Siemens 3RT2627-1AC25 Capacitor Contactor 25 kVAr, 400V, 24V AC Coil, 1 NO + 2 NC Aux Contact, Size S0 Original Brand New

Overview

The Siemens 3RT2627-1AC25 is a specialized 3-pole capacitor contactor designed for switching capacitive loads up to 25 kVAr at 400 V. Engineered to meet the demanding requirements of reactive current compensation systems, this contactor is built on the robust 3RT2 platform. Its unique design features precharging resistors that are switched on via leading auxiliary contacts, effectively limiting peak charging currents and minimizing disturbances to the power supply network. This makes it an ideal solution for switching both choked and unchoked capacitors, as well as converters. The contactor includes a 24 V AC 50/60 Hz coil, a configuration of 1 NO + 2 NC auxiliary contacts, and secure screw terminals, all within a compact Size S0 frame.

Standards

The Siemens 3RT2627-1AC25 capacitor contactor adheres to the highest international standards for electrical components, ensuring reliability and safety:

• IEC 60947-1: Low-voltage switchgear and controlgear – General rules.
• IEC 60947-4-1: Contactors and motor-starters – Electromechanical contactors and motor-starters.
• IEC 60947-5-1: Control circuit devices and switching elements – Electromechanical control circuit devices.
• IEC 60831-1: Shunt power capacitors of the self-healing type for a.c. systems having a rated voltage up to and including 1000 V – General.
• IEC 61921: Power capacitors – Low-voltage power factor correction banks.

Function

The 3RT2627-1AC25’s primary function is to safely and reliably switch capacitive loads in compliance with the AC-6b utilization category. Its integrated precharging resistors, activated by dedicated leading auxiliary contacts, are crucial for limiting the high inrush currents typical of capacitor switching. This process prevents voltage sags, harmonics, and other negative impacts on the electrical grid, prolonging the life of both the contactor and the capacitors. The design ensures a smooth and controlled connection of the load, making it perfect for power factor correction applications and switching converters.

Benefit

• Minimized Grid Disturbances: The innovative precharging resistor technology significantly reduces inrush currents, protecting the power supply network from harmful transients and voltage fluctuations.
• Extended Equipment Lifespan: By limiting electrical stress on the capacitors and the contactor itself, this device enhances the longevity and reliability of your entire reactive power compensation system.
• High Performance and Safety: Built to rigorous IEC standards, the contactor guarantees dependable operation and a high level of safety in industrial environments.
• Flexible Integration: The screw terminals and Size S0 form factor allow for easy and secure installation into existing control panels and systems.
• Comprehensive Monitoring: The 1 NO + 2 NC auxiliary contact configuration provides flexible options for monitoring the contactor’s status and integrating it into control circuits.

Protection and Expansion

• Short-circuit and Overload Protection: The contactor requires external protection for its main, auxiliary, and control supply connections. For detailed guidance on proper short-circuit and overload protection, consult the product’s technical data sheet or the Siemens Digital Configuration Manuals for load feeders.
• Overvoltage Protection: The 3RT2627-1AC25 can be retrofitted with optional surge suppressors (RC elements, varistors, or diodes) to dampen opening surges in the coil, further protecting the control circuit.
• Auxiliary Contacts: The basic unit comes equipped with its integrated auxiliary contacts for the precharging resistors and two additional free auxiliary contacts (1 NO + 1 NC), allowing for direct integration into your control logic.

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