Siemens 3RT2625-1BF45 Capacitor Contactor 16.7 kVAr, 400V, 110V DC, Size S0 Original Brand New

Overview

The Siemens 3RT2625-1BF45 is a high-performance capacitor contactor specifically engineered for switching capacitive loads in reactive current compensation systems and for converter applications. This S0 size, 3-pole contactor is designed to handle loads up to 16.7 kVAr at 400V, providing a reliable and efficient solution for power factor correction and power quality improvement. The contactor operates with a 110V DC control voltage and features a screw terminal for secure connections.

A key feature of the 3RT2625-1BF45 is its integrated precharging resistors, which are engaged via leading auxiliary contacts. This innovative design limits the inrush current that occurs when switching capacitive loads, thereby minimizing stress on the power supply network and extending the lifespan of the connected equipment. The contactor is equipped with a total of 1 Normally Open (NO) and 2 Normally Closed (NC) auxiliary contacts, offering flexibility for control and signaling applications.

Key Benefit

• Optimized for Capacitive Loads: Specifically designed with precharging resistors to safely switch capacitors, reducing inrush current and preventing network disturbances.
• Enhanced System Reliability: Minimizes electrical stress on both the power network and connected components, leading to a more stable and reliable system.
• Versatile Application: Ideal for both choked and unchoked capacitors in reactive current compensation systems and for switching converters.
• Flexible Control: Features multiple auxiliary contacts (1 NO + 2 NC) for easy integration into complex control circuits and signaling systems.
• Robust and Secure Connections: Screw terminals ensure a solid and reliable electrical connection.
• Compliance with Global Standards: Manufactured and tested in accordance with international standards, ensuring quality, safety, and compatibility.

Function

The Siemens 3RT2625-1BF45 operates by employing a two-stage switching process. When the contactor is energized, the leading auxiliary contacts close first, engaging the precharging resistors. These resistors limit the initial high current surge as the capacitors begin to charge. Shortly after, the main contacts close, bypassing the resistors and allowing the full current to flow to the capacitors. This controlled process is crucial for managing the high peak currents associated with capacitive loads, which can otherwise cause voltage sags, equipment damage, and false tripping of protective devices.

Protection and Safety

For optimal performance and safety, proper protection measures must be implemented:

• Main Connections: Short-circuit and overload protection should be provided for the main connections. Refer to the technical product data sheet for a free-standing contactor or the Siemens Digital Configuration Manual for load feeders for guidance on device combinations.
• Auxiliary Connections: The auxiliary contacts must also be protected against short circuits and overloads. Consult the technical product data sheet for specific information.
• Control Supply: The 110V DC control circuit requires appropriate protection against short circuits and overloads. A power supply with a current-limiting function or suitable miniature circuit breakers are recommended.
• Overvoltage Protection: The control circuit can be further protected against switching surges by retrofitting with optional accessories such as RC elements, varistors, or diodes. These suppressors are available separately.

Expansion and Configuration

The 3RT2625-1BF45 includes the necessary auxiliary contacts for the precharging resistors and two additional free auxiliary contacts (1 NO + 1 NC). For applications requiring more auxiliary contacts, the product family (3RT262 contactors) allows for the mounting of a lateral auxiliary switch, offering greater configuration flexibility.

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