Siemens 3RT2637-1NB35 SIRIUS Capacitor Contactor, 75 kVAr, 400V, 3-Pole, Size S2 Original Brand New

Overview

The Siemens 3RT2637-1NB35 is a high-performance SIRIUS capacitor contactor designed for switching capacitive loads in reactive current compensation systems. Part of the robust SIRIUS 3RT2 series, this specialized contactor is engineered to handle AC-6b loads up to 75 kVAr at 400 V. Its primary function is to limit inrush currents when switching capacitors, which protects both the network and the equipment from harmful voltage spikes and disturbances. Featuring integrated precharging resistors, a wide-range AC/DC control voltage, and a compact Size S2 form factor, the 3RT2637-1NB35 offers a reliable and efficient solution for power quality and compensation applications.

Key Benefit

• Enhanced Network Stability: Limits peak charging currents of capacitive loads, minimizing negative impacts on the power supply network and reducing voltage fluctuations.
• Increased Equipment Longevity: Protects capacitors, transformers, and other connected devices from the stress of high inrush currents.
• Versatile Control: Operates on a wide 20-33 V AC/DC control voltage, making it suitable for various control circuit designs.
• Integrated Protection: Comes with an integrated varistor for surge suppression, protecting the control coil from overvoltage.
• Simple Installation: Features screw terminals for secure and straightforward wiring.
• Compact Design: The Size S2 footprint allows for efficient use of space within control panels.
• Compliance with Standards: Conforms to key international standards including IEC 60947, IEC 60831, and IEC 61921, ensuring reliability and safety.

Function

• Capacitor Switching (AC-6b): Specifically designed for switching unchoked or choked capacitors in power factor correction and reactive current compensation systems.
• Precharging Resistors: Leading auxiliary contacts engage precharging resistors before the main contacts close. This critical feature limits the inrush current, preventing damage to both the contactor and the capacitors.
• Surge Suppression: The integrated varistor protects the control circuit from voltage spikes, extending the life of the contactor’s coil.
• Auxiliary Contacts: Equipped with two normally closed (2 NC) auxiliary contacts for feedback and control circuit integration.

Technical Specification

• Product Number: 3RT2637-1NB35
• Product Type: Capacitor Contactor
• Application: AC-6b
• Rated Power (Capacitor): 75 kVAr at 400 V
• Number of Poles: 3-pole
• Control Voltage: 20-33 V AC/DC, 50/60 Hz
• Integrated Components: Varistor
• Auxiliary Contacts: 2 NC
• Terminals: Screw terminals
• Size: S2
• Standards: IEC 60947-1, IEC 60947-4-1, IEC 60947-5-1, IEC 60831-1, IEC 61921
• Brand: Siemens SIRIUS

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