peak inrush currents, protecting the power supply and connected equipment.
• Reliable Performance: Engineered for the demanding application of switching capacitive loads (AC-6b), ensuring long-term reliability.
• Versatile Application: Ideal for use in reactive current compensation systems, switching choked or unchoked capacitors, and converter applications.
• Simplified Installation: Features a compact size (S2) and user-friendly screw terminals for straightforward wiring.
• Enhanced Control: Integrated 2 NC auxiliary contacts provide additional signaling and control options.
• Compliance with Global Standards: Certified to key international standards (IEC 60947, IEC 60831, etc.), ensuring compatibility and safety.

Functions and Technical Details

• Function: Capacitor Contactor for AC-6b loads
• Rated Power (AC-6b): 50 kVAr at 400 V
• Poles: 3-pole main contacts
• Control Voltage: 110 V AC (50 Hz) / 120 V AC (60 Hz)
• Auxiliary Contacts: 2 NC (Normally Closed)
• Terminals: Screw Terminals
• Size: S2
• Protection:
  • Short-circuit and Overload Protection: All connections must be protected using suitable measures. Refer to the technical product data sheet and configuration manuals for specific recommendations.
  • Overvoltage Protection: The control circuit can be retrofitted with surge suppressors (RC elements, varistors, diodes) to dampen opening surges. Note that this may increase break times.
• Standards: IEC 60947-1, IEC 60947-4-1, IEC 60947-5-1, IEC 60831-1, IEC 61921.

Installation and Expansion

• Auxiliary Switches: The 3RT2636-1AK65, as a 3RT263 variant, comes with integrated auxiliary contacts for the resistors and a 2-pole lateral auxiliary switch (1 NO + 1 NC or 2 NC, depending on the version).
• Expansion Possibilities: The contactor can be expanded with additional lateral auxiliary switches, adhering to the specified configuration limits.
• Coil Circuit: The contactor can be retrofitted with surge suppressors (RC elements, varistors, diodes) for damping opening surges in the coil, which must be ordered separately.

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