Siemens 3RT2626-1AF05 SIRIUS Capacitor Contactor, S0, 20 kVAr, 110V AC Coil Original Brand New

Overview

The Siemens 3RT2626-1AF05 is a high-performance SIRIUS capacitor contactor designed for switching capacitive loads in reactive power compensation systems. This specialized contactor, part of the 3RT26 series, is engineered to handle the challenges of switching capacitors up to 20 kVAr at 400V. It features integrated precharging resistors and leading auxiliary contacts to limit inrush currents, thereby protecting your equipment and stabilizing the power supply. With its compact S0 size and robust design, the 3RT2626-1AF05 offers a reliable and efficient solution for various industrial applications.

Key Features & Benefits

• Optimized for Capacitive Loads: Specifically designed for AC-6b applications, the 3RT2626-1AF05 effectively switches capacitive loads, such as those found in power factor correction systems.
• Integrated Precharging Resistors: Leading auxiliary contacts engage precharging resistors before the main contacts close. This limits the high peak charging current of capacitors, minimizing stress on the network and connected equipment.
• Enhanced System Protection: By controlling inrush current, the contactor helps prevent negative impacts on the power supply, extending the lifespan of capacitors and other components.
• Reliable Performance: Built to IEC standards (IEC 60947-1, IEC 60947-4-1, etc.), this contactor ensures safe and dependable operation in demanding industrial environments.
• Flexible Auxiliary Contacts: Equipped with a 1 NO + 2 NC auxiliary contact configuration, it provides versatility for control and signaling purposes within your system.
• Easy Installation: Featuring a S0 size and user-friendly screw terminals, the 3RT2626-1AF05 is straightforward to install and integrate into existing control panels.
• Versatile Applications: Ideal for switching both choked and unchoked capacitors in reactive current compensation systems and for use with converters.

Function

The Siemens 3RT26 contactors are special versions of the 3RT2 series, engineered for the specific requirements of switching capacitive loads. The 3RT2626-1AF05 operates by utilizing a clever mechanism where precharging resistors are briefly switched into the circuit via leading auxiliary contacts. This occurs microseconds before the main contacts close. By doing so, the initial high-current surge (inrush current) that is characteristic of charging a capacitor is effectively dampened. This process significantly reduces electrical stress on both the capacitor and the power grid, leading to improved system stability and a longer service life for your components. Once the capacitor is charged, the main contacts close, bypassing the resistors and allowing for continuous operation.

Protection & Standards

• Standards: Complies with key international standards including IEC 60947-1, IEC 60947-4-1, IEC 60947-5-1, IEC 60831-1, and IEC 61921.
• Short-Circuit & Overload Protection: All connections (main, auxiliary, and control) must be protected with suitable measures. Refer to the technical product data sheet and configuration manuals for detailed guidance on selecting appropriate circuit breakers, fuses, and overload relays.
• Overvoltage Protection: The contactor coil can be retrofitted with surge suppressors (RC elements, varistors, etc.) to dampen opening surges. These accessories must be ordered separately.

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