Siemens 3RT2625-1AF05 Capacitor Contactor AC-6b 16.7 kVAr, 400V, 3-pole, 110V AC Coil, Screw Terminal, Size S0 Original Brand New

Overview

The Siemens 3RT2625-1AF05 is a high-performance capacitor contactor from the trusted Siemens Sirius 3RT2 series. Specifically engineered for switching capacitive loads (AC-6b), this contactor is the ideal solution for reactive current compensation systems and applications involving the switching of converters.

Its unique design incorporates precharging resistors and leading auxiliary contacts to effectively limit the peak charging current of capacitors, minimizing negative impacts on your power supply network and ensuring reliable operation. This model is rated for up to 16.7 kVAr at 400V and features a 110V AC, 50 Hz coil.

Key Benefits

• Optimized for Capacitive Loads: Designed to handle the unique demands of switching capacitors, ensuring smooth and reliable operation in reactive power compensation systems.
• Reduced Network Impact: Integrated precharging resistors and leading auxiliary contacts effectively limit inrush currents, protecting your equipment and stabilizing the power supply.
• Enhanced Durability: Built to Siemens’ high standards, this contactor offers a long service life even under demanding conditions.
• Flexible Integration: The size S0 form factor and screw terminals make it easy to integrate into existing control panels and electrical systems.
• Comprehensive Protection: The product is designed to be easily protected against short-circuit, overload, and overvoltage when combined with appropriate protection devices.

Function & Features

The 3RT2625-1AF05 contactor’s core functionality is its ability to safely and efficiently switch capacitive loads. It achieves this through a clever mechanism:

1. Leading Auxiliary Contacts: Before the main power contacts close, special leading auxiliary contacts engage, connecting precharging resistors.
2. Precharging Resistors: These resistors absorb the initial high inrush current from the capacitors, limiting the charging peak.
3. Main Contacts: After a short delay, the main contacts close, bypassing the resistors and providing full current to the capacitor bank.

This sequence ensures a soft switch-on, protecting the contactor, the capacitors, and the power grid from stress. The integrated auxiliary contacts (1 NO + 2 NC) provide status feedback and can be used for control circuit interlocking.

Standards

The Siemens 3RT2625-1AF05 meets the following international standards, ensuring quality and safety:

• IEC 60947-1
• IEC 60947-4-1
• IEC 60947-5-1
• IEC 60831-1
• IEC 61921

Application

This product is an essential component for:

• Power Factor Correction (PFC) Systems: Switching capacitor banks to improve power quality and reduce energy costs.
• Reactive Power Compensation: Compensating for reactive power in industrial and commercial installations.
• Converter Control: Switching converters and other capacitive loads.

Installation & Protection

For short-circuit and overload protection, consult the product’s technical data sheet and the Siemens Digital Configuration Manuals for load feeders to select the appropriate circuit breakers or fuses. Overvoltage protection can be added using accessory surge suppressors (RC elements, varistors, or diodes), which are sold separately.

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