Siemens 3RT2625-1AC25 Capacitor Contactor 16.7 kVAr, 400V, 3-Pole, 24V AC Original Brand New

Overview

The Siemens 3RT2625-1AC25 is a high-performance capacitor contactor designed specifically for switching capacitive loads in reactive current compensation systems. As a specialized version of the SIRIUS 3RT2 series, this contactor is engineered to handle AC-6b switching duties up to 16.7 kVAr at 400V. Its unique design features precharging resistors that engage via leading auxiliary contacts, effectively limiting peak charging currents and minimizing disturbances to the power supply network. This makes the 3RT2625-1AC25 ideal for switching both choked and unchoked capacitors, as well as converters.

Key Features

• Capacitor Switching (AC-6b): Optimized for switching capacitive loads up to 16.7 kVAr / 400 V, ensuring reliable and safe operation.
• Integrated Precharging Resistors: Leading auxiliary contacts switch in precharging resistors before the main contacts close, drastically limiting inrush currents and extending the service life of the equipment.
• 3-Pole Design: Robust 3-pole construction for efficient power switching.
• Control Voltage: Operates with a 24 V AC control supply voltage, compatible with 50/60 Hz frequencies.
• Auxiliary Contacts: Features a configuration of 1 Normally Open (NO) and 2 Normally Closed (NC) auxiliary contacts for enhanced control and signaling.
• Screw Terminals: Equipped with secure and reliable screw terminals for easy and robust wiring.
• Compact Size S0: Space-saving design with a compact S0 size, perfect for integration into control panels with limited space.
• Standards Compliance: Adheres to international standards including IEC 60947-1, IEC 60947-4-1, IEC 60947-5-1, IEC 60831-1, and IEC 61921.

Benefit

• Extended Equipment Life: By limiting peak charging currents, the 3RT2625-1AC25 reduces stress on capacitors and other components in the system, prolonging their operational life.
• Improved Power Quality: Minimizes negative impacts on the power supply network by preventing voltage sags and surges associated with high inrush currents.
• Reliable Performance: Engineered for demanding AC-6b applications, ensuring consistent and reliable switching of capacitive loads.
• Ease of Installation: Screw terminals and a compact design simplify mounting and wiring processes.
• Versatile Application: Suitable for a wide range of applications, including reactive current compensation systems and converter switching.

Function

The 3RT2625-1AC25 contactor’s core function is to switch capacitive loads in a controlled and safe manner. When the contactor is energized, leading auxiliary contacts close first, connecting precharging resistors to the circuit. These resistors absorb the initial high inrush current as the capacitors begin to charge. A few milliseconds later, the main contacts close, bypassing the resistors and establishing a direct connection, thereby enabling the full current to flow. This two-stage process prevents the destructive effects of high inrush currents, a common issue in capacitor switching.

Technical Specification

• Product Number: 3RT2625-1AC25
• Product Type: Capacitor Contactor
• Rated Power (AC-6b): 16.7 kVAr at 400 V
• Poles: 3-pole
• Control Voltage: 24 V AC, 50/60 Hz
• Auxiliary Contacts: 1 NO + 2 NC
• Terminals: Screw Terminals
• Size: S0

Protection and Safety

For optimal performance and safety, all connections must be protected against short circuits, overloads, and overvoltage. Refer to the technical product data sheet for specific protection recommendations. The contactor coil can be protected against overvoltage surges with optional surge suppressors (RC elements, varistors, etc.), which are available as separate accessories.

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