Siemens 3RT2637-1AF05 Capacitor Contactor 75 kVAr, 400V, 110V AC Coil, 2 NC Contact Original Brand New

Overview

The Siemens 3RT2637-1AF05 is a high-performance capacitor contactor specifically engineered for switching capacitive loads in reactive current compensation systems and for use with converters. This model is rated for AC-6b operation up to 75 kVAr at 400 V. A key feature is its integrated precharging resistors, which are engaged by leading auxiliary contacts.

This design effectively limits the peak charging current, minimizing negative impacts on the power supply network and ensuring reliable operation. The 3RT2637-1AF05 is a 3-pole contactor with a 110 V AC, 50 Hz control voltage, featuring two normally closed (2 NC) auxiliary contacts and secure screw terminals. Its compact S2 size makes it suitable for integration into various control panel configurations.

Key Features & Benefits

• Optimized for Capacitive Loads: Designed to handle the high inrush currents of capacitive loads (AC-6b), protecting both the equipment and the power grid.
• Integrated Precharging Resistors: The innovative design with leading auxiliary contacts and precharging resistors significantly reduces peak charging currents, improving system stability and component lifespan.
• High-Quality Construction: Built to stringent international standards (IEC 60947 series, IEC 60831-1, IEC 61921), ensuring reliability and safety.
• Versatile Application: Ideal for use in power factor correction systems, switching capacitor banks, and controlling converters.
• Convenient Wiring: Equipped with robust screw terminals for a secure and easy connection.
• Expandable Design: The basic unit can be expanded with additional lateral auxiliary switches to meet specific application requirements.

Installation & Protection

The 3RT2637-1AF05 requires appropriate protection against short circuits, overloads, and overvoltage.

• Main Connections: Refer to the technical product data sheet for information on protecting a standalone contactor. For combinations with overload relays or circuit breakers, consult the Digital or Configuration Manuals for load feeders.
• Auxiliary Connections: Protection of auxiliary contacts is detailed in the technical product data sheet.
• Control Supply: Select a suitable power supply, considering the contactor’s load characteristics (inrush current, holding power) and relevant standards.
• Overvoltage Protection: The contactor can be retrofitted with surge suppressors (RC elements, varistors, diodes) to dampen opening surges in the coil. Note that this may increase break times.

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